1

®

FN6543.2

ISL3280E, ISL3281E, ISL3282E,

ISL3283E, ISL3284E, ISL3285E

±16.5kV ESD Protected, +125°C, 3.0V to

5.5V, SOT-23/TDFN Packaged, 20Mbps,

Full Fail-safe, Low Power, RS-485/RS-422

Receivers

The Intersil ISL3280E, ISL3281E, ISL3282E, ISL3283E,

ISL3284E, ISL3285E are ±16.5kV IEC61000 ESD

Protected, 3.0V to 5.5V powered, single receivers that meet

both the RS-485 and RS-422 standards for balanced

communication. These receivers have very low bus currents

(+125µA/-100µA), so they present a true “1/8 unit load” to the

RS-485 bus. This allows up to 256 receivers on the network

without violating the RS-485 specification’s 32 unit load

maximum and without using repeaters.

Receiver inputs feature a “Full Fail-Safe” design, which

ensures a logic high Rx output if Rx inputs are floating,

shorted, or terminated but undriven.

The ISL3280E and ISL3284E feature an always enabled Rx;

the ISL3281E and ISL3285E feature an active high Rx

enable pin, and the ISL3282E and ISL3283E include an

active low enable pin. All versions are offered in Industrial

and Extended Industrial (-40°C to +125°C) temperature

ranges.

A 26% smaller footprint is available with the ISL3282E and

ISL3285E TDFN package. These devices, plus the

RE / RE input) to be compatible with another supply voltage

in mixed voltage systems.

For companion single RS-485 transmitters in micro

packages, please see the ISL3293E, ISL3294E, ISL3295E,

ISL3296E, ISL3297E, ISL3298E data sheet.

Features

- Class 3 ESD Level on all Other Pins . . . . . . >5kV HBM

• Pb-Free (RoHS Compliant)

• Wide Supply Range . . . . . . . . . . . . . . . . . . . 3.0V to 5.5V

• Specified for +125°C Operation

Systems (ISL3282E, ISL3284E, ISL3285E Only)

• Full Fail-safe (Open, Short, Terminated/Undriven)

• True 1/8 Unit Load Allows up to 256 Devices on the Bus

• High Data Rates . . . . . . . . . . . . . . . . . . . . . up to 20Mbps

• Low Quiescent Supply Current . . . . . . . . . . 500µA (Max)

- Very Low Shutdown Supply Current . . . . . . 20µA (Max)

• -7V to +12V Common Mode Input Voltage Range

• Tri-statable Rx Available (Active Low or High EN Input)

Applications

• Clock Distribution

• High Node Count Systems

• Space Constrained Systems

• Security Camera Networks

• Building Environmental Control/Lighting Systems

• Industrial/Process Control Networks

TABLE 1. SUMMARY OF FEATURES

PART

NUMBER

FUNCTION

DATA RATE

(Mbps)

# DEVICES

ON BUS

RX

ENABLE?

QUIESCENT

LOW POWER

SHUTDOWN?

LEAD

COUNT

ISL3280E

1 Rx

20

256

NO

NO

350

NO

5-SOT

ISL3281E

1 Rx

20

256

ACTIVE HIGH

NO

350

YES

6-SOT

ISL3282E

1 Rx

20

256

ACTIVE LOW

YES

350

YES

8-TDFN

ISL3283E

1 Rx

20

256

ACTIVE LOW

NO

350

YES

6-SOT

ISL3284E

1 Rx

20

256

NO

YES

350

NO

6-SOT

ISL3285E

1 Rx

20

256

ACTIVE HIGH

YES

350

YES

8-TDFN

Data Sheet

October 18, 2007

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Copyright Intersil Americas Inc. 2007. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.