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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 384

RS485 transceivers sustain ±60V faults

Gary Maulding

Abstract

The LT1785 and LT1791 RS485/RS422 transceivers, which have ±60V fault tolerance, are described.

Keywords

RS485/RS422 transceivers

LT1785

LT1791

Introduction

The LT1785 and LT1791 RS485/RS422 transceivers with ±60V fault tolerance solve a real-world problem of field failures in typical RS485 interface circuits. Modems and other computer peripherals use point-to-point RS422 connections to support higher communication speeds with better noise immunity over greater distances than is possible with RS232 connections. Multipoint RS485 networks are used for LANs and industrial control networks. All of these applications are vulnerable to the unknown, sometimes hostile ...

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