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I2C Multiplexers/Switches

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Our vast portfolio of I2C logic products includes a selection of multiplexers and switches for connecting an upstream I2C-bus to any combination of downstream I2C buses.

Multiplexers (muxes) and switches fan the input I2C/ SMBus signals to two, four or eight downstream channels of SCx/SDx pairs. Control is performed directly through the I2C/ SMBus, so there’s no need for an additional control pin. The muxes select one downstream channel at a time; the switches can select one or more. Some devices have an external active-low hardware reset pin (RESET). If the bus locks up or communication with the controller is interrupted, the RESET pin can be used to reset the downstream channels to their default values (“not selected”). These I2C Multiplexers/Switches work with I2C interfaces for applications such as: fault isolation, address conflict, level translation or broadcast communication.

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I2C Multiplexers/Switches Portfolio

P3S0200GM

I3C or I2C 2:1 or 1:2 mux with hardware select pin allowing bus voltage up to 5.5 V

PCA9541

2-to-1 I2C-bus controller selector with interrupt logic and reset

PCA9542A

2-channel I2C-bus multiplexer and interrupt logic

PCA9544A

4-channel I2C-bus multiplexer with interrupt logic

PCA9546A

4-channel I2C-bus switch with reset

PCA9548A

8-channel I2C-bus switch with reset

PCA9847

8-channel ultra-low voltage, Fm+ I2C-bus multiplexer with reset

PCA9849

4-channel ultra-low voltage, Fm+ I2C-bus multiplexer with reset

PCA9540B

2-channel I2C-bus multiplexer

PCA9541A

2-to-1 I2C-bus controller selector with interrupt logic and reset

PCA9543A_43B

2-channel I2C-bus switch with interrupt logic and reset

PCA9545A_45B_45C

4-channel I2C-bus switch with interrupt logic and reset

PCA9547

8-channel I2C-bus multiplexer with reset

PCA9846

4-channel ultra-low voltage, Fm+ I2C-bus switch with reset

PCA9848

8-channel ultra-low voltage, Fm+ I2C-bus switch with reset

Multiplexer and Switch Functions

Understand the difference between a multiplexer and a switch.

    Multiplexer and Switch Functions IMG

    Additional Documents

    NXP System Management I2C, I3C and SPI Selector Guide

    Selector guide of interface components for all your design needs.

    Read the selector guide

    Solutions Around the Core – Analog, Interfaces and NFC

    Discover other solutions we offer for your designs.

    Read the brochure

    Add Design Flexibility with Multichannel I2C/SMBus Muxes and Switches

    Designed for systems that use multiple I2C/SMBus devices with identical addresses.

    Read the fact sheet

    I3C Switch with Hardware Select and Enable

    The P3S0200 is ideally suited for the switching of high-speed I3C-bus signals in computing and server applications, such as servers, workstations, and notebooks that have limited I3C-bus controller ports.

    Read the fact sheet

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