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ISL33354E

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5V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transeiver in a SSOP Package

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Overview

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.

ISL33354E_ISL33357E Functional Diagram
ISL33354E_ISL33357E Functional Diagram
  • ±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)

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FAQs

  1. The ISL33354E’s RS-232 transmitters can operate up to a data rate of 400kbps. I need to download data, how fast can they receive data?

    Question: How fast can the RS-232 receivers operate?   Answer: Receivers operate at data rates up to 2Mbps. They are designed for a higher data rate to facilitate faster factory downloading of software into the final product, thereby improving the user’s manufacturing throughput.

    Jan 1, 1970
  2. The ISL33354E's RS-485 channel is configured as full duplex but I need half duplex. Do you have a half-duplex version?

    Question: Do you have a half-duplex version?   Answer: We do not offer a  half-duplex version. You can easily configure the full duplex to a half-duplex by connecting it up that way externally.

    Jan 1, 1970