Rainbow-electronics MAX3469 Manual de usuario descargar pdf

General Description

The MAX3465–MAX3469 are high-speed differential

bus transceivers for RS-485 and RS-422 communica-

tions. They are designed to meet TIA/EIA-422-B,

TIA/EIA-485-A, V.11, and X.27 standards. The trans-

ceiver complies with the Profibus specification provid-

ing +2.1V minimum output level with a 54Ω load,

40Mbps data rate, and output skew less than 2ns. Each

part contains one three-state differential line driver and

one differential input line receiver. The devices operate

from a +5V supply and feature true fail-safe circuitry,

which guarantees a logic-high receiver output when the

receiver inputs are open or shorted. This enables all

receiver outputs on a terminated bus to output logic

highs when all transmitters are disabled.

All devices feature a 1/4-standard-unit load receiver

input impedance that allows 128 transceivers on the

bus. Driver and receiver propagation delays are guar-

anteed under 20ns for multidrop, clock distribution

applications. Drivers are short-circuit current limited

and are protected against excessive power dissipation

by thermal-shutdown circuitry. The driver and receiver

feature active-high and active-low enables, respective-

ly, that can be connected together externally to serve

as a direction control.

Applications

High-Speed RS-485 Communications

High-Speed RS-422 Communications

Level Translators

Industrial-Control Local Area Networks

Profibus Applications

Features

♦ Recommended for Profibus Applications

♦ Up to 40Mbps Data Rate

♦ 15ns Transmitter Propagation Delay

♦ 20ns Receiver Propagation Delay

♦ 2ns Transmitter and Receiver Skew

♦ High Differential Driver Output Level (2.1V on 54Ω)

♦ Hot-Swap Versions

♦ 1µA Shutdown Supply Current

♦ Low Supply Current Requirements (2.5mA, typ)

♦ Allow Up to 128 Transceivers on the Bus

♦ True Fail-Safe Receiver while Maintaining EIA/TIA-

485 Compatibility

♦ Designed for Multipoint Transmissions on Long

or Noisy Bus Lines

♦ Full-Duplex and Half-Duplex Versions Available

♦ Phase Controls to Correct for Twisted-Pair

Reversal for 14-Pin Versions

♦ Current-Limiting and Thermal Shutdown for

Driver Overload Protection

MAX3465–MAX3469

+5V, Fail-Safe, 40Mbps, Profibus RS-485/

RS-422 Transceivers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

PART

NUMBER

HALF/FULL

DUPLEX

RECEIVER/

DRIVER

ENABLE

LOW-

POWER

SHUTDOWN

HOT SWAP

RECEIVER/

DRIVER PHASE

SELECT

INDEPENDENT

SHDN PIN

PIN COUNT

MAX3465 Full Yes Yes Yes Yes Yes 14

MAX3466 Full Yes Yes No Yes Yes 14

MAX3467 Full No No No No No 8

MAX3468 Half Yes Yes Yes No No 8

MAX3469 Half Yes Yes No No No 8

Selector Guide

19-3038; Rev 0; 10/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information continued at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX3465CSD 0°C to +70°C 14 SO

MAX3465CPD 0°C to +70°C 14 Plastic DIP

MAX3465ESD -40°C to +85°C 14 SO

MAX3465EPD -40°C to +85°C 14 Plastic DIP

Pin Configurations appear at end of data sheet.

1 2 3 4 5 6 ... 13 14

Indice de contenidos

Pagina 1 - RS-422 Transceivers

General DescriptionThe MAX3465–MAX3469 are high-speed differentialbus transceivers for RS-485 and RS-422 communica-tions. They are designed to meet TI

Pagina 2

MAX3465–MAX3469+5V, Fail-Safe, 40Mbps, Profibus RS-485/RS-422 Transceivers10 _________________________________________________________________________

Pagina 3