PCA9546ADR(UMW)

The UMW PCA9546 series is a 4-channel bidirectional data transfer switch controlled by the I²C bus. The upstream master selects one or more downstream slave devices via the SCL and SDA pins and performs the specified data transfer. The series supports any combination of downstream channel slave device selection. The series provides an active-low reset pin RESET. If the I²C bus of a downstream slave device becomes locked, pulling the RESET pin low resets the series device, deselecting the downstream slave device and releasing the locked I²C bus. The series allows upstream masters and downstream slave devices to transfer data across voltage domains. In this case, the supply voltage VCC of the series limits the minimum allowable pass-through voltage VPASS for upstream and downstream transfers. This feature allows upstream and downstream devices in 1.8V, 3.3V, and 5.0V voltage domains to interact with each other without additional protection. When using this feature, ensure that the I²C bus of each upstream and downstream channel is connected to its respective supply voltage via pull-up resistor RP. All pins of the series are rated at 5.5V.

Applications

• Servers
• Routers
• I²C devices with slave address conflicts

Key features

• Compatible with SMBus and I²C protocols
• Multi-channel bidirectional data transfer: supports 4 downstream slave devices
• Active-low reset pin RESET
• Slave address selection pins: 3 address select pins
• Cross-voltage-domain data transfer
• Low on-resistance, low quiescent current
• Supply voltage: 1.65V ~ 5.5V
• Hot-plug device support