Overview

Description

The ISL33334E, ISL33337E 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/RS-422 transceiver. The on-board charge pump generates RS-232 compliant ±5V Tx output levels from a single VCC supply as low as 3. 15V. 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 ISL33334E and ISL33337E also include a shutdown function, which disables the Tx and Rx outputs, disables the charge pumps and places the IC in a low current (40μA) mode. The ISL33337E 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 3.3V 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: up to 400kbps
  • Small charge pump capacitors: 4 x 0.1μF
  • Low current shutdown mode: 40μA
  • QFN package saves board space (ISL33337E only)

Documentation

Document title Document type
Type
Date Date
PDF 1.37 MB Datasheet
PDF 365 KB Application Note
PDF 207 KB Application Note
PDF 474 KB Application Note
PDF 366 KB Application Note
PDF 178 KB Application Note
PDF 513 KB Application Note
PDF 826 KB Application Note
PDF 443 KB Application Note
PDF 582 KB Application Note
PDF 440 KB Application Note
PDF 338 KB Application Note
PDF 365 KB Application Note
PDF 375 KB Application Note
PDF 2.95 MB Brochure
PDF 1.17 MB End Of Life Notice
PDF 156 KB Other
PDF 253 KB Other
PDF 359 KB Other
PDF 580 KB Other
PDF 438 KB Report
PDF 266 KB 简体中文 Technical Brief
PDF 188 KB Technical Brief
PDF 328 KB Technical Brief
PDF 405 KB Training
PDF 239 KB Training
PDF 920 KB 简体中文 White Paper
PDF 918 KB 简体中文 White Paper
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Design & Development

Software & Tools

Software Downloads

Software title Software type Type Date Date
PDF 1.17 MB End Of Life Notice
1 item

Models