Interface

Overview

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.

ISL33334E_ISL33337E Functional Diagram
ISL33334E_ISL33337E Functional Diagram
  • ±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

Title Type Date
ISL33334E, ISL33337E Datasheet
PDF1.37 MB
Datasheet
AN1978: Surge Protection for Renesas' Standard RS-485 Transceivers
PDF365 KB
Application Note
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E
PDF207 KB
Application Note
AN1979: Surge Protection simplified with Renesas' Overvoltage Protected (OVP) Transceivers
PDF474 KB
Application Note
R15AN0011: FAQs: RS-485 Transceivers
PDF366 KB
Application Note
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses
PDF178 KB
Application Note
AN1991: Isolating RS-485 Interfaces with High-Speed Digital Optocouplers
PDF513 KB
Application Note
AN1990: RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles
PDF826 KB
Application Note
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses
PDF443 KB
Application Note
AN1986: External Fail-Safe Biasing of RS-485 Networks
PDF582 KB
Application Note
AN1989: RS-422 vs RS-485: Similarities and Key Differences
PDF440 KB
Application Note
AN1976: Important Transient Immunity Tests for RS-485 Networks
PDF338 KB
Application Note
AN1977: Transient Voltage Suppressors: Operation and Features
PDF365 KB
Application Note
AN1980: Ground Potential Differences: Origin and Remedies
PDF375 KB
Application Note
Transceivers Brochure
PDF2.95 MB
Brochure
PLC21035 - End of Life Notice
PDF1.17 MB
End Of Life Notice
TB506: Functional Principles of RS-485 Drivers and Receivers
PDF156 KB
Other
TB511: The Unit Load Concept
PDF253 KB
Other
TB508: Dual Protocol Applications: Programmable vs Standard Transceivers
PDF359 KB
Other
TB507: Dual Protocol Transceivers Simplify Interface Design
PDF580 KB
Other
RS-485: Transmitting Full-Duplex Data over Single Twisted-Pair Cable
PDF438 KB
Report
TB509: Detecting Bus Signals Correctly with Failsafe Biased RS-485 Receivers
PDF266 KB 简体中文
Technical Brief
R70TB0002: Understanding the Differences in ESD Device-Level Testing
PDF188 KB
Technical Brief
TB513: Designing a 3-Wire, Half-Duplex, Dual Protocol Interface Using the ISL3330 and ISL3331
PDF328 KB
Technical Brief
How to Simplify Industrial PC Interfaces
PDF920 KB 简体中文
White Paper
Dual Protocol Transceivers Ease the Design of Industrial Interfaces
PDF918 KB 简体中文
White Paper

Design & Development

Software Downloads

Title Type Date
PLC21035 - End of Life Notice
PDF1.17 MB
End Of Life Notice

ECAD Models

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    Part Number
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    ISL33334EIAZ
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    		SSOP Tube 705
    ISL33334EIAZ-T
    block_flippedObsolete
    memory
    spa
    view_in_ar
    		SSOP Reel 1000
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