Many applications need both an RS-232 and RS-485 serial port. The dual protocol devices integrate both transceivers into a single package. The single-port device can be programmed for either interface. The two-port configuration is very flexible as each port can be either protocol.

Both 3.3V and 5V supply options are available in SOIC and QFN package. The QFN package has additional features including a logic supply pin (VL) and selectable RS-485 data rates. The RS-232 data rate can operate up to 400kbps.

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Product Protocol Description Datasheet
ISL41334 Multiprotocol RS-485/422 and RS-232 ±15kV ESD Protected, 5V, Two Port, Dual Protocol (RS-232/RS-485) Transceivers pdf_icon_for_table.png

descriptionDocumentation

Title language Type Format File Size Date
Application Notes & White Papers
An Overview of Electromagnetic and Lightning Induced Voltage Transients Application Note PDF 677 KB
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses Rev.1.00 Application Note PDF 178 KB
How to Simplify Industrial PC Interfaces 简体中文 White Paper PDF 920 KB
Dual Protocol Transceivers Ease the Design of Industrial Interfaces 简体中文 White Paper PDF 918 KB
RS-485 Transceiver Tutorial 简体中文 White Paper PDF 246 KB
AN1991: Isolating RS-485 Interfaces with High-Speed Digital Optocouplers Application Note PDF 513 KB
AN1990: RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles Application Note PDF 826 KB
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses Application Note PDF 443 KB
AN1986: External Fail-Safe Biasing of RS-485 Networks Application Note PDF 582 KB
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E Application Note PDF 335 KB
AN1989: RS-422 vs RS-485: Similarities and Key Differences Application Note PDF 440 KB
AN1976: Important Transient Immunity Tests for RS-485 Networks Application Note PDF 338 KB
AN1977: Transient Voltage Suppressors: Operation and Features Application Note PDF 365 KB
AN1978: Surge Protection for Intersil's Standard RS-485 Transceivers Application Note PDF 369 KB
AN1979: Surge Protection simplified with Intersil's Overvoltage Protected (OVP) Transceivers Application Note PDF 500 KB
AN1980: Ground Potential Differences: Origin and Remedies Application Note PDF 375 KB
AN1378: Implementing a Three Pin, Half-Duplex, Dual Protocol (RS-232/RS-485) Interface Using The ISL81387 or ISL41387 Application Note PDF 339 KB
Other
R15ZZ0002: Calculating the Power Dissipation of an RS-485 Driver Other PDF 150 KB
R15ZZ0001: Calculating the Power Dissipation of an RS-422 Driver Other PDF 165 KB
TB506: Functional Principles of RS-485 Drivers and Receivers Other PDF 156 KB
TB509: Detecting Bus Signals Correctly with Failsafe Biased RS-485 Receivers Technical Brief PDF 300 KB
TB513: Designing a 3-Wire, Half-Duplex, Dual Protocol Interface Using the ISL3330 and ISL3331 Technical Brief PDF 328 KB
TB511: The Unit Load Concept Other PDF 253 KB
TB508: Dual Protocol Applications: Programmable vs Standard Transceivers Other PDF 359 KB
TB507: Dual Protocol Transceivers Simplify Interface Design Other PDF 580 KB