General Description

The MAX3460–MAX3464 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 output level with a 54

Ω load, 20Mbps data

rate, and output skew less than 2ns. Each part contains

one three-state differential line driver and one differen-

tial input line receiver. The devices operate from a +5V

supply and feature true fail-safe circuitry, which guaran-

tees 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

o Recommended for Profibus Applications

o Guaranteed 20Mbps Data Rate

o 20ns Transmitter and Receiver Propagation Delay

o 2ns Transmitter and Receiver Skew

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

o Hot-Swap Versions

o 1µA Shutdown Supply Current

o Low Supply Current Requirements (2.5mA typ)

o Allow Up to 128 Transceivers on the Bus

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

485 Compatibility

o Designed for Multipoint Transmissions on Long

or Noisy Bus Lines

o Full Duplex and Half Duplex Versions Available

o Phase Controls to Correct for Twisted-Pair

Reversal for 14-Pin Versions

o Current-Limiting and Thermal Shutdown for

Driver Overload Protection

+5V, Fail-Safe, 20Mbps, 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

MAX3460

Full

Yes

Yes

Yes

Yes

Yes

14

MAX3461

Full

Yes

Yes

No

Yes

Yes

14

MAX3462

Full

No

No

No

No

No

8

MAX3463

Half

Yes

Yes

Yes

No

No

8

MAX3464

Half

Yes

Yes

No

No

No

8

Selector Guide

19-2217; Rev 1; 2/03

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

MAX3460CSD

0°C to +70°C

14 SO

MAX3460CPD

0°C to +70°C

14 Plastic DIP

MAX3460ESD

-40°C to +85°C

14 SO

MAX3460EPD

-40°C to +85°C

14 Plastic DIP

Pin Configurations appear at end of data sheet.