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The TPS3600 family of supervisory circuits monitor and control processor activity. In case of power-fail or brownout conditions, the backup-battery switchover function of TPS3600 allows to run a low-power processor and its peripherals from the installed backup battery without asserting a reset beforehand.

During power on, RESET is asserted when the supply voltage (V_DD or V_BAT) becomes higher than V_res. Thereafter, the supply voltage supervisor monitors V_OUT and keeps RESET output active as long as V_OUT 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. This delay timer starts its time-out, after V_OUT has risen above the threshold voltage (V_IT). In case of a brownout or power failure of both supply sources, a voltage drop below the threshold voltage (V_IT) get detected and the output becomes active (low) again.

The product spectrum is designed for supply voltages of 2 V, 2.5 V, 3.3 V, and 5 V. The circuits are available in a 14-pin TSSOP package. They are characterized for operation over a temperature range of -40°C to 85°C.