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LMS485EINA Datasheet

  • LMS485EINA

  • Low Power RS-485 / RS-422 Differential Bus Transceiver

  • 13頁

  • NSC

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LMS485E Low Power RS-485 / RS-422 Differential Bus Transceiver
November 2003
LMS485E
Low Power RS-485 / RS-422 Differential Bus Transceiver
General Description
The LMS485E 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 driver outputs and receiver inputs have
鹵
15kV ESD protection. The LMS485E combines a TRI-
STATE
鈩?/div>
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 outputs and receiver inputs are
internally connected to form a differential input/output (I/O)
bus port that is designed to offer minimum loading to bus
whenever the driver is disabled or when V
CC
= 0V. These
ports feature wide positive and negative common mode
voltage ranges, making the device suitable for multipoint
applications in noisy environments. The LMS485E is avail-
able in 8-Pin SOIC and 8-pin DIP packages. It is a drop-in
replacement to Maxim鈥檚 MAX485E.
Features
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Meet ANSI standard RS-485 and RS-422
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 800碌A(chǔ) (max)
Allows up to 32 transceivers on the bus
Open circuit fail-safe for receiver
Extended operating temperature range 鈭?0藲C to 85藲C
Drop-in replacement to MAX485E
Available in 8-pin SOIC and 8-pin DIP packages
Applications
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Low power RS-485 systems
Network hubs, bridges, and routers
Point of sales equipment (ATM, barcode scanners,鈥?
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 Application
20086601
A typical multipoint application is shown in the above figure. Terminating resistor, RT are typically required but only located at the two ends of the cable.
Pull-up and pull-down resistors maybe required at the end of the bus to provide fail-safe biasing. The biasing resistors provide a bias to the cable when all
drivers are in TRI-STATE, See National Application Note, AN-847 for further information.
漏 2003 National Semiconductor Corporation
DS200866
www.national.com

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