ISL8488 INTERSIL [Intersil Corporation], ISL8488 Datasheet

ISL8488

Manufacturer Part Number

ISL8488

Description

5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

Manufacturer

INTERSIL [Intersil Corporation]

Datasheet

1.ISL8488.pdf (16 pages)

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5V, Low Power, High Speed or Slew Rate

Limited, RS-485/RS-422 Transceivers

The Intersil RS-485/RS-422 devices are BiCMOS 5V

powered, single transceivers that meet both the RS-485 and

RS-422 standards for balanced communication. Unlike

competitive devices, this Intersil family is specified for 10%

tolerance supplies (4.5V to 5.5V).

The ISL8483, ISL8488, and ISL8489 utilize slew rate limited

drivers which reduce EMI, and minimize reflections from

improperly terminated transmission lines, or unterminated

stubs in multidrop and multipoint applications.

Data rates up to 5Mbps are achievable by using the

ISL8485, ISL8490, or ISL8491, which feature higher slew

rates.

All devices present a “single unit load” to the RS-485 bus,

which allows up to 32 transceivers on the network.

Receiver (Rx) inputs feature a “fail-safe if open” design,

which ensures a logic high Rx output if Rx inputs are

floating.

Driver (Tx) outputs are short circuit protected, even for

voltages exceeding the power supply voltage. Additionally,

on-chip thermal shutdown circuitry disables the Tx outputs to

prevent damage if power dissipation becomes excessive.

The ISL8488 - 91 are configured for full duplex (separate Rx

input and Tx output pins) applications. The ISL8488 and

ISL8490 are offered in space saving 8 lead packages for

applications not requiring Rx and Tx output disable functions

(e.g., point-to-point). Half duplex configurations (ISL8483,

ISL8485) multiplex the Rx inputs and Tx outputs to allow

transceivers with Rx and Tx disable functions in 8 lead

packages.

NUMBER

ISL8483

ISL8485

ISL8488

ISL8489

ISL8490

ISL8491

PART

HALF/FULL

DUPLEX

Half

Full

ALLOWED ON BUS

NO. OF DEVICES

Data Sheet

DATA RATE

TABLE 1. SUMMARY OF FEATURES

(Mbps)

0.25

1-888-INTERSIL or 321-724-7143

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

SLEW-RATE

LIMITED?

Yes

Features

• Specified for 10% Tolerance Supplies

• Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV

• High Data Rates. . . . . . . . . . . . . . . . . . . . . . up to 5Mbps

• Slew Rate Limited Versions for Error Free Data

• Single Unit Load Allows up to 32 Devices on the Bus

• 1nA Low Current Shutdown Mode (ISL8483)

• Low Quiescent Current:

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

• Three State Rx and Tx Outputs (Except ISL8488,

• 30ns Propagation Delays, 5ns Skew (ISL8485, ISL8490,

• Full Duplex and Half Duplex Pinouts

• Operate from a Single +5V Supply (10% Tolerance)

• Current Limiting and Thermal Shutdown for driver

Applications

• Factory Automation

• Security Networks

• Building Environmental Control Systems

• Industrial/Process Control Networks

• Level Translators (e.g., RS-232 to RS-422)

• RS-232 “Extension Cords”

Transmission at 250kbps (ISL8483, ISL8488, ISL8489)

- 160

- 340

ISL8490)

ISL8491)

Overload Protection

DRIVER ENABLE?

December 2003

RECEIVER/

ISL8483, ISL8485, ISL8488,

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

ISL8489, ISL8490, ISL8491

A (ISL8483, ISL8488, ISL8489)

A (ISL8485, ISL8490, ISL8491)

Yes

Intersil (and design) is a registered trademark of Intersil Americas Inc.

QUIESCENT

160

340

160

340

(µA)

SHUTDOWN?

LOW POWER

Yes

FN6046.3

COUNT

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