The TPS312x family of ultralow voltage processor supervisory circuits provides circuit initialization and timing supervision, primarily for DSP and processor-based systems.

During power-on, RESET is asserted when the supply voltage (V_DD) becomes higher than 0.75 V. Thereafter, the supply voltage supervisor monitors V_DD and keeps RESET output active as long as V_DD remains below the threshold voltage (V_IT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, t_d = 180 ms, starts after V_DD has risen above the threshold voltage (V_IT).

When the supply voltage drops below the threshold voltage (V_IT), the output becomes active (low) again. No external components are required.