Datasheet > LMS1487ECNA

LMS1487ECNA

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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LMS1487ECNA 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LMS1487ECNA相关器件

型号	品牌	获取价格	描述	数据表
LMS1487EIM	NSC	获取价格	Low Power RS-485 / RS-422 Differential Bus Transceiver
LMS1487EIM/NOPB	TI	获取价格	LINE TRANSCEIVER, PDSO8, SOIC-8
LMS1487EIMX	NSC	获取价格	Low Power RS-485 / RS-422 Differential Bus Transceiver
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

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