2-bit bidirectional 400-kHz I2C/SMBus voltage level translator

The PCA9306H device is a dual bidirectional

I2C and SMBus voltage-level translator with an enable (EN) input, and

is operational from 1.2V to 3.3V VREF1 and 1.8V to 5.5V

VREF2.

The PCA9306H device allows bidirectional voltage

translations between 1.2V and 5V, without the use of a direction pin. The low

ON-state resistance (RON) of the switch allows connections to be made

with minimal propagation delay. When EN is high, the translator switch is ON, and

the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing

bidirectional data flow between ports. When EN is low, the translator switch is off,

and a high-impedance state exists between ports.

In addition to voltage translation, the PCA9306H

device can be used to separate a 400kHz bus from a 100kHz bus by

controlling the EN pin to disconnect the slower bus during fast-mode

communication.