Datasheet > LMS1487EIMX

LMS1487EIMX

更新时间： 2024-10-31 21:53:55

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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LMS1487EIMX 数据手册

November 2003

LMS1487E

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 LMS1487E is a low power differential bus/line trans-

ceiver designed for high speed bidirectional data communi-

cation 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 LMS1487E combines a

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 660µA (max)

n Allows up to 128 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 MAX1487E

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

™

TRI-STATE differential line driver and differential input re-

ceiver, 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 re-

ceiver 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 com-

mon mode voltage ranges, making the device suitable for

multipoint applications in noisy environments. The

LMS1487E is available in 8-Pin SOIC and 8-pin DIP pack-

ages. It is a drop-in replacement to Maxim’s MAX1487E.

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

20085601

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.

DS200856

www.national.com

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与LMS1487EIMX相关器件

型号	品牌	获取价格	描述	数据表
LMS1487EIMX/NOPB	TI	获取价格	LINE TRANSCEIVER, PDSO8, SOIC-8
LMS1487EINA	NSC	获取价格	Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS1487IM	NSC	获取价格	5V Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS1487IM/NOPB	ROCHESTER	获取价格	LINE TRANSCEIVER, PDSO8, SOIC-8
LMS1487IMX	NSC	获取价格	5V Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS1487INA	NSC	获取价格	5V Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS1585	NSC	获取价格	5A and 3A Low Dropout Fast Response Regulators
LMS1585A	NSC	获取价格	5A and 3A Low Dropout Fast Response Regulators
LMS1585A	TI	获取价格	5A、13V 线性稳压器
LMS1585A_15	TI	获取价格	LMS1585A 5A/LMS1587 5A and 3A Low Dropout Fast Response Regulators

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