The first smart I2C-bus multiplexer
Access I2C Slave devices that share two Masters. Protect I2C-bus messages from interruptions and bus traffic collisions.
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I2C Multiplexers/Switches
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 master 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.
Featured Products
| Part Number | Description | Inputs | Outputs | No. of Addresses | Datasheet | Order |
|---|---|---|---|---|---|---|
| PCA9540BDP | 2-channel I2C-bus multiplexer | 1 | 2 | 1 | PDF (355 kB) |
Buy |
| PCA9541APW | 2-to-1 I2C-bus master selector with interrupt logic and reset | 2 | 1 | 16 | PDF (378 kB) |
Buy |
| PCA9545APW | 4-channel I2C-bus switch with interrupt logic and reset | 1 | 4 | 12 | PDF (294 kB) |
Buy |
| PCA9546APW | 4-channel I2C-bus switch with reset | 1 | 4 | 8 | PDF (267 kB) |
Buy |
| PCA9548APW | 8-channel I2C-bus switch with reset | 1 | 8 | 8 | PDF (308 kB) |
Buy |
| PCA9846PW | 4-channel ultra-low voltage, Fm+ I2C-bus switch with reset | 1 | 4 | 16 | PDF (986 kB) |
Buy |
Multiplexer and Switch Functions
Understand the difference between a Multiplexer and a Switch.
What's New
System Management I2C and SPI Selector Guide 2019
Selector Guide of interface components for all your design needs.
Add design flexibility with multichannel I2C/SMBus muxes and switches
Designed for systems that use multiple I2C/SMBus devices with identical addresses, these multichannel devices enable I2C multiplexing, voltage level shifting, capacitive load sharing, and more.
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Multiplexer and Switch Functions