MAX3221IPWR中文资料

_______________General DescriptionThe MAX3221/MAX3223/MAX3243 achieve 1µA supply current with Maxim’s revolutionary AutoShutdown™ fea-ture. When the MAX3221/MAX3223/MAX3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off.The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system.The MAX3221/MAX3223/MAX3243 transceivers are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces intended for notebook computer applica-tions. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A guaranteed data rate of 120kbps pro-vides compatibility with popular software for communi-cating with personal computers.The MAX3221/MAX3223/MAX3243 require only 0.1µF capacitors in 3.3V operation, and can operate from input voltages ranging from +3.0V to +5.5V. They are ideal for 3.3V-only systems, mixed 3.3V and 5.0V systems, or 5.0V-only systems that require true RS-232 performance.The MAX3221 is a 1-driver/1-receiver 16-pin SSOP ver-sion of the 20-pin MAX3223 (2-driver/2-receiver). The MAX3243 3-driver/5-receiver, complete serial port is ideal for notebook or subnotebook computers. The MAX3243 includes one complementary always-active receiver. This receiver can monitor an external device (such as a modem) in shutdown, without forward bias-ing the protection diodes in a UART that may have V CC completely removed.Next Generation Device Features♦For Space-Constrained Applications:MAX3228/MAX3229: +2.5V to +5.5V RS-232Transceivers in UCSP™♦For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers (MAX3246E Available in UCSP Package)♦For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.5V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers Battery-Powered Equipment Hand-Held Equipment Peripherals PrintersMAX3221/MAX3223/MAX3243*1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown________________________________________________________________Maxim Integrated Products119-0306; Rev 8; 10/03* Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.†Future product—contact factory for availability.AutoShutdown and UCSP are trademarks of Maxim Integrated Products, Inc.Pin Configurations appear at end of data sheet.Typical Operating Circuits appear at end of data sheet._____________________Selector GuideFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)...............................................................+0.3V to -7V V+ + |V-|(Note 1).................................................................+13V Input VoltagesT_IN, FORCEOFF , FORCEON, EN (MAX3223)......-0.3V to +6V R_IN...................................................................................±25V Output VoltagesT_OUT.............................................................................±13.2V R_OUT, INVALID ......................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT......................................................................Continuous Continuous Power Dissipation (T A = +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C)...........571mW 16-Pin TSSOP (derate 6.70mW/°C above +70°C).........533mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)...........640mW 20-Pin TSSOP DIP (derate 7.00mW/°C above +70°C).....559mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C)............1W 28-Pin SSOP (derate 9.52mW/°C above +70°C)...........762mW 28-Pin TSSOP (derate 8.70mW/°C above +70°C).........696mW Operating Temperature RangesMAX32_ _C_ _.......................................................0°C to +70°C MAX32_ _E_ _....................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CNote 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:C1–C4 = 0.1µF, tested at 3.3V ±10%. C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%.M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3221/MAX3223TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150500MAX3221/MAX3223SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500051015202530354005101520253035MAX3221/MAX3223SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)M A X 3223 S U P P L Y C U R R E N T (m A )M A X 3221 S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3243TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3243SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3243SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________5______________________________________________________________Pin DescriptionLapLink is a trademark of Traveling Software._______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3221/MAX3223/MAX3243’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the +3.0V to +5.5V range. The charge pumps operate in a discontinuous mode: if the output voltages are less than 5.5V, the charge pumps are enabled; if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels. They guarantee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as Laplink™).Typically, the MAX3221/MAX3223/MAX3243 can oper-ate at data rates of 235kbps. Transmitters can be paral-leled to drive multiple receivers or mice (MAX3243).Figure 1 shows a complete system connection.When FORCEOFF is driven to ground, or the Auto-Shutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance state.M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 6_______________________________________________________________________________________RS-232 ReceiversThe MAX3221/MAX3223/MAX3243’s receivers convert RS-232 signals to CMOS-logic output levels. All receivers have one inverting three-state output. In shut-down (FORCEOFF = low) or in AutoShutdown, the MAX3221/MAX3223’s receivers are active (Table 1).Driving EN high places the receiver(s) in a high-imped-ance state. The MAX3243’s receivers are high imped-ance when the part is shut down.The MAX3243 has an always-active complementary output (R2OUTB). R2OUTB is an extra output that mon-itors receiver activity while the other receivers are high impedance. This allows Ring Indicator to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals,such as UARTs (Figure 2).Figure 1. Interface Under Control of PMUFigure 2. The MAX3243 detects RS-232 activity when the UART and interface are shut down.MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________7AutoShutdownA 1µA supply current is achieved with Maxim’s new AutoShutdown feature, which operates when FORCEON is low and FORCEOFF is high. When the MAX3221/MAX3223/MAX3243 sense no valid signal levels on all receiver inputs for 30µs, the on-board power supply and drivers are shut off, reducing supply current to 1µA. This occurs if the RS-232 cable is dis-connected or the connected peripheral transmitters are turned off. The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system. When using AutoShutdown,the INVALID output is high when the device is on and low when the device is shut down. Because I NVALID indicates the receiver inputs’ condition, it can be used in any mode (Figure 3).Table 2 and Figure 3c summarize the MAX3221/MAX3223/MAX3243operating modes. FORCEON and FORCEOFF override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither control is assert-ed, the IC selects between these states automatically based on receiver input levels. Figures 3a, 3b, and 5a depict valid and invalid RS-232 receiver levels.A mouse or other system with AutoShutdown may need time to wake up. Figure 4 shows a circuit that forces the transmitters on for 100ms, allowing enough time for theFigure 3a. MAX32_ _ Entering 1µA Supply Mode via AutoShutdown*Note:If the part is in AutoShutdown mode (FORCEOFF = V CC ,FORCEON = GND), it is shut down if no valid RS-232levels are present on all receiver inputs.Figure 4. AutoShutdown with Initial Turn-On to Wake Up a Mouse or Another SystemM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 8_______________________________________________________________________________________other system to realize that the MAX3221/MAX3223/MAX3243is awake. If the other system outputs valid RS-232 signals within that time, the RS-232 ports on both systems remain enabled.When shut down, the device’s charge pumps are turned off, V+ decays to V CC , V- decays to ground, and the transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically 100µs (Figure 5b).Software-Controlled ShutdownIf direct software control is desired, INVALID can be used to indicate DTR or Ring Indicator signal. Tie FORCEOFF and FORCEON together to bypass Auto-Shutdown so the line acts like a SHDN input.___________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; either polarized or nonpolarized capacitors may be used. The charge pump requires 0.1µF capacitors for 3.3V operation. For other supply voltages, refer to Table 3 for required capacitor values.Do not use values smaller than those listed in Table 3.Increasing the capacitor values (e.g., by a factor of 2)reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4 to maintain the proper ratios (C1to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capaci-tors with a larger nominal value. The capacitor’s equiva-lent series resistance (ESR) usually rises at low temperatures and influences the amount of ripple on V+ and V-.Table 2. AutoShutdown LogicRS-232 SIGNAL PRESENT AT RECEIVER INPUTF O R C E O F F INPUTFORCEON INPUTI N V A L I D OUTPUTTRANSCEIVER STATUSYes H X H Normal OperationNo H H L Normal Operation (Forced On)No H L L Shutdown (AutoShutdown)Yes L X H Shutdown (Forced Off)NoLXLShutdown (Forced Off)Figure 5. AutoShutdown Trip LevelsMAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as the charge-pump capacitor C1.Connect bypass capacitors as close to the IC as possible.Transmitter Outputs when Exiting ShutdownFigure 6 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232levels. Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shut-down. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V. Figure 7a shows the MAX3243’s transmitter output voltage vs. current per transmitter. Figure 7b is a mouse driver test circuit.Mouse Driveability (MAX3243)The MAX3243 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with samples of ten major mouse models from six manufacturers including the leading three: Logitech (5 models), Mouse Systems, andMicrosoft. The MAX3243 successfully drove all serial mice and met their respective current and voltage requirements. Figure 7a shows the transmitter outputs under increasing load current. The MAX3243’s switching regulator ensures the transmitters will supply at least ±5V during worst-case conditions. The AutoShutdown feature does not work with a mouse, so FORCEOFF and FORCEON should be connected to V CC .High Data RatesThe MAX3221/MAX3223/MAX3243 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 8 shows a transmitter loopback test circuit. Figure 9 shows a loopback test result at 120kbps, and Figure 10 shows the same test at 235kbps. For Figure 9, all three transmitters were driv-en simultaneously at 120kbps into RS-232 loads in par-allel with 1000pF. For Figure 10, a single transmitter was driven at 235kbps, but all three transmitters were loaded with an RS-232 receiver in parallel with 1000pF.Interconnection with 3V and 5V LogicThe MAX3221/MAX3223/MAX3243 can directly inter-face with various 5V logic families, including ACT and HCT CMOS. See Table 4 for more information on possi-ble combinations of interconnections.Figure 7a. MAX3243 Transmitter Output Voltage vs. Load Current per Transmitter5V/divV CC = +3.3V C1–C4 = 0.1µF2V/divT250µs/divT1Figure 6. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 10______________________________________________________________________________________MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown______________________________________________________________________________________11Figure 10. Loopback Test Result at 235kbpsT1INR1OUTV CC = +3.3V, 235kbps C1–C4 = 0.1µFT1OUT 5V/div5V/div2µs/div5V/divM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown__________________________________________________Typical Operating CircuitsMAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown______________________________________________________________________________________13______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 14________________________________________________________________________________________________________________________________________________Pin Configurations___________________Chip InformationMAX3221TRANSISTOR COUNT: 269MAX3223TRANSISTOR COUNT: 339MAX3243TRANSISTOR COUNT: 476MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown______________________________________________________________________________________15Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown S O I C W .E P SPACKAGE OUTLINE, .300" SOIC1121-0042BREV.DOCUMENT CONTROL NO.APPROVALPROPRIETARY INFORMATION TITLE:TOP VIEWFRONT VIEWMAX 0.0120.1040.0190.2990.013INCHES0.2910.009E C DIM 0.0140.004B A1MIN0.093A 0.237.407.600.32MILLIMETERS 0.100.352.35MIN0.490.30MAX 2.650.0500.016L 0.401.270.5120.496D D MIN DIM D INCHESMAX 12.6013.00MILLIMETERS MIN MAX 20AC 0.4470.463AB 11.7511.35180.3980.413AA 10.5010.1016N MS013SIDE VIEWH 0.4190.39410.0010.65e 0.050 1.27D 0.6140.59815.202415.60AD D 0.7130.69717.702818.10AEHE NDA1BeA0∞-8∞CL1VARIATIONS:P D P N E P SMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserv____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600Package Information (continued)(The packag/packages。

General DescriptionThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24communications interface devices feature low power con-sumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-G ap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmit-ter output pins are protected to ±15kV using the Human Body Model.A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for opera-tion from a +3.3V supply. Each device guarantees opera-tion at data rates of 250kbps while maintaining RS-232output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232-compliant output levels.The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1µA shutdown mode that reduces power consumption in battery-pow-ered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1µA of supply current. The MAX3222E and MAX3232E are pin, package, and func-tionally compatible with the industry-standard MAX242and MAX232, respectively.The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shut-down mode in which all receivers remain active, while consuming only 1µA (MAX3241E/MAX3246E) or 10nA (MAX3237E).The MAX3222E, MAX3232E, and MAX3241E are avail-able in space-saving SO, SSOP, TQFN and TSSOP pack-ages. The MAX3237E is offered in an SSOP package.The MAX3246E is offered in the ultra-small 6 x 6 UCSP™package.ApplicationsBattery-Powered Equipment PrintersCell PhonesSmart Phones Cell-Phone Data Cables xDSL ModemsNotebook, Subnotebook,and Palmtop ComputersNext-Generation Device Features♦For Space-Constrained ApplicationsMAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSP ♦For Low-Voltage or Data Cable ApplicationsMAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx, RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers________________________________________________________________Maxim Integrated Products 119-1298; Rev 10; 1/06Ordering Information continued at end of data sheet.*Dice are tested at T A = +25°C, DC parameters only.**EP = Exposed paddle.Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.†Covered by U.S. Patent numbers 4,636,930; 4,679,134;4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 TransceiversABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Notes 3, 4)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..............................................................-0.3V to +6V V+ to GND (Note 1)..................................................-0.3V to +7V V- to GND (Note 1)...................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, EN , SHDN , MBAUD to GND ........................-0.3V to +6V R_IN to GND.....................................................................±25V Output Voltages T_OUT to GND...............................................................±13.2V R_OUT, R_OUTB (MAX3241E)................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T_OUT to GND.......................Continuous Continuous Power Dissipation (T A = +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C)..........571mW 16-Pin TSSOP (derate 9.4mW/°C above +70°C).......754.7mW 16-Pin TQFN (derate 20.8mW/°C above +70°C).....1666.7mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW 20-Pin TQFN (derate 21.3mW/°C above +70°C)........1702mW 20-Pin TSSOP (derate 10.9mW/°C above +70°C)........879mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 28-Pin TSSOP (derate 12.8mW/°C above +70°C)......1026mW 32-Lead Thin QFN (derate 33.3mW/°C above +70°C)..2666mW 6 x 6 UCSP (derate 12.6mW/°C above +70°C).............1010mW Operating Temperature Ranges MAX32_ _EC_ _...................................................0°C to +70°C MAX32_ _EE_ _.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C Bump Reflow Temperature (Note 2)Infrared, 15s..................................................................+200°C Vapor Phase, 20s..........................................................+215°C Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.Note 2:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the devicecan be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.Preheating is required. Hand or wave soldering is not allowed.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________3M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers4_______________________________________________________________________________________TIMING CHARACTERISTICS—MAX3237E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 3)±10%. MAX3237E: C1–C4 = 0.1µF tested at +3.3V ±5%, C1–C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =0.33µF tested at +5.0V ±10%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at 5.0V ±10%.Note 4:MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range.Note 5:The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are atthe supply rails.Note 6:MAX3241EEUI is specified at T A = +25°C.Note 7:Transmitter skew is measured at the transmitter zero crosspoints.TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246EMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________5-6-4-202460MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )10001500500200025003000531-1-3-5-6-2-42046-5-31-135010001500500200025003000LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCE-7.5-5.0-2.502.55.07.5MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )500100015002000__________________________________________Typical Operating Characteristics(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)-6-5-4-3-2-10123456010002000300040005000MAX3241ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )302010405060020001000300040005000MAX3241EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )04286121014010002000300040005000MAX3241ESLEW RATE vs. LOAD CAPACITANCEM A X 3237E t o c 05LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )-6-5-4-3-2-10123456010002000300040005000MAX3222E/MAX3232ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U TV O L T A G E (V )624108141216010002000300040005000MAX3222E/MAX3232ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs)2520155103530404520001000300040005000MAX3222E/MAX3232E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)20604080100MAX3237ETRANSMITTER SKEW vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)100015005002000T R A N S M I T T E R S K E W (n s )-6-2-42046-3-51-1352.03.03.52.54.04.55.0SUPPLY VOLTAGE (V)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (MBAUD = GND)10203040502.0MAX3237E SUPPLY CURRENT vs. SUPPLY VOLTAGE (MBAUD = GND)SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (m A )3.03.52.54.04.55.0MAX3246ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )4000300010002000-5-4-3-2-101234567-65000468101214160MAX3246ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E WR A T E (V /µs )200030001000400050001020304050600MAX3246EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCEM A X 3237E t o c 17LOAD CAPACITANCE (pF)S U P P L Y C U R R EN T (m A )1000200030004000500055453525155024681012MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )10001500500200025003000010203050406070MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )5001000150020001020304050MAX3237ESUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )10001500500200025003000MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________7Pin DescriptionM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers8_______________________________________________________________________________________MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________9Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246Es’ internal power supply consists of a regu-lated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V V CC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1).RS-232 TransmittersThe transmitters are inverting level translators that con-vert TTL/CMOS-logic levels to ±5V EIA/TIA-232-compli-ant levels.The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF,providing compatibility with PC-to-PC communication software (such as LapLink™). Transmitters can be par-alleled to drive multiple receivers or mice.The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forcedinto a high-impedance state when the device is in shut-down mode (SHDN = G ND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to ±12V in shutdown.The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V CC . The MAX3237E’s trans-mitter inputs have a 400k Ωactive positive-feedback resistor, allowing unused inputs to be left unconnected.MAX3237E MegaBaud OperationFor higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for +3.0V < V CC < +4.5V. For +5V ±10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/MAX3246E receivers have inverting three-state outputs.Drive EN high to place the receiver(s) into a high-impedance state. Receivers can be either active or inactive in shutdown (Table 1).Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers10______________________________________________________________________________________The complementary outputs on the MAX3237E/MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN . This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC drops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2).MAX3222E/MAX3237E/MAX3241E/MAX3246E Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). The MAX3237E’s supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device’s charge pumps are shut off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter out-puts are disabled (high impedance). The time required to recover from shutdown is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E).±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic dis-charges encountered during handling and assembly.The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage.The ESD structures withstand high ESD in all states:normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup.Furthermore, the MAX3237E logic I/O pins also have ±15kV ESD protection. Protecting the logic I/O pins to ±15kV makes the MAX3237E ideal for data cable applications.SHDN T2OUTT1OUT5V/div2V/divV CC = 3.3V C1–C4 = 0.1µFFigure 3. Transmitter Outputs Recovering from Shutdown or Powering UpMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 TransceiversESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the MAX3222E/MAX3232E/MAX3241E/MAX3246E are characterized for protection to the following limits:•±15kV using the Human Body Model•±8kV using the Contact Discharge method specified in IEC 1000-4-2•±9kV (MAX3246E only) using the Contact Discharge method specified in IEC 1000-4-2•±15kV using the Air-G ap Discharge method speci-fied in IEC 1000-4-2Figure 4a. Human Body ESD Test ModelFigure 4b. Human Body Model Current WaveformFigure 5a. IEC 1000-4-2 ESD Test Model Figure 5b. IEC 1000-4-2 ESD Generator Current WaveformM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceiverscharacterized for protection to ±15kV per the Human Body Model.ESD Test ConditionsESD performance depends on a variety of conditions.Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body ModelFigure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest,which is then discharged into the test device through a 1.5k Ωresistor.IEC 1000-4-2The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design equipment that meets level 4 (the highest level)of IEC 1000-4-2, without the need for additional ESD-protection components.The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. The Air-G ap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.Machine ModelThe Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis-tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just RS-232 inputs and outputs.Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.Table 2. Required Minimum Capacitor ValuesFigure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per TransmitterTable 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 TransceiversApplications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use val-ues smaller than those listed in Table 2. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1without also increasing the values of C2, C3, C4,and C BYPASS to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degradeexcessively with temperature. If in doubt, use capaci-tors with a larger nominal value. The capacitor’s equiv-alent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+and V-.Power-Supply DecouplingIn most circumstances, a 0.1µF V CC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Figure 6b. Mouse Driver Test CircuitM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 TransceiversFigure 7. Loopback Test CircuitT1IN T1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V C1–C4 = 0.1µFFigure 8. MAX3241E Loopback Test Result at 120kbps T1INT1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V, C1–C4 = 0.1µFFigure 9. MAX3241E Loopback Test Result at 250kbps+5V 0+5V 0-5V +5VT_INT_OUT5k Ω + 250pFR_OUTV CC = 3.3V C1–C4 = 0.1µFFigure 10. MAX3237E Loopback Test Result at 1000kbps (MBAUD = V CC )Transmitter Outputs Recoveringfrom ShutdownFigure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3k Ωin parallel with 2500pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note thatthe transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.Mouse DrivabilityThe MAX3241E is designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manu-facturers such as Microsoft and Logitech. The MAX3241E successfully drove all serial mice tested and met their current and voltage requirements.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 TransceiversFigure 6a shows the transmitter output voltages under increasing load current at +3.0V. Figure 6b shows a typical mouse connection using the MAX3241E.High Data RatesThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E maintain the RS-232 ±5V minimum transmit-ter output voltage even at high data rates. Figure 7shows a transmitter loopback test circuit. Figure 8shows a loopback test result at 120kbps, and Figure 9shows the same test at 250kbps. For Figure 8, all trans-mitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237E maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 10 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 10, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.Interconnection with 3V and 5V LogicThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3for more information on possible combinations of inter-connections.UCSP ReliabilityThe UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and usage environ-ment. The user should closely review these areas when considering use of a UCSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as the wafer-fabrication process primarily determines it.Mechanical stress performance is a greater considera-tion for a UCSP package. UCSPs are attached through direct solder contact to the user’s PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be consid-ered. Table 4 shows the testing done to characterize the UCSP reliability performance. In conclusion, the UCSP is capable of performing reliably through envi-ronmental stresses as indicated by the results in the table. Additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website at .Table 4. Reliability Test DataM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers__________________________________________________________Pin ConfigurationsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 TransceiversPin Configurations (continued)。

Figure 2. The MAX3243 Detects RS-232 Activity When the UART and Interface Are Shut Down.MAX3221/MAX3223/MAX3243+3V to +5.5V RS-232Transceivers with AutoShutdown Figure 1. Interface Under Control of PMURS-232 ReceiversThe MAX3221/MAX3223/MAX3243’s receivers convertRS-232 signals to CMOS-logic output levels. All receiv-ers have one inverting three-state output. In shutdown(FORCEOFF = low) or in AutoShutdown, the MAX3221/MAX3223’s receivers are active (Table 1). Driving EN highplaces the receiver(s) in a high-impedance state. TheMAX3243’s receivers are high impedance when the partis shut down.The MAX3243 has an always-active complementaryoutput (R2OUTB). R2OUTB is an extra output thatmonitors receiver activity while the other receiversare high impedance. This allows Ring Indicator to bemonitored without forward biasing other devicesconnected to the receiver outputs. This is ideal forsystems where V CC is set to 0V in shutdown toaccommodate peripherals, such as UARTs (Figure 2).Integrated │ 6Figure 8. Loopback Test CircuitFigure 9. Loopback Test Result at 120kbps Figure 10. Loopback Test Result at 235kbpsTable 3. Required Capacitor Values Table 4. Logic Family Compatibility with Various Supply Voltages V CC (V)C1 (μF)C2, C3, C4 (μF)3.0 to 3.60.10.14.5 to 5.50.0470.333.0 to 5.50.10.47SYSTEM POWER-SUPPLY VOLTAGE (V) V CC SUPPLY VOLTAGE (V)COMPATIBILITY 3.3 3.3Compatible with all CMOS families.55Compatible with all TTL and CMOS-logic families.5 3.3Compatible with ACT and HCT CMOS, and with TTL. Incompatible with AC, HC, or CD4000 CMOS.T1IN R1OUT V CC = +3.3V, 120kbpsC1–C4 = 0.1µFT1OUT 5V/div5V/div5V/div5µs/divT1IN R1OUT V CC = +3.3V, 235kbps C1–C4 = 0.1µF T1OUT 5V/div 5V/div 2µs/div 5V/div MAX3221/MAX3223/MAX3243+3V to +5.5V RS-232Transceivers with AutoShutdown Integrated │ 11。

________________General DescriptionThe MAX3222/MAX3232/MAX3237/MAX3241 trans-ceivers have a proprietary low-dropout transmitter out-put stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232output levels.The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply cur-rent. The MAX3222 and MAX3232 are pin, package,and functionally compatible with the industry-standard MAX242 and MAX232, respectively.The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and subnotebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1µA supply current. Receivers R1(MAX3237/MAX3241) and R2 (MAX3241) have extra out-puts in addition to their standard outputs. These extra outputs are always active, allowing external devices such as a modem to be monitored without forward bias-ing the protection diodes in circuitry that may have V CC completely removed.The MAX3222, MAX3237, and MAX3241 are available in space-saving TSSOP and SSOP packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers High-Speed Modems Battery-Powered Equipment Hand-Held Equipment Peripherals Printers__Next Generation Device Features♦For Smaller Packaging:MAX3228E/MAX3229E: +2.5V to +5.5V RS-232Transceivers in UCSP™♦For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers♦For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222/MAX3232/MAX3237/MAX3241*3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07*Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.Typical Operating Circuits appear at end of data sheet.Ordering Information continued at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500_____________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors6_____________________________________________________________________________________________________________________________________________________Pin DescriptionMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________7_______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222/MAX3232/MAX3237/MAX3241’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5V, the charge pumps are enabled, and if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3222/MAX3232/MAX3241 transmitters guaran-tee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).Typically, these three devices can operate at data rates of 235kbps. Transmitters can be paralleled to drive multi-ple receivers or mice.The MAX3222/MAX3237/MAX3241’s output stage is turned off (high impedance) when the device is in shut-down mode. When the power is off, the MAX3222/MAX3232/MAX3237/MAX3241 permit the outputs to be driven up to ±12V.The transmitter inputs do not have pullup resistors.Connect unused inputs to GND or V CC .MAX3237 MegaBaud OperationIn normal operating mode (MBAUD = G ND), the MAX3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF.This provides compatibility with PC-to-PC communica-tion software, such as Laplink.For higher speed serial communications, the MAX3237features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237 transmitters guar-antee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for 3.0V < V CC < 4.5V. For 5V ±10%operation, the MAX3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software, Inc.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors8_______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic out-put levels. The MAX3222/MAX3237/MAX3241 receivers have inverting three-state outputs. In shutdown, the receivers can be active or inactive (Table 1).The complementary outputs on the MAX3237 (R1OUTB)and the MAX3241 (R1OUTB, R2OUTB) are always active,regardless of the state of EN or SHDN . This allows for Ring Indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).MAX3222/MAX3237/MAX3241Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are dis-abled (high impedance). The time required to exit shut-down is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if the shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB.MAX3222/MAX3237/MAX3241Enable ControlThe inverting receiver outputs (R_OUT) are put into a high-impedance state when EN is high. The complemen-tary outputs R1OUTB and R2OUTB are always active,regardless of the state of EN and SHDN (Table 1). EN has no effect on T_OUT.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, refer to Table 2 for required capacitor values. Do not use values lower than those listed in Table 2. Increasing the capaci-tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump-tion. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4, to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade exces-sively with temperature. If in doubt, use capacitors with a higher nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low tempera-tures, influences the amount of ripple on V+ and V-.Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237/MAX3241(b) with Previous Transceivers (a).MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Transmitter Outputs whenExiting ShutdownFigure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low).Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.Mouse DriveabilityThe MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements.Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241.CC = 3.3V C1–C4 = 0.1µF50µs/divFigure 3. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors10______________________________________________________________________________________Figure 4b. Mouse Driver Test Circuit Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per TransmitterMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________11High Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopback test circuit. Figure 6 shows a loopback test result at 120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.CC = 3.3V5µs/divFigure 5. Loopback Test CircuitFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2µs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V +5V 0V -5V +5V 0VT_INT_OUT = R_IN 5k R_OUT 150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = V CC )M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors__________________________________________________Typical Operating CircuitsInterconnection with 3V and 5V LogicThe MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 3 for more informa-tion on possible combinations of interconnections.Table 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________13_____________________________________Typical Operating Circuits (continued)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors14___________________________________________________________________________________________________________________________________Pin Configurations (continued)MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________15______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximOrdering Information (continued)*Dice are tested at T A = +25°C, DC parameters only.+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors16_________________________________________________________________________________________________________Chip Topography___________________Chip InformationT1INT2IN 0.127"(3.225mm)0.087"(2.209mm)R2OUTR2IN T2OUTV CCV+C1+SHDNENC1- C2+C2-V-MAX3222TRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GNDTransceivers Using Four 0.1µF External CapacitorsPackage Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to /packages.)Revision HistoryPages changed at Rev 7: 1, 15, 16, 17Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.17__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.。

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim's website at .General DescriptionThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24communications interface devices feature low power con-sumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-G ap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmit-ter output pins are protected to ±15kV using the Human Body Model.A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for opera-tion from a +3.3V supply. Each device guarantees opera-tion at data rates of 250kbps while maintaining RS-232output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232-compliant output levels.The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1µA shutdown mode that reduces power consumption in battery-pow-ered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1µA of supply current. The MAX3222E and MAX3232E are pin, package, and func-tionally compatible with the industry-standard MAX242and MAX232, respectively.The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shut-down mode in which all receivers remain active, while consuming only 1µA (MAX3241E/MAX3246E) or 10nA (MAX3237E).The MAX3222E, MAX3232E, and MAX3241E are avail-able in space-saving SO, SSOP, TQFN and TSSOP pack-ages. The MAX3237E is offered in an SSOP package.The MAX3246E is offered in the ultra-small 6 x 6 UCSP™package.ApplicationsBattery-Powered Equipment PrintersCell PhonesSmart Phones Cell-Phone Data Cables xDSL ModemsNotebook, Subnotebook,and Palmtop ComputersNext-Generation Device Features♦For Space-Constrained ApplicationsMAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSP ♦For Low-Voltage or Data Cable ApplicationsMAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx, RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers________________________________________________________________Maxim Integrated Products 119-1298; Rev 11; 10/07Ordering Information continued at end of data sheet.*Dice are tested at T A = +25°C, DC parameters only.**EP = Exposed paddle.Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet.MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.†Covered by U.S. Patent numbers 4,636,930; 4,679,134;4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Notes 3, 4)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..............................................................-0.3V to +6V V+ to GND (Note 1)..................................................-0.3V to +7V V- to GND (Note 1)...................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, EN , SHDN , MBAUD to GND ........................-0.3V to +6V R_IN to GND.....................................................................±25V Output Voltages T_OUT to GND...............................................................±13.2V R_OUT, R_OUTB (MAX3241E)................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T_OUT to GND.......................Continuous Continuous Power Dissipation (T A = +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C)..........571mW 16-Pin TSSOP (derate 9.4mW/°C above +70°C).......754.7mW 16-Pin TQFN (derate 20.8mW/°C above +70°C).....1666.7mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW 20-Pin TQFN (derate 21.3mW/°C above +70°C)........1702mW 20-Pin TSSOP (derate 10.9mW/°C above +70°C)........879mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 28-Pin TSSOP (derate 12.8mW/°C above +70°C)......1026mW 32-Lead Thin QFN (derate 33.3mW/°C above +70°C)..2666mW 6 x 6 UCSP (derate 12.6mW/°C above +70°C).............1010mW Operating Temperature Ranges MAX32_ _EC_ _...................................................0°C to +70°C MAX32_ _EE_ _.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C Bump Reflow Temperature (Note 2)Infrared, 15s..................................................................+200°C Vapor Phase, 20s..........................................................+215°C Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.Note 2:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the devicecan be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.Preheating is required. Hand or wave soldering is not allowed.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________3M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers4_______________________________________________________________________________________TIMING CHARACTERISTICS—MAX3237E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 3)±10%. MAX3237E: C1–C4 = 0.1µF tested at +3.3V ±5%, C1–C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =0.33µF tested at +5.0V ±10%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at 5.0V ±10%.Note 4:MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range.Note 5:The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are atthe supply rails.Note 6:MAX3241EEUI is specified at T A = +25°C.Note 7:Transmitter skew is measured at the transmitter zero crosspoints.TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246EMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________5-6-4-202460MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )10001500500200025003000531-1-3-5-6-2-42046-5-31-135010001500500200025003000LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCE-7.5-5.0-2.502.55.07.5MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )500100015002000__________________________________________Typical Operating Characteristics(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)-6-5-4-3-2-10123456010002000300040005000MAX3241ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V)302010405060020001000300040005000MAX3241EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )04286121014010002000300040005000MAX3241ESLEW RATE vs. LOAD CAPACITANCEM A X 3237E t o c 05LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )-6-5-4-3-2-10123456010002000300040005000MAX3222E/MAX3232ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P UT V O L T A G E (V )624108141216010002000300040005000MAX3222E/MAX3232ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs)2520155103530404520001000300040005000MAX3222E/MAX3232E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)20604080100MAX3237ETRANSMITTER SKEW vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)100015005002000T R A N S M I T T E R S K E W (n s )-6-2-42046-3-51-1352.03.03.52.54.04.55.0SUPPLY VOLTAGE (V)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (MBAUD = GND)10203040502.0MAX3237E SUPPLY CURRENT vs. SUPPLY VOLTAGE (MBAUD = GND)SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (m A )3.03.52.54.04.55.0MAX3246ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )4000300010002000-5-4-3-2-101234567-65000468101214160MAX3246ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L EW R A T E (V /μs )200030001000400050001020304050600MAX3246EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCEM A X 3237E t o c 17LOAD CAPACITANCE (pF)S U P P L Y C U R R EN T (m A )1000200030004000500055453525155024681012MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )10001500500200025003000010203050406070MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )5001000150020001020304050MAX3237ESUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )10001500500200025003000MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________7Pin DescriptionM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers8_______________________________________________________________________________________MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________9Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246Es’ internal power supply consists of a regu-lated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V V CC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1).RS-232 TransmittersThe transmitters are inverting level translators that con-vert TTL/CMOS-logic levels to ±5V EIA/TIA-232-compli-ant levels.The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF,providing compatibility with PC-to-PC communication software (such as LapLink™). Transmitters can be par-alleled to drive multiple receivers or mice.The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forcedinto a high-impedance state when the device is in shut-down mode (SHDN = G ND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to ±12V in shutdown.The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V CC . The MAX3237E’s trans-mitter inputs have a 400k Ωactive positive-feedback resistor, allowing unused inputs to be left unconnected.MAX3237E MegaBaud OperationFor higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for +3.0V < V CC < +4.5V. For +5V ±10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/MAX3246E receivers have inverting three-state outputs.Drive EN high to place the receiver(s) into a high-impedance state. Receivers can be either active or inactive in shutdown (Table 1).Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers10______________________________________________________________________________________The complementary outputs on the MAX3237E/MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN . This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC drops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2).MAX3222E/MAX3237E/MAX3241E/MAX3246E Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). The MAX3237E’s supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device’s charge pumps are shut off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter out-puts are disabled (high impedance). The time required to recover from shutdown is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E).±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic dis-charges encountered during handling and assembly.The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage.The ESD structures withstand high ESD in all states:normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup.Furthermore, the MAX3237E logic I/O pins also have ±15kV ESD protection. Protecting the logic I/O pins to ±15kV makes the MAX3237E ideal for data cable applications.SHDN T2OUTT1OUT5V/div2V/divV CC = 3.3V C1–C4 = 0.1μFFigure 3. Transmitter Outputs Recovering from Shutdown or Powering UpMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the MAX3222E/MAX3232E/MAX3241E/MAX3246E are characterized for protection to the following limits:•±15kV using the Human Body Model•±8kV using the Contact Discharge method specified in IEC 1000-4-2•±9kV (MAX3246E only) using the Contact Discharge method specified in IEC 1000-4-2•±15kV using the Air-G ap Discharge method speci-fied in IEC 1000-4-2Figure 4a. Human Body ESD Test ModelFigure 4b. Human Body Model Current WaveformFigure 5a. IEC 1000-4-2 ESD Test Model Figure 5b. IEC 1000-4-2 ESD Generator Current WaveformM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceiverscharacterized for protection to ±15kV per the Human Body Model.ESD Test ConditionsESD performance depends on a variety of conditions.Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body ModelFigure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest,which is then discharged into the test device through a 1.5k Ωresistor.IEC 1000-4-2The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design equipment that meets level 4 (the highest level)of IEC 1000-4-2, without the need for additional ESD-protection components.The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. The Air-G ap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.Machine ModelThe Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis-tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just RS-232 inputs and outputs.Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.Table 2. Required Minimum Capacitor ValuesFigure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per TransmitterTable 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversApplications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use val-ues smaller than those listed in Table 2. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1without also increasing the values of C2, C3, C4,and C BYPASS to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degradeexcessively with temperature. If in doubt, use capaci-tors with a larger nominal value. The capacitor’s equiv-alent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+and V-.Power-Supply DecouplingIn most circumstances, a 0.1µF V CC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Figure 6b. Mouse Driver Test CircuitM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversFigure 7. Loopback Test CircuitT1IN T1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V C1–C4 = 0.1μFFigure 8. MAX3241E Loopback Test Result at 120kbps T1INT1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V, C1–C4 = 0.1μFFigure 9. MAX3241E Loopback Test Result at 250kbps+5V 0+5V 0-5V +5VT_INT_OUT5k Ω + 250pFR_OUTV CC = 3.3V C1–C4 = 0.1μFFigure 10. MAX3237E Loopback Test Result at 1000kbps (MBAUD = V CC )Transmitter Outputs Recoveringfrom ShutdownFigure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3k Ωin parallel with 2500pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note thatthe transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.Mouse DrivabilityThe MAX3241E is designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manu-facturers such as Microsoft and Logitech. The MAX3241E successfully drove all serial mice tested and met their current and voltage requirements.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversFigure 6a shows the transmitter output voltages under increasing load current at +3.0V. Figure 6b shows a typical mouse connection using the MAX3241E.High Data RatesThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E maintain the RS-232 ±5V minimum transmit-ter output voltage even at high data rates. Figure 7shows a transmitter loopback test circuit. Figure 8shows a loopback test result at 120kbps, and Figure 9shows the same test at 250kbps. For Figure 8, all trans-mitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237E maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 10 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 10, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.Interconnection with 3V and 5V LogicThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3for more information on possible combinations of inter-connections.UCSP ReliabilityThe UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and usage environ-ment. The user should closely review these areas when considering use of a UCSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as the wafer-fabrication process primarily determines it.Mechanical stress performance is a greater considera-tion for a UCSP package. UCSPs are attached through direct solder contact to the user’s PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be consid-ered. Table 4 shows the testing done to characterize the UCSP reliability performance. In conclusion, the UCSP is capable of performing reliably through envi-ronmental stresses as indicated by the results in the table. Additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website at .Table 4. Reliability Test DataM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________________Pin ConfigurationsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversPin Configurations (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________Typical Operating CircuitsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers______________________________________________________________________________________21Selector Guide___________________Chip InformationTRANSISTOR COUNT:MAX3222E/MAX3232E: 1129MAX3237E: 2110MAX3241E: 1335MAX3246E: 842PROCESS: BICMOSOrdering Information (continued)†Requires solder temperature profile described in the AbsoluteMaximum Ratings section. UCSP Reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP Reliability Notice in the UCSP Reliability section of this datasheet for more information.**EP = Exposed paddle.。

MAX32213V至5.5V单通道RS-232线驱动器/接收器一概述1 1 特点z能满足或超过TIA/EIA-232-F和ITU v.28 标准的要求z工作电源电压为3V至5.5Vz最多可处理250 kbit/sz一个驱动器和一个接收器z低待机电流典型值为1 Az外接电容器 4 ⋅ 0.1 Fz接受5V逻辑输入电平和3.3V电源电压z可与Maxim MAX3221互换使用z可供选择的高速引脚可兼容器件(1 Mbit/s)– SNx5C3221z RS-232 总线引脚 ESD保护超过±15 kV时采用人体模型HBMz自动掉电特点可自动使驱动器失效以节约电源1 2 应用范围z电池上电手持和便携式设备z PDA和掌上个人电脑z数码相机z移动电话和无线设备1 3 描述/订购信息MAX3221包含一个线驱动器一个线接收器和一个带有±15-kV ESD保护的双电荷汞该器件可满足TIA/EIA-232-F要求并在一个异步通信控制器和串行端口连接器之间提供接口电荷汞和四个小型外接电容器可在单路3V至5.5V电源电压下工作这些器件在数据信号率达到250 kbit/s且最大的30-V/s驱动输出回转率时工作当串行端口失效时可对电压管理进行灵活的控制选择在FORCEON为低且FORCEOFF为高时自动掉电功能起作用在这种工作方式中若器件未感应到接收器输入端上的一个有效的RS-232信号则驱动器输出端被禁止若FORCEOFF置为低且EN为高则驱动器和接收器均被切断电源电流降至1 A断开串行端口或关闭外围驱动器将会导致自动掉电当FORCEON和FORCEOFF为高时自动掉电被禁止当自动掉电被使能且在接收器输入端加一个有效信号时器件被激活无效INVALID输出告知用户查看RS-232信号是否加在接收器输入端如果接收器输入端电压高于2.7 V或低于–2.7 V或在+0.3 V之间并持续少于30 s INVALID为高数据有效如果接收器输入端电压在+0.3 V之间并持续超过30 s则INVALID为低数据无效接收器输入端电平请参见图5二特性2 1 极限参数除非另有规定否则请在推荐工作温度范围内工作*电源电压范围VCC见注解1–0.3 V 至 6 V 正极输出电源电压范围V+见注解1–0.3 V 至 7V 负极输出电源电压范围V-见注解10.3 V 至 –7V 正负极电源电压差V+ - V-见注解113V 输入电压范围VI驱动器FORCEOFF FORCEON EN–0.3 V 至 6 V 接收器 –25 V 至25 V 输出电压范围VO驱动器 –13.2 V 至 13.2 V 接收器INVALID–0.3 V 至V CC + 0.3 V封装热阻抗JA 见注解2和3DB封装82°C/WPW封装108°C/W 工作结点温度T J 150°C导线温度1,6 mm (1/16英寸)10秒260°C 存储温度范围T stg –65°C 至 150°C*注强度超出所列的极限参数可能导致器件的永久性损坏这些仅仅是极限参数并不意味着在极限条件下或在任何其它超出推荐工作条件所示参数的情况下器件能有效工作延长在极限参数条件下的工作时间会影响器件的可靠性注解 1 所有电压是相对于GND而言的2 最大电压损耗为TJ(最大), JA, 和 TA函数在任何允许的周围环境温度下的最大允许电压损耗为PD = (TJ(最大) – TA)/JA在150°C最大TJ下工作会影响可靠性3 封装热阻抗根据JESD51-7计算得出三封装1211。

_______________General DescriptionThe MAX320/MAX321/MAX322 are precision, dual,SPST analog switches designed to operate from ±3V to ±8V dual supplies. The MAX320 has two normally open (NO) switches and the MAX321 has two normally closed (NC) switches. The MAX322 has one NO and one NC switch. Low power consumption (1.25mW)makes these parts ideal for battery-powered equip-ment. They offer low leakage currents (100pA max) and fast switching speeds (t ON = 150ns max, t OFF = 100ns max).The MAX320 series, powered from ±5V supplies, offers 35Ωmax on-resistance (R ON ), 2Ωmax matching between channels, and 4Ωmax R ON flatness.These switches also offer 5pC max charge injection and a minimum of 2000V ESD protection per Method 3015.7.For equivalent devices specified for single-supply oper-ation, see the MAX323/MAX324/MAX325 data sheet.For quad versions of these switches, see the MAX391/MAX392/MAX393 data sheet.________________________ApplicationsBattery-Operated Systems Sample-and-Hold Circuits Heads-Up Displays Guidance and Control Systems Audio and Video Switching Military RadiosTest Equipment Communications Systems ±5V DACs and ADCsPBX, PABX____________________________Featureso Low On-Resistance, 35Ωmax (16Ωtypical)o R ON Matching Between Channels <2Ωo R ON Flatness <4Ωo Guaranteed Charge Injection <5pC o Bipolar Supply Operation (±3V to ±8V)o Low Power Consumption, <1.25mW o Low Leakage Current Over Temperature, <2.5nA at +85°C o Fast Switching, t ON <150ns, t OFF <100ns o Guaranteed Break-Before-Make (MAX322 only)______________Ordering InformationMAX320/MAX321/MAX322Precision, Dual-Supply, SPSTAnalog Switches________________________________________________________________Maxim Integrated Products 1_____________________Pin Configurations/Functional Diagrams/Truth TablesCall toll free 1-800-998-8800 for free samples or literature.19-0350; Rev 0; 12/94* Contact factory for dice specifications.** Contact factory for availability.Voltage Referenced to V-V+................................................................(V- - 0.3V) to +17V IN_, COM_, NC_, NO_ (Note 1).........(V- - 0.3V) to (V+ + 0.3V)Continuous Current (any terminal)......................................30mA Peak Current, COM_, NO_, NC_(pulsed at 1ms, 10% duty cycle max)..............................100mA ESD per Method 3015.7..................................................>2000V Continuous Power DissipationPlastic DIP (derate 9.09mW/°C above +70°C).............727mW Narrow SO (derate 5.88mW/°C above +70°C).............471mWµMAX (derate 4.10mW/°C above +70°C).....................330mW CERDIP (derate 8.00mW/°C above +70°C)..................640mW Operating Temperature RangesMAX32_C_ _........................................................0°C to +70°C MAX32_E_ _......................................................-40°C to +85°C MAX32_MJA...................................................-55°C to +125°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°CM A X 320/M A X 321/M A X 322Precision, Dual-Supply, SPST Analog Switches 2_______________________________________________________________________________________Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.ABSOLUTE MAXIMUM RATINGSNote 1:Signals on NC_, NO_, COM_, or IN_ exceeding V+ or V- are clamped by internal diodes. Limit forward diode current tomaximum current rating.ELECTRICAL CHARACTERISTICS(V+ = +5V ±10%, V- = -5V ±10%, V INH = 3.5V, V INL = 2.5V, T A = T MIN to T MAX , unless otherwise noted.)MAX320/MAX321/MAX322Precision, Dual-Supply, SPSTAnalog Switches_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS(V+ = +5V ±10%, V- = -5V ±10%, V INH = 3.5V, V INL = 2.5V, T A = T MIN to T MAX , unless otherwise noted.)Note 2:The algebraic convention where the most negative value is a minimum and the most positive value a maximum is used in this data sheet.Note 3:Guaranteed by design.Note 4:∆R ON = ∆R ON max - ∆R ON min.Note 5:Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range.Note 6:Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25°C.Note 7:Off Isolation = 20 log 10[ V COM ⁄ (V NC or V NO )], V COM = output, V NC or V NO = input to off switch.Note 8:Between any two switches.M A X 320/M A X 321/M A X 322Precision, Dual-Supply, SPST Analog Switches 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V+ = +5V, V- = -5V, T A = +25°C, unless otherwise noted.)0.0001-556585OFF LEAKAGE CURRENT vs. TEMPERATURE10TEMPERATURE (°C)O F F L E A K A G E C U R R E N T (n A )-1552545-351051250.10.00110.011000-8-602ON-RESISTANCE vs. VOLTAGE AT COM PIN30V COM (V)R O N (Ω)-4-24682052510150-5-3-4-234ON-RESISTANCE vs. VOLTAGE AT COM PIN(OVER TEMPERATURE)30V COM (V)R O N (Ω)-11252052515100-5-1ON-RESISTANCE MATCH vs. VOLTAGE AT COM PIN (OVER TEMPERATURE)V COM (V)∆R O N (Ω)130.300.350.100.050.400.450.200.250.150.505-30.0001-556585ON LEAKAGE CURRENT vs. TEMPERATURE10TEMPERATURE (°C)O N L E A K A G E C U R R E N T (n A )-1552545-351051250.10.00110.011000-556585SUPPLY CURRENT vs. TEMPERATURE10012000TEMPERATURE (°C)I S U P P L Y (µA )2545-35-15510512580204060140-20-5CHARGE INJECTION vs. VOLTAGE AT COM PIN1500V COM (V)Q (p C )-1050-15105-10-520-4-3-21234MAX320/MAX321/MAX322Precision, Dual-Supply, SPSTAnalog Switches_______________________________________________________________________________________5__________Applications InformationLogic LevelsCalculate the logic thresholds typically as follows: V IH =(V+ - 1.5V) and V IL = (V+ - 2.5V).Power-supply consumption is minimized when IN1 and IN2 are driven with logic-high levels equal to V+ and logic-low levels well below the calculated V IL of (V+ - 2.5V). IN1and IN2 can be driven to V- without damage.Analog Signal LevelsAnalog signals that range over the entire supply voltage (V- to V+) can be switched, with very little change in on-resistance over the entire voltage range (see Typical Operating Characteristics ). All switches are bidirec-tional, so NO_, NC_, and COM_ pins can be used as either inputs or outputs.Power-Supply Sequencing and Overvoltage ProtectionDo not exceed the absolute maximum ratings, because stresses beyond the listed ratings may cause perma-nent damage to the devices.Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+, followed by V-,before applying analog signals or logic inputs, especial-ly if the analog or logic signals are not current-limited. Ifthis sequencing is not possible, and if the analog or logic inputs are not current-limited to <30mA, add two small signal diodes (D1, D2) as shown in Figure 1.Adding protection diodes reduces the analog signal range to a diode drop (about 0.7V) below V+ for D1,and a diode drop above V- for D2. Leakage is not affected by adding the diodes. On-resistance increas-es by a small amount at low supply voltages. Maximum supply voltage (V- to V+) must not exceed 17V.Adding protection diode D1 causes the logic thresh-olds to be shifted relative to the positive power-supply rail. This can be significant when low positive supply voltages (+5V or less) are used. Driving IN1 and IN2 all the way to the supply rails (i.e., to a diode drop higher than the V+ pin or a diode drop lower than the V- pin) is always acceptable.The protection diodes D1 and D2 also protect against some overvoltage situations. With the circuit of Figure 1,if the supply voltage is below the absolute maximum rating and if a fault voltage up to the absolute maximum rating is applied to an analog signal pin, no damage will result. For example, with ±5V supplies, analog sig-nals up to ±8.5V will not damage the circuit of Figure 1.If only a single fault signal is present, the fault voltage can rise to +12V or to -12V without damage._____________________Pin DescriptionFigure 1. Overvoltage Protection Using Two External Blocking DiodesM A X 320/M A X 321/M A X 322Precision, Dual-Supply, SPST Analog Switches 6_______________________________________________________________________________________Figure 4. Charge InjectionFigure 2. Switching TimeFigure 3. Break-Before-Make Interval (MAX322 only)______________________________________________Test Circuits/Timing DiagramsMAX320/MAX321/MAX322Precision, Dual-Supply, SPSTAnalog Switches_______________________________________________________________________________________7Figure 6. Crosstalk_________________________________Test Circuits/Timing Diagrams (continued)Figure 8. Channel-On CapacitanceFigure 7. Channel-Off Capacitance__Ordering Information (continued)___________________Chip Topography0.075" (1.90mm)0.055" (1.40mm)V+ IN2V-IN1COM2NO2 (MAX320) NC2 (MAX321/2)COM1NO1 (MAX320/2) NC1 (MAX321)* Contact factory for dice specifications.** Contact factory for availability.TRANSISTOR COUNT: 91SUBSTRATE CONNECTED TO V+M A X 320/M A X 321/M A X 322Precision, Dual-Supply, SPST Analog Switches________________________________________________________Package Informationimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©1994 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.。

LM2903DR TI2,500茂百兴LM2903PWR TI2,000茂百兴LM3S1601-IQC50-A2T TI1,000茂百兴LM3S1607-IQR50-A0T TI1,500茂百兴LM3S1911-IQC50-A2T TI1,000茂百兴LM3S1968-IQC50-A2T TI1,000茂百兴LM3S2793-IQC80-C3T TI1,000茂百兴LM3S2965-IQC50-A2T TI1,000茂百兴LM3S3749-IQC50-A0T TI1,000茂百兴LM3S6911-IQC50-A2T TI1,000茂百兴LM3S9B90-IQC80-C3T TI1,000茂百兴LM3S9B92-IQC80-C1TI90茂百兴LM3S9B92-IQC80-C3TI90茂百兴LM4040C50IDBZR TI3,000茂百兴LM4041C12IDCKR TI3,000茂百兴LMV321IDBVR TI3,000茂百兴LMV324IPWR TI2,000茂百兴LMV331IDCKR TI3,000茂百兴LT1013DDR TI2,500茂百兴MAX3221CDBR TI2,000茂百兴MAX3221CPWR TI2,000茂百兴MAX3221IPWR TI2,000茂百兴MAX3223ECDBR TI2,000茂百兴MAX3232CDBR TI2,000茂百兴MAX3232CPWR TI2,000茂百兴MAX3232ECDBR TI2,000茂百兴MAX3232IPWR TI2,000茂百兴MAX3238EIPWR TI2,000茂百兴MAX3243CDBR TI2,000茂百兴MAX3243CPWR TI2,000茂百兴MAX3243ECDBR TI2,000茂百兴MAX3243ECPWR TI2,000茂百兴MSC1211Y5PAGR TI1,500茂百兴MSP430F1232IPWR TI2,000茂百兴MSP430F135IPMR TI1,000茂百兴MSP430F149IPMR TI1,000茂百兴MSP430F1611IPMR TI1,000茂百兴MSP430F1612IPMR TI1,000茂百兴MSP430F169IPMR TI1,000茂百兴MSP430F2001IPWR TI2,000茂百兴MSP430F2011TPWR TI2,000茂百兴MSP430F2132IPMR TI2,000茂百兴MSP430F2232IDAR TI2,000茂百兴MSP430F2252IRHAR TI2,500茂百兴MSP430F413IPMR TI1,000茂百兴MSP430F4250IRGZR TI2,500茂百兴MSP430F5418IPNR TI1,000茂百兴ONET1101LRGER TI3,000茂百兴ONET8501PRGTR TI3,000茂百兴ONET8501VRGPR TI3,000茂百兴OPA2131UA TI2,500茂百兴OPA2132UA TI2,500茂百兴OPA2134UA TI2,500茂百兴OPA2227UA TI2,500茂百兴OPA2244EA TI2,500茂百兴OPA2277UA TI2,500茂百兴OPA2335AIDR TI2,500茂百兴OPA2343EA/2K5TI2,500茂百兴OPA2348AIDCNR TI3,000茂百兴OPA2348AIDR TI3,000茂百兴OPA2349EA/3K TI3,000茂百兴OPA2350UA TI2,500茂百兴OPA2354AIDGKR TI2,500茂百兴OPA2357AIDGSR TI2,500茂百兴OPA2364AIDGKR TI2,500茂百兴OPA2364IDGKR TI2,500茂百兴OPA277AIDRMR TI3,000茂百兴OPA277U TI2,500茂百兴OPA277UA TI2,500茂百兴OPA334AIDBVR TI3,000茂百兴OPA335AIDBVR TI3,000茂百兴OPA336N TI3,000茂百兴OPA340UA/2K5TI2,500茂百兴OPA348AIDBVR TI3,000茂百兴OPA361AIDCKR TI3,000茂百兴OPA374AIDBVR TI3,000茂百兴OPA376AIDBVR TI3,000茂百兴OPA4227UA/2K5TI2,500茂百兴OPA4340UA/2k5TI2,500茂百兴OPA846IDBVR TI3,000茂百兴PCI1510PGE TI60茂百兴PCI1520ZHK TI90茂百兴PCI2040PGE TI60茂百兴PCI2050BIPDV TI36茂百兴PCI2050BIZHK TI450茂百兴PCI2050BPDV TI360茂百兴PCI2050BZHK TI450茂百兴PCI2050IBPDV TI360茂百兴PCI2250PCM TI24茂百兴PCI8402ZHK TI90茂百兴PCI8412ZHK TI90茂百兴PCM1742KE/2K TI2,000茂百兴PCM1753DBQR TI2,000茂百兴PCM1754DBQR TI2,000茂百兴PCM1755DBQR TI2,000茂百兴PCM1808PWR TI2,000茂百兴PCM4104PFBR TI2,000茂百兴PCM4204PAPR TI1,500茂百兴PTH08T220WAZT TI250茂百兴PTH08T260WAZT TI250茂百兴REF3025AIDBZR TI3,000茂百兴REF3030AIDBZR TI3,000茂百兴REF3033AIDBZR TI3,000茂百兴SN65176BDR TI2,500茂百兴SN65220DBVR TI3,000茂百兴SN65240PWR TI2,000茂百兴SN65HVD10DR TI2,500茂百兴SN65HVD11DR TI2,500茂百兴SN65HVD230DR TI2,500茂百兴SN65HVD23DR TI2,500茂百兴SN65HVD251DR TI2,500茂百兴SN65HVD3082EDR TI2,500茂百兴SN65HVD3088EDGKR TI2,500茂百兴SN65HVD33DR TI2,500茂百兴SN65LVDS2DBVR TI3,000茂百兴SN65MLVD200ADR TI2,500茂百兴SN7406DR TI2,500茂百兴SN7407DR TI2,500茂百兴SN74ABTE16246DGGR TI2,000茂百兴SN74AC14PWR TI2,000茂百兴SN74AHC14PWR TI2,000茂百兴SN74AHC1G14DBVR TI3,000茂百兴SN74AHCT08DGVR TI2,000茂百兴SN74AHCT132DR TI2,500茂百兴SN74ALVC164245DLR TI1,000茂百兴SN74ALVCH162244GR TI2,000茂百兴SN74ALVCH162373GR TI2,000茂百兴SN74AUP1G125DCKR TI3,000茂百兴SN74AVC2T45DCUR TI3,000茂百兴SN74CB3Q3257PWR TI2,000茂百兴SN74CBTLV3125PWR TI2,000茂百兴SN74HC14DR TI2,500茂百兴SN74HC164PWR TI2,000茂百兴SN74HC165DR TI2,500茂百兴SN74HC590ADR TI2,500茂百兴SN74HCT541PWR TI2,000茂百兴SN74LV07APWR TI2,000茂百兴SN74LV08APWR TI2,000茂百兴SN74LV14APWR TI2,000茂百兴SN74LV164APWR TI2,000茂百兴SN74LV244ADWR TI2,000茂百兴SN74LV244APWR TI2,000茂百兴SN74LV32APWR TI2,000茂百兴SN74LV595APWR TI2,000茂百兴SN74LV595ARGYR TI1,000茂百兴SN74LVC04ADR TI2,500茂百兴SN74LVC04APWR TI2,000茂百兴SN74LVC08APWR TI2,000茂百兴SN74LVC125APWR TI2,000茂百兴SN74LVC138APWR TI2,000茂百兴SN74LVC14ADR TI2,500茂百兴SN74LVC14APWR TI2,000茂百兴SN74LVC16244ADLR TI1,000茂百兴SN74LVC16245ADGGR TI2,000茂百兴SN74LVC16373ADGGR TI2,000茂百兴SN74LVC1G07DCKR TI3,000茂百兴SN74LVC1G125DCKR TI3,000茂百兴SN74LVC244APWR TI2,000茂百兴SN74LVC245ADGVR TI2,000茂百兴SN74LVC245APWR TI2,000茂百兴SN74LVC2G17DBVR TI3,000茂百兴SN74LVC32APWR TI2,000茂百兴SN74LVC4245APWR TI2,000茂百兴SN74LVC8T245PWR TI2,000茂百兴SN74LVCH162244AGR TI2,000茂百兴SN74LVCH16244ADGGR TI2,000茂百兴SN74LVCH16245ADLR TI1,000茂百兴SN74LVCHR16245AGR TI2,000茂百兴SN74LVTH125PWR TI2,000茂百兴SN74LVTH162244DGGR TI2,000茂百兴SN74LVTH16244ADGGR TI2,000茂百兴SN74LVTH16244ADLR TI1,000茂百兴SN74LVTH16245ADLR TI1,000茂百兴SN74LVTH244APWR TI2,000茂百兴SN75240PWR TI2,000茂百兴SN75ALS1178NSR TI2,000茂百兴SN75LBC176ADR TI2,500茂百兴TAS1020BPFBR TI1,000茂百兴TAS5707PHPR TI1,000茂百兴TFP410PAP TI160茂百兴THS7314DR TI2,500茂百兴THS7316DR TI2,500茂百兴THS7374IPWR TI2,000茂百兴THS8134BCPHP TI250茂百兴THS8200PFP TI96茂百兴TL16C2550PFBR TI1,000茂百兴TL16C550CIPTR TI1,000茂百兴TL16C550CPTR TI1,000茂百兴TL16C550CPTR TI1,000茂百兴TL16C554AFNR TI250茂百兴TL16C554AIPNR TI1,000茂百兴TL16C554APNR TI1,000茂百兴TL16C752BPTR TI1,000茂百兴TL431AIDBVR TI3,000茂百兴TL431IDBVR TI3,000茂百兴TL7705ACDR TI2,500茂百兴TL7712ACDR TI2,500茂百兴TLC1543CDWR TI2,000茂百兴TLC2252AIDR TI2,500茂百兴TLC2252CDR TI2,500茂百兴TLC2254IDR TI2,500茂百兴TLC2262CDR TI2,500茂百兴TLC2272CDR TI2,500茂百兴TLC2274ACDR TI2,500茂百兴TLC2543CDBR TI2,000茂百兴TLC2543CDWR TI2,000茂百兴TLC25M2CDR TI2,500茂百兴TLC3548IDWR TI2,000茂百兴TLC3548IPWR TI2,000茂百兴TLC3702IDR TI2,500茂百兴TLC5510INSR TI2,000茂百兴TLC555CDR TI2,500茂百兴TLC555IDR 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TI3,000茂百兴TPS73101DBVR TI3,000茂百兴TPS73115DBVR TI3,000茂百兴TPS73130DBVR TI3,000茂百兴TPS73133DBVR TI3,000茂百兴TPS73201DBVR TI3,000茂百兴TPS73601DBVR TI3,000茂百兴TPS73601DCQR TI3,000茂百兴TPS73633DRBR TI3,000茂百兴TPS73701DCQR TI2,500茂百兴TPS73701DRBR TI3,000茂百兴TPS74401RGWR TI3,000茂百兴TPS74701DRCR TI3,000茂百兴TPS74801DRCR TI3,000茂百兴TPS75201QPWPR TI2,000茂百兴TPS76050DBVR TI3,000茂百兴TPS76301DBVR TI3,000茂百兴TPS76318DBVR TI3,000茂百兴TPS76333DBVR TI3,000茂百兴TPS76350DBVR TI3,000茂百兴TPS76633DR TI2,500茂百兴TPS76650DR TI2,500茂百兴TPS76701QPWPR TI2,000茂百兴TPS767D318PWPR TI2,000茂百兴TPS76801QDR TI2,500茂百兴TPS76933DBVR TI3,000茂百兴TPS77601PWPR TI2,000茂百兴TPS77633DR TI2,500茂百兴TPS77701PWPR TI2,000茂百兴TPS77801PWPR TI2,000茂百兴TPS78833DBVR TI3,000茂百兴TPS79101DBVR TI3,000茂百兴TPS79301DBVR TI2,500茂百兴TPS79318DBVR TI3,000茂百兴TPS793285DBVR TI3,000茂百兴TPS79328DBVR TI3,000茂百兴TPS79330DBVR TI3,000茂百兴TPS79333DBVR TI3,000茂百兴TPS79501DCQR TI2,500茂百兴TPS79533DCQR TI2,500茂百兴TPS79633DCQR TI2,500茂百兴TPS79730DCKR TI3,000茂百兴TPS79901DDCR TI3,000茂百兴TS3USB221DRCR TI3,000茂百兴TS5A3167DBVR TI3,000茂百兴TSB12LV26PZT TI90茂百兴TSB43AB22APDT TI90茂百兴TSC2003IPWR TI2,500茂百兴TSC2007IPWR TI2,000茂百兴TSC2007IYZGR TI3,000茂百兴TSC2017IYZGR TI3,000茂百兴TSC2046IPWR TI2,500茂百兴TUSB2046BIVFR TI1,000茂百兴TUSB2046BVFR TI1,000茂百兴TUSB3200ACPAHR TI1,500茂百兴TUSB3410VF TI250茂百兴TVP5150AM1PBSR TI1,000茂百兴TVP5154APNPR TI1,000茂百兴TVP5158IPNPR TI1,000茂百兴TVP5158PNPR TI1,000茂百兴UC2637DWTR TI2,000茂百兴UC2825ADWTR TI2,000茂百兴UC2842AD8TR TI2,500茂百兴UC2843AD8TR TI2,500茂百兴UC2844AD8TR TI2,500茂百兴UC3637DWTR TI2,000茂百兴UC3825ADWTR TI2,000茂百兴UC3843AD8TR TI2,500茂百兴UC3845AD8TR TI2,500茂百兴UC3845AN TI50茂百兴UC3846DWTR TI2,000茂百兴UC3846N TI25茂百兴UC3854AN TI25茂百兴UC3854BDWTR TI2,000茂百兴UC3854N TI25茂百兴UC3902DTR TI2,500茂百兴UCC27223PWPR TI2,000茂百兴UCC27324DGNR TI2,500茂百兴UCC27324DR TI2,500茂百兴UCC27423DR TI2,500茂百兴UCC27424DR TI2,500茂百兴UCC2800DTR TI2,500茂百兴UCC28060DR TI2,500茂百兴UCC28061DR TI2,500茂百兴UCC28070PWR TI2,000茂百兴UCC2808APWTR-2TI2,000茂百兴UCC2809DTR-1TI2,500茂百兴UCC2809PTR-1TI2,500茂百兴UCC2818DTR TI2,500茂百兴UCC28600DR TI2,500茂百兴UCC2891PWR TI2,000茂百兴UCC2894DR TI2,500茂百兴UCC2895DWTR TI2,000茂百兴UCC2897APWR TI2,000茂百兴UCC28C43DR TI2,500茂百兴UCC28C44DR TI2,500茂百兴UCC28C45DR TI2,500茂百兴UCC37324DGNR TI2,500茂百兴UCC3801DTR TI2,500茂百兴UCC3807DTR-3TI2,500茂百兴UCC3808DTR-2TI2,500茂百兴UCC3818PWTR TI2,000茂百兴UCC3895DWTR TI2,000茂百兴UCC3895PWTR TI2,000茂百兴UCC3919DTR TI2,500茂百兴UCC3946DTR TI2,500茂百兴ULN2003ADR TI2,500茂百兴ULN2003AIDR TI2,500茂百兴ULN2003AN TI25茂百兴XIO1100GGB TI160茂百兴XTR116UA/2K5TI2,500茂百兴。

MAX323精密,单电源,SPST模拟开关。

（Precision, Single-Supply,SPST Analog Switches）这些是我用有道翻译的，中英文我全部写出吧General DescriptionThe MAX323/MAX324/MAX325 are precision, dual,SPST analog switches. They are single-supply devicesdesigned to operate from +2.7V to +16V. The MAX323has two normally open (NO) switches, and the MAX324has two normally closed (NC) switches. The MAX325has one NO and one NC switch. Low power consumption(5μW) makes these parts ideal for battery-poweredequipment. These switches offer low leakage currents(100pA max) and fast switching speeds (tON = 150nsmax, tOFF = 100ns max).When powered from a 5V supply, the MAX323 seriesoffers 2½ max matching between channels, 60½ maxon-resistance, and 6½ max RON flatness.These switches also offer 5pC max charge injection,and a minimum of 2000V ESD per Method 3015.7.For equivalent devices specified for dual-supply operation,see the MAX320/MAX321/MAX322 data sheet. Forquad versions of the MAX320 series, see MAX391/MAX392/MAX393 data sheet.总体描述MAX323 / MAX324 / MAX325的精度,是二元性的,SPST模拟转换器。

MAX3222E/MAX3232E/MAX3237E/MAX3241E†/ MAX3246E的中文芯片手册±15kV ESD保护，电流低至10nA，3.0V至5.5V，高达1Mbps，的RS-232收发器概述该MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E +3.0 V供电EIA/TIA-232和V.28/V.24通信接口器件具有低功耗，高数据速率的能力，以及增强的静电放电（ESD）保护。

增强型ESD结构保护所有发送器输出和接收器输入采用IEC 1000-4-2气隙放电，±8kV使用IEC 1000-4-2接触放电（MAX3246E为±9kV ），±15kV使用人体模型。

基于上述标准，MAX3237E的逻辑和接收I / O 引脚将被保护，而发射机输出引脚的保护利用人体模型±15kV的。

一个专有的低压差发送器输出级可以提供+3.0 V至+5.5 V电源真正的RS -232性能，利用内部双电荷泵。

充电泵仅需要四个工作在+3.3 V电源的0.1μF的小电容。

每款器件保证工作在250kbps数据速率下维持RS - 232输出电平。

该MAX3237E保证操作在250kbps在正常工作模式和1Mbps的中MegaBaud™工作模式，同时保持RS- 232兼容的输出电平。

MAX3222E/MAX3232E包括两个接收器和两个发射器。

MAX3222E具有1μA关断模式，可降低功耗的电池供电的便携式系统。

该MAX3222E接收器仍活跃在关断模式下，允许监控外部设备的同时仅需耗电1μA供应电流。

TheMAX3222E和MAX3232E的引脚，封装，并与业界标准的MAX242和MAX232，分别为功能兼容。

该MAX3241E/MAX3246E是专为笔记本电脑和小型笔记本电脑设计完整串口（3个驱动器/5个接收器）。

该MAX3237E（5驱动器/ 三个接收器），非常适合那些需要快速数据传输的外围设备。