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LMS485ECMX

更新时间： 2024-11-28 22:47:03

品牌	Logo	应用领域
美国国家半导体 - NSC		总线收发器
页数	文件大小	规格书
13页	247K
描述
Low Power RS-485 / RS-422 Differential Bus Transceiver

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LMS485ECMX 数据手册

November 2003

LMS485E

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

General Description

Features

n Meet ANSI standard RS-485 and RS-422

n Data rate 2.5 Mbps

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

15kV ESD protection. The LMS485E combines a TRI-

n Single supply voltage operation, 5V

n Wide input and output voltage range

n Thermal shutdown protection

n Short circuit protection

n Low quiescent current 800µA (max)

n Allows up to 32 transceivers on the bus

n Open circuit fail-safe for receiver

n Extended operating temperature range −40˚C to 85˚C

n Drop-in replacement to MAX485E

n Available in 8-pin SOIC and 8-pin DIP packages

™

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 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’s MAX485E.

Applications

n Low power RS-485 systems

n Network hubs, bridges, and routers

n Point of sales equipment (ATM, barcode scanners,…)

n Local area networks (LAN)

n Integrated service digital network (ISDN)

n Industrial programmable logic controllers

n High speed parallel and serial applications

n 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.

DS200866

www.national.com

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与LMS485ECMX相关器件

型号	品牌	获取价格	描述	数据表
LMS485ECMX/NOPB	TI	获取价格	LINE TRANSCEIVER, PDSO8
LMS485ECNA	NSC	获取价格	Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS485ECNA/NOPB	TI	获取价格	LINE TRANSCEIVER, PDIP8, DIP-8
LMS485EIM	NSC	获取价格	Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS485EIMX	NSC	获取价格	Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS485EIMX/NOPB	TI	获取价格	LINE TRANSCEIVER, PDSO8, SOIC-8
LMS485EINA	NSC	获取价格	Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS485EINA/NOPB	TI	获取价格	LINE TRANSCEIVER, PDIP8, DIP-8
LMS485IM	NSC	获取价格	5V Low Power RS-485 / RS-422 Differential Bus
LMS485IMX	NSC	获取价格	5V Low Power RS-485 / RS-422 Differential Bus

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