MEMORY存储芯片MAX488ESA+T中文规格书

ABSOLUTE MAXIMUM RATINGSSupply VoltageV+ to GND...............................................................-0.3V, 17VEXT, CS, REF, SHDN, FB to GND...................-0.3V, (V+ + 0.3V)GND to AGND.............................................................0.1V, -0.1VContinuous Power Dissipation (TA= +70°C)Plastic DIP (derate 9.09mW/°C above +70°C)............727mWSO (derate 5.88mW/°C above +70°C).........................471mWCERDIP (derate 8.00mW/°C above +70°C).................640mWOperating Temperature RangesMAX1771C_A.....................................................0°C to +70°CMAX1771E_A..................................................-40°C to +85°CMAX1771MJA................................................-55°C to +125°CJunction TemperaturesMAX1771C_A/E_A.......................................................+150°CMAX1771MJA..............................................................+175°CStorage Temperature Range.............................-65°C to +160°CLead Temperature (soldering, 10sec).............................+300°CStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.ELECTRICAL CHARACTERISTICS(V+ = 5V, ILOAD= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)PARAMETER

±15kV ESD-Protected, Slew-Rate-Limited,Low-Power, RS-485/RS-422 Transceivers

05101520253035404550OUTPUT CURRENT vs.RECEIVER OUTPUT LOW VOLTAGEMAX481E-01OUTPUT LOW VOLTAGE (V)OUTPUT CURRENT (mA)1.52.02.51.00.5000.10.20.30.40.50.60.70.80.9-60-2060RECEIVER OUTPUT LOW VOLTAGEvs. TEMPERATUREMAX481E-04TEMPERATURE (°C)OUTPUT LOW VOLTAGE (V)20100-4040080IRO = 8mA0-5-10-15-20-251.53.0OUTPUT CURRENT vs.RECEIVER OUTPUT HIGH VOLTAGEMAX481E-02OUTPUT HIGH VOLTAGE (V)OUTPUT CURRENT (mA)5.04.54.02.02.53.53.03.23.43.63.84.04.24.44.64.8-60-2060RECEIVER OUTPUT HIGH VOLTAGEvs. TEMPERATUREMAX481E-03TEMPERATURE (°C)OUTPUT HIGH VOLTAGE (V)20100-4040080IRO = 8mA

0102030405060708090DRIVER OUTPUT CURRENT vs.DIFFERENTIAL OUTPUT VOLTAGEMAX481E-05DIFFERENTIAL OUTPUT VOLTAGE (V)OUTPUT CURRENT (mA)1.52.0

2.5

3.03.54.04.51.00.50__________________________________________Typical Operating Characteristics(VCC= 5V, TA= +25°C, unless otherwise noted.)NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICSNote 1:All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified.Note 2:All typical specifications are given for VCC= 5V and TA= +25°C.Note 3:Supply current specification is valid for loaded transmitters when DE = 0V.Note 4:Applies to peak current. See Typical Operating Characteristics.Note 5:The MAX481E/MAX483E/MAX487E are put into shutdown by bringing–R—E–high and DE low. If the inputs are in this state forless than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts areguaranteed to have entered shutdown. See Low-Power Shutdown Modesection.MAX481E/MAX483E/MAX485E/ MAX487E–MAX491E/MAX1487E

±15kV ESD-Protected, Slew-Rate-Limited,Low-Power, RS-485/RS-422 Transceivers__________Function Tables (MAX481E/MAX483E/MAX485E/MAX487E/MAX1487E)Table 1. TransmittingTable 2. ReceivingINPUTSOUTPUTREDEA-BRO00010000>+0.2V< -0.2VInputs openX101High-Z*X = Don't careHigh-Z = High impedance*Shutdown mode for MAX481E/MAX483E/MAX487EINPUTSOUTPUTSREDEDIZYXX01110010XX01High-ZHigh-Z*10High-ZHigh-Z*X = Don't careHigh-Z = High impedance*Shutdown mode for MAX481E/MAX483E/MAX487E

__________Applications InformationThe MAX481E/MAX483E/MAX485E/MAX487E–MAX491Eand MAX1487E are low-power transceivers for RS-485and RS-422 communications. These “E” versions of theMAX481, MAX483, MAX485, MAX487–MAX491, andMAX1487 provide extra protection against ESD. Therugged MAX481E, MAX483E, MAX485E, MAX497E–MAX491E, and MAX1487E are intended for harsh envi-ronments where high-speed communication is important.These devices eliminate the need for transient suppres-sor diodes and the associated high capacitance loading.The standard (non-“E”) MAX481, MAX483, MAX485,MAX487–MAX491, and MAX1487 are recommended forapplications where cost is critical.The MAX481E, MAX485E, MAX490E, MAX491E, andMAX1487E can transmit and receive at data rates up to2.5Mbps, while the MAX483E, MAX487E, MAX488E,and MAX489E are specified for data rates up to250kbps. The MAX488E–MAX491E are full-duplextransceivers, while the MAX481E, MAX483E, MAX487E,and MAX1487E are half-duplex. In addition, driver-enable (DE) and receiver-enable (RE) pins are includedon the MAX481E, MAX483E, MAX485E, MAX487E,MAX489E, MAX491E, and MAX1487E. When disabled,the driver and receiver outputs are high impedance.±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structuresare incorporated on all pins to protect against electro-static discharges encountered during handling andassembly. The driver outputs and receiver inputs haveextra protection against static electricity. Maxim’s engi-

When write leveling is enabled, the rising edge of DQS samples CK, and the prime DQ

outputs the sampled CK’s status. The prime DQ for a x4 or x8 configuration is DQ0 with

all other DQ (DQ[7:1]) driving LOW. The prime DQ for a x16 configuration is DQ0 for the

lower byte and DQ8 for the upper byte. It outputs the status of CK sampled by LDQS

and UDQS. All other DQ (DQ[7:1], DQ[15:9]) continue to drive LOW. Two prime DQ on a

x16 enable each byte lane to be leveled independently.

The write leveling mode register interacts with other mode registers to correctly config-

ure the write leveling functionality. Besides using MR1[7] to disable/enable write level-

ing, MR1[12] must be used to enable/disable the output buffers. The ODT value, burst

length, and so forth need to be selected as well. This interaction is shown in Table 71. It