SCPS221G October 2010 – November 2018 TCA9406
The TCA9406 has an OE input that is used to disable the device by setting OE low, which places all I/Os in the Hi-Z state. When TCA9406 is disabled, the internal pull up resistors are also disabled meaning if no external pull up resistors are present then the SDA/SCL lines will be left floating. The disable time (tdis) indicates the delay between the time when OE goes low and when the outputs are disabled (Hi-Z). The enable time (ten) indicates the amount of time the user must allow for the one-shot circuitry to become operational after OE is taken high.