For pricing, delivery, and ordering information, please contact /Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at _______________General DescriptionThe MAX1482 and MAX1483 are low-power trans-ceivers for RS-485 and RS-422 communication. Bothfeature slew-rate-limited drivers that minimize EMI andreduce reflections caused by improperly terminatedcables. Data rates are guaranteed up to 250kbps.The MAX1482/MAX1483 draw only 20µA of supply cur-rent. Additionally, they have a low-current shutdownmode that consumes only 0.1µA. Both parts operatefrom a single +5V supply.Drivers are short-circuit current limited and are protect-ed against excessive power dissipation by thermalshutdown circuitry that places the driver outputs into ahigh-impedance state. The receiver input has a fail-safefeature that guarantees a logic-high output if the inputis open circuit.The MAX1482 is full duplex and the MAX1483 is halfduplex. Both parts have a 1⁄8-unit-load input impedancethat guarantees up to 256 transceivers on the bus.________________________ApplicationsLow-Power RS-485/RS-422 NetworksTransceivers for EMI-Sensitive ApplicationsIndustrial-Control Local Area NetworksLarge 256-Node LANs ____________________________Features♦Low 20µA Operating Current♦Slew-Rate Limited for Reduced EMI andReduced Reflections♦0.1µA Low-Current Shutdown Mode♦Designed for RS-485 and RS-422 Applications♦Operate from a Single +5V Supply♦-7V to +12V Common-Mode Input Voltage Range♦Allows up to 256 Transceivers on the Bus—Guaranteed (1⁄8-unit load)♦Current Limiting and Thermal Shutdown forDriver Overload ProtectionMAX1482/MAX1483________________________________________________________________ Integrated Products 1TOP VIEW12348765VCCBAGND DIDERERODIP/SORD12348765VCCAGND DEREBROµMAXDIMAX1483_________________Pin ConfigurationsMAX1483NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH. TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.123485VCC+5VGND DIDERERORDRtRt76DRDEREDIROABBA_________Typical Operating CircuitsMAX1482 appears at end of data sheet.MAX1482 appears at end of data sheet.PARTTEMP RANGEPIN-PACKAGEPKGCODEMAX1482CPD0°C to +70°C14 PDIPP14-3MAX1482CSD0°C to +70°C14 SOS14-4MAX1482EPD-40°C to +85°C14 PDIPP14-3MAX1482ESD-40°C to +85°C14 SOS14-4MAX1483CPA0°C to +70°C8 PDIPP8-1MAX1483CSA0°C to +70°C8 SOS8-5MAX1483CUA0°C to +70°C8 µMAX®U8-1MAX1483EPA-40°C to +85°C8 PDIPP8-1MAX1483ESA-40°C to +85°C8 SOS8-5Ordering InformationµMAX is a registered trademark of Integrated products, Inc.找MEMORY、二三极管上美光存储 MAX1482/MAX1483Line Length vs. Data RateThe RS-485/RS-422 standard covers line lengths up to4000 feet. For line lengths greater than 4000 feet, seeFigure 16.Figure 13 shows the system differential voltage for theparts driving 4000 feet of 26AWG twisted-pair wire at110kHz into 120Ωloads. Even after 4000 feet of cable,the MAX1482/MAX1483 output shows virtually no dis-tortion.Typical ApplicationsThe MAX1482/MAX1483 transceivers are designed forbidirectional data communications on multipoint bustransmission lines. Figures 14 and 15 show typical net-work applications circuits. These parts can also beused as line repeaters, with cable lengths longer than4000 feet, as shown in Figure 16.To minimize reflections, the line should be terminated atboth ends in its characteristic impedance, and stublengths off the main line should be kept as short aspossible (although the slew-rate-limited MAX1482 andMAX1483 are more tolerant of imperfect terminationthan standard RS-485 ICs).Isolated RS-485For isolated RS-485 applications, see the MAX253 andMAX1480 data sheets.20µA, 1⁄8-Unit-Load, Slew-Rate-LimitedRS-485 Transceivers10______________________________________________________________________________________DIRODEREABRERERERORORODIDIDIDEDEDEDDDRRRBBBAAA120Ω120ΩDRMAX1483Figure 14. MAX1483 Typical Half-Duplex RS-485 NetworkRODIRECEIVERINPUTVY-VZ2µs/div5010-150Figure 13. System Differential Voltage at 250kbps (125kHz)Driving 4000 Feet of Cable
BF591中文资料
DATA SHEET
Product speci?cation
Supersedes data of September 1994
File under Discrete Semiconductors, SC041997Jul02
DISCRETE SEMICONDUCTORS BF591; BF593
NPN high-voltage transistors
M3D067
NPN high-voltage transistors BF591; BF593
FEATURES
Low current (max. 150mA)
High voltage (max. 210V).
APPLICATIONS
Telephone systems.
DESCRIPTION
NPN high-voltage transistor in a TO-202; SOT128B plastic
package.PINNING
PIN DESCRIPTION
1emitter
2collector, connected to mounting base
3base
Fig.1Simplified outline (TO-202; SOT128B)
and symbol.
handbook, halfpage
2
1
3
MAM305
123 QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN.MAX.UNIT V CBO
collector-base voltage open emitter
BF591?210V
BF593?250V
V CEO collector-emitter voltage open base
BF591?170V
BF593?210V
I CM peak collector current?300mA
P tot total power dissipation T amb≤55°C? 1.3W
SN54390, SN54LS390, SN54393, SN54LS393
SN74390, SN74LS390, SN74393, SN74LS393
DUAL 4-BIT DECADE AND BINARY COUNTERS
SDLS107 – OCTOBER 1976 – REVISED MARCH 1988
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265Copyright © 1988, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.元器件交易网SN54390, SN54LS390, SN54393, SN54LS393
SN74390, SN74LS390, SN74393, SN74LS393
DUAL 4-BIT DECADE AND BINARY COUNTERS
SDLS107 – OCTOBER 1976 – REVISED MARCH 1988
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265元器件交易网SN54390, SN54LS390, SN54393, SN54LS393
SN74390, SN74LS390, SN74393, SN74LS393
DUAL 4-BIT DECADE AND BINARY COUNTERS
MAX3042BESE中⽂资料
General Description
The MAX3040–MAX3045 is a family of 5V quad RS-485/RS-422 transmitters designed for digital data trans-mission overtwisted-pair balanced lines. All transmitter outputs are protected to ±10kV using the Human Body Model. In addition theMAX3040–MAX3045 withstand ±4kV per IEC 1000-4-4 Electrical Fast Transient/Burst Stressing. The MAX3040/MAX3043(250kbps) and the MAX3041/MAX3044 (2.5Mbps) are slew-rate limited transmitters that minimize EMI and reduce reflectionscaused by improperly terminated cables, thus allowing error-free transmission.
The MAX3040–MAX3045 feature a hot-swap capability*that eliminates false transitions on the data cable during power-up orhot insertion. The MAX3042B/MAX3045B are optimized for data transfer rates up to 20Mbps, the MAX3041/MAX3044 fordata rates up to 2.5Mbps, and the MAX3040/MAX3043 for data rates up to 250kbps.The MAX3040–MAX3045 offer optimumperformance when used with the MAX3093E or MAX3095 5V quad differential line receivers or MAX3094E/MAX3096 3Vquad differential line receivers.
