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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
Allows up to 128 transceivers on the bus
Open circuit fail-safe for receiver
Extended operating temperature range −40°C to 85°C
Drop-in replacement to MAX1487
Available in 8-pin SOIC and 8-pin DIP package
Description The LMS1487 is a low power differential bus/line transceiver designed for high speed bidirectional data communication on multipoint
bus transmission lines. It is designed for 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 combines a TRI-STATE differential line driver and differential input receiver, both of which operate from a single 5.0V power supply. The driver
and receiver have an active high and active low, respectively, that can be externally connected to function as a direction
control. The driver and receiver differential inputs are internally connected to form differential input/output (I/O) bus
ports that are designed to offer minimum loading to bus whenever the driver is disabled or when VCC = 0V. These ports feature wide positive and negative common mode voltage ranges, making the device suitable for multipoint
applications in noisy environments. The LMS1487 is available in a 8-Pin SOIC and 8-pin DIP packages. It is a drop-in socket
replacement to Maxim’s MAX1487
Applications
Low power RS-485 systems
Network hubs, bridges, and routers
Point of 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
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