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Features
Meet ANSI standard RS-485-A and RS-422-B
Data rate 30Mbps
Single supply voltage operation, 5V
Wide input and output voltage range
Thermal shutdown protection
Short circuit protection
Driver propagation delay 10ns
Receiver propagation delay 25ns
High impedance outputs with power off
Open circuit fail-safe for receiver
Extended operating temperature range −40°C to 85°C
ESD rating 8kV HBM
Drop-in replacement to ADM1485 and LT1485
Available in 8-pin SOIC
Low supply current, ICC = 1mA
Description The LMS1485 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 LMS1485 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 LMS1485 is build with National’s advanced BiCMOS process and is available in a 8-Pin SOIC package. It is a drop-in socket
replacement to ADI’s ADM1485 and LTC’s LT1485.
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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