Selector Guide

General Description

The MAX3440E–MAX3444E fault-protected RS-485 and

J1708 transceivers feature

±60V protection from signal

faults on communication bus lines. Each device contains

one differential line driver with three-state output and one

differential line receiver with three-state input. The 1/4-unit-

load receiver input impedance allows up to 128 trans-

ceivers on a single bus. The devices operate from a 5V

supply at data rates of up to 10Mbps. True fail-safe inputs

guarantee a logic-high receiver output when the receiver

inputs are open, shorted, or connected to an idle data line.

Hot-swap circuitry eliminates false transitions on the

data bus during circuit initialization or connection to a

live backplane. Short-circuit current-limiting and ther-

mal shutdown circuitry protect the driver against exces-

sive power dissipation, and on-chip

±15kV ESD

protection eliminates costly external protection devices.

The MAX3440E–MAX3444E are available in 8-pin SO

and PDIP packages and are specified over industrial

and automotive temperature ranges.

Applications

RS-422/RS-485 Communications

Truck and Trailer Applications

Industrial Networks

Telecommunications Systems

Automotive Applications

HVAC Controls

Features

o ±15kV ESD Protection

o ±60V Fault Protection

o Guaranteed 10Mbps Data Rate

(MAX3441E/MAX3443E)

o Hot Swappable for Telecom Applications

o True Fail-Safe Receiver Inputs

o Enhanced Slew-Rate-Limiting Facilitates

Error-Free Data Transmission

(MAX3440E/MAX3442E/MAX3444E)

o Allow Up to 128 Transceivers on the Bus

o -7V to +12V Common-Mode Input Range

o Automotive Temperature Range (-40°C to +125°C)

o Industry-Standard Pinout

±15kV ESD-Protected, ±60V Fault-Protected,

10Mbps, Fail-Safe RS-485/J1708 Transceivers

________________________________________________________________ Maxim Integrated Products

1

TOP VIEW

1

2

3

4

8

5

GND

DI

DE/RE

RO

FAULT

R

D

Rt

Rt

7

6

D

R

DE/RE

FAULT

DI

RO

A

B

1

2

3

4

8

7

6

5

B

A

GND

DI

DE/RE

RO

FAULT

DIP/SO

DIP/SO

B

A

MAX3440E

MAX3441E

R

D

Pin Configurations and Typical Operating Circuits

Ordering Information

19-2666; Rev 0; 10/02

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.

PART

TEMP RANGE

PIN-PACKAGE

MAX3440EESA

-40°C to +85°C

8 SO

MAX3440EEPA

-40°C to +85°C

8 PDIP

MAX3440EASA

-40°C to +125°C

8 SO

MAX3440EAPA

-40°C to +125°C

8 PDIP

PART

TYPE

DATA RATE

(Mbps)

LOW-POWER

SHUTDOWN

RECEIVER/DRIVER

ENABLE

TRANSCEIVERS

ON BUS

HOT SWAP

MAX3440E

RS-485

0.25

No

Yes

128

Yes

MAX3441E

RS-485

2.5 to 10

No

Yes

128

Yes

MAX3442E

RS-485

0.25

Yes

Yes

128

Yes

MAX3443E

RS-485

2.5 to 10

Yes

Yes

128

Yes

MAX3444E

J1708

0.25

Yes

Yes

128

Yes (only RE)

Ordering Information continued at end of data sheet.

Pin Configurations and Typical Operating Circuits continued at end of data sheet.