The TCA39416 has an OE input that is used to disable the device by setting OE low, which prevents any signals from propagating across the device. This pin is referenced to the V_CCA supply. The rise and fall time accelerators and the internal pull-up resistors are also disabled. The disable time (t_dis) indicates the delay between the time when OE goes low and when the outputs are disabled (Hi-Z). The enable time (t_en) indicates the amount of time the user must allow for the one-shot circuitry to become operational after OE is taken high.