The PCA9546A is a quad bidirectional translating switch controlled via the I2C bus. It features 1.8V, 2.5V, 3.3V and 5V support, low standby current, I2C bus and SMBus compatibility, 5.5V tolerant inputs, three address pins, 0 to 400kHz clock frequency, I2C bus channel selection, ESD protection, low RON switches, no glitch on power up and hot insertion.
The PCA9546A is a quad bidirectional translating switch with reset function, supporting I²C and SMBus buses. It offers four independent channels, each selectable via the I²C control register, and includes active‑low reset, low standby current, and 5.5‑V tolerant I/O.
The document lists ordering information, package options, electrical ratings, recommended operating conditions, and mechanical dimensions, along with detailed pin functions and timing diagrams for bus operation.
| Supply voltage range (absolute maximum) | 0.5 V – 7 V |
|---|---|
| Number of channels | 4 |
| Clock frequency | 0 – 400 kHz |
| Input voltage tolerance | 5.5 V tolerant inputs |
| Operating temperature range | -40 °C – 85 °C |
| Storage temperature range | -65 °C – 150 °C |
The absolute maximum supply voltage range is 0.5 V to 7 V, while the recommended operating range is 2.3 V to 5.5 V.
The RESET pin is an active‑low input that resets the I²C state machine and deselects all channels when asserted.
The device supports I²C clock frequencies up to 400 kHz.