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LMS75ALS176AMNSN/a5700avaiDifferential Bus Transceivers


LMS75ALS176AM ,Differential Bus Transceiversapplications with noisy environmentTypical Application20047801A Typical multipoint application is s ..
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LMS75ALS176AM
Differential Bus Transceivers
LMS75ALS176A
Differential Bus Transceivers
General Description

The LMS75ALS176Aisa differential bus/line transceiver
designedfor bidirectional data communicationon multipoint
bus transmission lines.Itis designedfor balanced transmis-
sion lines.It meets ANSI Standards TIA/EIA RS422-B, TIA/
EIA RS485-A and ITU recommendation V.11 and X.27. The
LMS75ALS176A combinesa TRI-STATE™ differential line
driver and differential input receiver, bothof which operate
froma single 5.0V power supply. The driver and receiver
havean active high and active low enable, respectively, that
canbe externally connectedto functionasa direction con-
trol. The driver and receiver differential inputs are internally
connectedto form differential input/output (I/O) bus ports
thatare designedto offer minimum loadingto bus whenever
the driveris disabledor when VCC=0V. These ports feature
wide positive and negative common mode voltage ranges,
making the device suitable for multipoint applicationsin
noisy environments. The LMS75ALS176Ais availableina
8-Pin SOIC package.Itisa drop-in socket replacementto
TI’s SN75ALS176A.
Features
Bidirectional transceiver Meet ANSI standard RS-485-A and RS-422-B Low skew, 2ns Low supply current, 8mA (max.) Wide input and output voltage range High output drive capacity ±60mA Thermal shutdown protection Open circuit fail-safefor receiver Receiver input sensitivity ±200mV Receiver input hysteresis 10mV (min.) Single supply voltage operation,5V Glitch free power-up and power-down operation Data ratesupto35 Mbaud Pin and functional compatible with TI’s SN75ALS176A 8-Pin SOIC
Applications
Network hubs, bridges, and routers Pointof sales equipment (ATM, barcode readers,…) Industrial programmable logic controllers High speed parallel and serial applications Multipoint applications with noisy environment
Typical Application

20047801 Typical multipoint applicationis showninthe above figure. Terminating resistors,RT,are typically requiredbut only locatedatthetwo endsofthe cable.
Pullupandpull down resistors maybe requiredattheendofthebusto provide failsafe biasing.The biasing resistors provideabiastothe cable whenall
driversarein TRI-STATE,See National Application Note, AN-847for further information.
April 2003
LMS75ALS176A
Differential
Bus
ransceivers
ic,good price


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