Interface & Connectivity

Overview

Description

The ISL8485, ISL8490, and ISL8491 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 family is specified for 10% tolerance supplies (4. 5V to 5. 5V). The ISL8485, ISL8490, and ISL8491 feature data rates up to 5Mbps. All devices present a single unit load to the RS-485 bus, which allows up to 32 transceivers on the network. The receiver (Rx) inputs feature a “fail-safe if open” design, which ensures a logic high Rx output if the Rx inputs are floating. The 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 ISL8490 and ISL8491 are configured for full duplex (separate Rx input and Tx output pins) applications. Half duplex configurations (ISL8485) multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 Ld packages.

Features

  • Specified for 10% tolerance supplies
  • Class 3 ESD protection (HBM) on all pins: 7kV
  • High data rates: up to 5Mbps
  • Single unit load allows up to 32 devices on the bus
  • Low quiescent current: 500µA
  • -7V to +12V common-mode input voltage range
  • Three state Rx and Tx outputs (except ISL8490)
  • 30ns propagation delays, 5ns skew
  • Full duplex and half duplex pinouts
  • Operation from a single +5V supply (10% tolerance)
  • Current limiting and thermal shutdown for driver overload protection
  • Pb-free plus anneal (RoHS compliant)

Applications

  • Factory Automation
  • Security Networks
  • Building Environmental Control Systems
  • Industrial/Process Control Networks
  • Level Translators (eg, RS-232 to RS-422)
  • RS-232 "Extension Cords"

Documentation

Title Type Date
PDF928 KB
Datasheet
PDF207 KB
Application Note
PDF352 KB
Application Note
PDF474 KB
Application Note
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Application Note
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Application Note
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Application Note
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Application Note
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Application Note
PDF582 KB
Application Note
PDF440 KB
Application Note
PDF338 KB
Application Note
PDF365 KB
Application Note
PDF375 KB
Application Note
PDF2.72 MB日本語
Brochure
PDF388 KB
End Of Life Notice
PDF156 KB
Other
PDF253 KB
Other
PDF254 KB
Other
PDF106 KB
Product Advisory
PDF266 KB
Product Change Notice
PDF398 KB
Product Change Notice
PDF86 KB
Product Change Notice
PDF108 KB
Product Change Notice
PDF438 KB
Report
PDF188 KB
Technical Brief
PDF300 KB
Technical Brief
PDF920 KB 简体中文
White Paper

Design & Development

Software & Tools

Software Downloads

Title Type Date
PDF388 KB
End Of Life Notice

Models

Models

Title Type Date
IBS47 KB
Model - IBIS

Support