The TLV323x-Q1 devices have an internal Power-on-Reset (POR) circuit for known start-up or power-down conditions. While the power supply (V+) is ramping up or ramping down, the POR circuitry will be activated for up to 4us after the V_POR of 2V is crossed. When the supply voltage is equal to or greater than the minimum supply voltage, and after the delay period, the comparator output reflects the state of the differential input (V_ID).

For the TLV3231-Q1 devices, the output is held low during the POR period (t_on).

Figure 6-3 Power-On Reset Timing Diagram