Interface & Connectivity

Overview

Description

The ISL33354E, ISL33357E are two port interface ICs where port 1 is configured as a dual (2 Tx, 2 Rx) RS-232 transceiver, and port 2 is a single RS-485/422 transceiver. An on-board charge pump generates RS-232 compliant ±5V Tx output levels from a single VCC supply as low as 4. 5V. The transceivers are RS-232 compliant, with the Rx inputs handling up to ±25V. The port 2 transceiver supports both the RS-485 and RS-422 differential communication standards. The receiver features full fail-safe operation, so the Rx output remains in a high state if the inputs are open or shorted together. The transmitter supports two data rates, one of which is slew rate limited for problem free communication at low data rates. The active low Rx enable pin (RE485) allows Tx/Rx direction control, via a single signal, simply by connecting the corresponding DE485 and RE485 pins together. The ISL33354E and ISL33357E also include a shutdown function, which disables the Tx and Rx outputs, disables the charge pumps and places the IC in a low current (55µA) mode. The ISL33357E is a QFN packaged device for space constrained applications.

Features

  • ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
  • Operates from a single 5V supply
  • Two independent ports: port 1 set for RS-232 (2 transceivers) and port 2 for RS-485/RS-422 (1 transceiver)
  • True flow-through pinouts (Rx inputs and Tx outputs all on the same side) simplify board layouts
  • Pb-free (RoHS compliant)
  • Full fail-safe (open/short) RS-485/422 port 2 Rx
  • User selectable RS-485 data rates
  • Fast speed: up to 20Mbps
  • Slew rate limited: up to 115kbps
  • Fast RS-232 data rate: 460kbps (Minimum)
  • Small charge pump capacitors: 4 x 0.1µF
  • Low current shutdown mode: 55µA
  • QFN package saves board space (ISL33357E only)

Documentation

Title Type Date
PDF1.32 MB
Datasheet
PDF366 KB
Application Note
PDF178 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
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Application Note
PDF338 KB
Application Note
PDF365 KB
Application Note
PDF369 KB
Application Note
PDF500 KB
Application Note
PDF375 KB
Application Note
PDF2.72 MB日本語
Brochure
PDF156 KB
Other
PDF253 KB
Other
PDF359 KB
Other
PDF580 KB
Other
PDF438 KB
Report
PDF188 KB
Technical Brief
PDF300 KB
Technical Brief
PDF328 KB
Technical Brief
PDF920 KB 简体中文
White Paper
PDF918 KB 简体中文
White Paper

Design & Development

Models

Support