ST STM1001 handbook
Datasheet
STM1001 Reset circuit is a low power reset circuit with precision monitoring of 3V, 3.3V and 5V supply voltages, open drain RST output, 30ms or 140ms reset pulse width(min), low supply current - 6μA(typ), guaranteed RST assertion down to VCC= 1.0V and –40 °C to 85 °C operating temperature(industrial grade).
