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LMS1485MX Datasheet

  • LMS1485MX

  • 5V Low Power RS-485 Differential Bus Transceiver

  • 10頁

  • NSC

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LMS1485 5V Low Power RS-485 Differential Bus Transceiver
July 2003
LMS1485
5V Low Power RS-485 Differential Bus Transceiver
General 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
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 and receiver differential inputs are internally con-
nected 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 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 LMS1485 is build with National鈥檚 advanced BiCMOS
process and is available in a 8-Pin SOIC package. It is a
drop-in socket replacement to ADI鈥檚 ADM1485 and LTC鈥檚
LT1485.
Features
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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 鈭?0藲C to 85藲C
ESD rating 8kV HBM
Drop-in replacement to ADM1485 and LT1485
Available in 8-pin SOIC
Low supply current, I
CC
= 1mA
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
20048801
A typical multipoint application is shown in the above figure. Terminating resistors, 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 failsafe 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
DS200488
www.national.com

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  • 英文版
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