1

®

FN6115.1

ISL83070E, ISL83071E, ISL83072E, ISL83073E,

ISL83075E, ISL83076E, ISL83077E, ISL83078E

Low Power, High Speed or Slew Rate

Limited, RS-485/RS-422 Transceivers

The Intersil ISL8307XE are BiCMOS 3.3V powered, single

transceivers that meet both the RS-485 and RS-422

standards for balanced communication.

These devices have

very low bus currents (+125

µA/-100µA), so they present a

true “1/8 unit load” to the RS-485 bus. This allows up to 256

transceivers on the network without violating the RS-485

specification’s 32 unit load maximum, and without using

repeaters. For example, in a remote utility meter reading

system, individual meter readings are routed to a concentrator

via an RS-485 network, so the high allowed node count

minimizes the number of repeaters required.

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

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

shorted, or terminated but undriven.

Hot Plug circuitry ensures that the Tx and Rx outputs remain

in a high impedance state while the power supply stabilizes.

The ISL83070E through ISL83075E utilize slew rate limited

drivers which reduce EMI, and minimize reflections from

improperly terminated transmission lines, or unterminated

stubs in multidrop and multipoint applications. Slew rate limited

versions also include receiver input filtering to enhance noise

immunity in the presence of slow input signals.

The ISL83070E, ISL83071E, ISL83073E, ISL83076E,

ISL83077E

are configured for full duplex (separate Rx input

and Tx output pins) applications. The half duplex versions

multiplex the Rx inputs and Tx outputs to allow transceivers

with output disable functions in 8 lead packages.

Features

• Pb-Free Plus Anneal (RoHS Compliant)

- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM

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

Receivers

• Hot Plug - Tx and Rx Outputs Remain Three-state During

Power-up

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

• Single 3.3V Supply

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

- Ultra Low Shutdown Supply Current . . . . . . . . . . 10nA

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

• Half and Full Duplex Pinouts

• Three State Rx and Tx Outputs Available

• Current Limiting and Thermal Shutdown for driver

Overload Protection

• Tiny MSOP package offering saves 50% board space

Applications

• Automated Utility Meter Reading Systems

• High Node Count Systems

• Field Bus Networks

• Security Camera Networks

• Building Environmental Control/ Lighting Systems

• Industrial/Process Control Networks

TABLE 1. SUMMARY OF FEATURES

PART

NUMBER

HALF/FULL

DUPLEX

DATA RATE

(Mbps)

SLEW-RATE

LIMITED?

HOT

PLUG?

# DEVICES

ON BUS

RX / TX

ENABLE?

QUIESCENT

LOW POWER

SHUTDOWN?

PIN

COUNT

ISL83070E

FULL

0.25

YES

YES

256

YES

510

YES

14

ISL83071E

FULL

0.25

YES

YES

256

NO

510

NO

8

ISL83072E

HALF

0.25

YES

YES

256

YES

510

YES

8

ISL83073E

FULL

0.5

YES

YES

256

YES

510

YES

14

ISL83075E

HALF

0.5

YES

YES

256

YES

510

YES

8

ISL83076E

FULL

20

NO

YES

256

YES

510

YES

14

ISL83077E

FULL

20

NO

YES

256

NO

510

NO

8

ISL83078E

HALF

20

NO

YES

256

YES

510

YES

8

Data Sheet

August 5, 2005

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

1-888-INTERSIL or 1-888-468-3774

Copyright Intersil Americas Inc. 2005. All Rights Reserved

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