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19-1800; Rev 0; 9/00

鹵15kV ESD-Protected, Fail-Safe, High-Speed (10Mbps),

Slew-Rate-Limited RS-485/RS-422 Transceivers

MAX3080E鈥揗AX3089E

General Description

The MAX3080E鈥揗AX3089E are 鹵15kV electrostatic dis-

charge (ESD)-protected, high-speed transceivers for RS-

485/RS-422 communication that contain one driver and

one receiver. These devices feature fail-safe circuitry,

which guarantees a logic-high receiver output when the

receiver inputs are open or shorted. This means that the

receiver output will be a logic high if all transmitters on a

terminated bus are disabled (high impedance). The

MAX3080E/MAX3081E/MAX3082E feature reduced

slew-rate drivers that minimize EMI and reduce reflec-

tions caused by improperly terminated cables, allowing

error-free data transmission up to 115kbps. The

MAX3083E/MAX3084E/MAX3085E offer higher driver

output slew-rate limits, allowing transmit speeds up to

500kbps. The MAX3086E/MAX3087E/ MAX3088Es鈥?dri-

ver slew rates are not limited, making transmit speeds

up to 10Mbps possible. The MAX3089E鈥檚 slew rate is

selectable between 115kbps, 500kbps, and 10Mbps by

driving a selector pin with a single three-state driver. All

devices feature enhanced ESD protection. All transmitter

outputs and receiver inputs are protected to 鹵15kV

using the Human Body Model.

These transceivers typically draw 375碌A(chǔ) of supply

current when unloaded, or when fully loaded with the dri-

vers disabled.

All devices have a 1/8-unit-load receiver input impedance

that allows up to 256 transceivers on the bus. The

MAX3082E/MAX3085E/MAX3088E are intended for half-

duplex communications, while the MAX3080E/MAX3081E/

MAX3083E/MAX3084E/MAX3086E/MAX3087E are

intended for full-duplex communications. The MAX3089E

is selectable between half-duplex and full-duplex opera-

tion. It also features independently programmable

receiver and transmitter output phase via separate pins.

Features

o

ESD Protection for RS-485 I/O Pins

鹵15kV, Human Body Model

o

True Fail-Safe Receiver While Maintaining

EIA/TIA-485 Compatibility

o

Enhanced Slew-Rate Limiting Facilitates

Error-Free Data Transmission

(MAX3080E鈥揗AX3085E/MAX3089E)

o

1nA Low-Current Shutdown Mode (Except

MAX3081E/MAX3084E/MAX3087E)

o

Pin-Selectable Full/Half-Duplex Operation

(MAX3089E)

o

Phase Controls to Correct for Twisted-Pair

Reversal (MAX3089E)

o

Allow Up to 256 Transceivers on the Bus

Applications

RS-422/RS-485 Communications

Level Translators

Transceivers for EMI-Sensitive Applications

Industrial-Control Local Area Networks

Ordering Information

PART

MAX3080ECSD

MAX3080ECPD

MAX3080EESD

MAX3080EEPD

TEMP. RANGE

0擄C to +70擄C

0擄C to +70擄C

-40擄C to +85擄C

-40擄C to +85擄C

PIN-PACKAGE

14 SO

14 Plastic DIP

14 SO

14 Plastic DIP

Ordering Information continued at end of data sheet.

Selector Guide

Part

MAX3080E

MAX3081E

MAX3082E

MAX3083E

MAX3084E

MAX3085E

MAX3086E

MAX3087E

MAX3088E

MAX3089E

Half/Full

Duplex

Full

Full

Half

Full

Full

Half

Full

Full

Half

Selectable

Data

Rate

(Mbps)

0.115

0.115

0.115

0.5

0.5

0.5

10

10

10

Selectable

Slew-

Rate

Limited

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

Selectable

Low-

Power

Shutdown

Yes

No

Yes

Yes

No

Yes

Yes

No

Yes

Yes

Receiver/

Driver

Enable

Yes

No

Yes

Yes

No

Yes

Yes

No

Yes

Yes

Quiescent Transceivers

Current

On

(碌A(chǔ))

Bus (碌A(chǔ))

375

375

375

375

375

375

375

375

375

375

256

256

256

256

256

256

256

256

256

256

Pin

Count

14

8

8

14

8

8

14

8

8

14

Industry-

Standard

Pinout

75180

75179

75176

75180

75179

75176

75180

75179

75176

75180*

*Pin compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.

________________________________________________________________

Maxim Integrated Products

1

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

next

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