General Description

The MAX3280E/MAX3281E/MAX3283E/MAX3284E are

single receivers designed for RS-485 and RS-422 com-

munication. These devices guarantee data rates up to

52Mbps, even with a 3V power supply. Excellent propa-

gation delay (15ns max) and package-to-package

skew time (8ns max) make these devices ideal for mul-

tidrop clock distribution applications.

The MAX3280E/MAX3281E/MAX3283E/MAX3284E

have true fail-safe circuitry, which guarantees a logic-

high receiver output when the receiver inputs are

opened or shorted. The receiver output will be a logic

high if all transmitters on a terminated bus are disabled

(high impedance). These devices feature 1/4-unit-load

receiver input impedance, allowing up to 128 receivers

on the same bus.

The MAX3280E is a single receiver available in a 5-pin

SOT23 package. The MAX3281E/MAX3283E single

receivers have a receiver enable (EN or EN) function

and are offered in a 6-pin SOT23 package. The

MAX3284E features a voltage logic pin that allows com-

patibility with low-voltage logic levels, as in digital

FPGAs/ASICs. On the MAX3284E, the voltage threshold

offered in a 6-pin SOT23 package.

Applications

Clock Distribution

Telecom Racks

Base Stations

Industrial Control

Local Area Networks

Features

o ESD Protection:

±15kV–Human Body Model

±6kV–IEC 1000-4-2, Contact Discharge

±12kV–IEC 1000-4-2, Air-Gap Discharge

o Guaranteed 52Mbps Data Rate

o Guaranteed 15ns Receiver Propagation Delay

o Guaranteed 2ns Receiver Skew

o Guaranteed 8ns Package-to-Package Skew Time

o Allow Up to 128 Transceivers on the Bus

(1/4-unit-load)

o Tiny SOT23 Package

o True Fail-Safe Receiver

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

o 3V to 5.5V Power-Supply Range

o Enable (High and Low) Pins for Redundant

Operation

o Three-State Output Stage (MAX3281E/MAX3283E)

o Thermal Protection Against Output Short Circuit

±15kV ESD-Protected 52Mbps, 3V to 5.5V, SOT23

RS-485/RS-422 True Fail-Safe Receivers

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2320; Rev 0; 1/02

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.

Pin Configurations appear at end of data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX3280EAUK-T

-40°C to +125°C

5 SOT23-5

ADVM

MAX3281EAUT-T

-40°C to +125°C

6 SOT23-6

ABAT

MAX3283EAUT-T

-40°C to +125°C

6 SOT23-6

ABAU

MAX3284EAUT-T

-40°C to +125°C

6 SOT23-6

ABAV

Selector Guide

PART

ENABLE

DATA RATE

PACKAGE

MAX3280E

——

52Mbps

5-Pin SOT23

MAX3281E

—

Active High

52Mbps

6-Pin SOT23

MAX3283E

—

Active Low

52Mbps

6-Pin SOT23

MAX3284E

✔

—

52Mbps (Note 1)

6-Pin SOT23