LMS1487IM ,5V Low Power RS-485 / RS-422 Differential Bus TransceiverApplicationsvoltage ranges, making the device suitable for multipointn Low power RS-485 systems
LMS1487INA ,5V Low Power RS-485 / RS-422 Differential Bus TransceiverFeaturesn Meet ANSI standard RS-485-A and RS-422-BTheLMS1487isalowpowerdifferentialbus/linetranscei ..
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LMS1487CM-LMS1487CMX-LMS1487ECM-LMS1487ECNA-LMS1487EINA-LMS1487IM-LMS1487INA
5V Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS1487 Low Power RS-485/ RS-422 Differential Bus
Transceiver
General DescriptionThe LMS1487isalow power differential bus/line transceiver
designedfor high speed bidirectional data communicationon
multipoint bus transmission lines.Itis designedfor balanced
transmission lines.It meets ANSI Standards TIA/EIA
RS422-B, TIA/EIA RS485-A and ITU recommendation and
V.11 and X.27. The LMS1487 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, respec-
tively, that canbe externally connectedto functionasa
direction control. The driver and receiver differential inputs
are internally connectedto form differential input/output (I/O)
bus ports that are 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 suitablefor multipoint
applicationsin noisy environments. The LMS1487is avail-
ableina 8-Pin SOIC and 8-pin DIP packages.Itisa drop-in
socket replacementto Maxim’s MAX1487
Features Meet ANSI standard RS-485-A and RS-422-B Data rate 2.5 Mbps Single supply voltage operation,5V Wide input and output voltage range Thermal shutdown protection Short circuit protection Low quiescent current 320µA Allowsupto 128 transceiverson the bus Open circuit fail-safefor receiver Extended operating temperature range −40˚Cto 85˚C Drop-in replacementto MAX1487 Availablein 8-pin SOIC and 8-pin DIP package
Applications Low power RS-485 systems Network hubs, bridges, and routers Pointof sales equipment (ATM, barcode scanners,…) Local area networks (LAN) Integrated service digital network (ISDN) Industrial programmable logic controllers High speed parallel and serial applications Multipoint applications with noisy environment
Typical Application20053001 Typical multipoint applicationis showninthe above figure. Terminating resistors,RT,are typically requiredbut only locatedatthetwo endsofthe cable.
Pullupandpull down resistors maybe requiredattheendofthebusto provide fail-safe biasing.The biasing resistors provideabiastothe cable whenall
driversarein TRI-STATE,See National Application Note, AN-847for further information.
April 2003
LMS1487
Low
Power
RS-485
RS-422
Differential
Bus
ransceiver
