Voltage Detector ICs provide basic voltage monitoring and reset timing for power-on resets.
The STM1061 low power voltage detector monitors the supply input. When the power supply falls below a specified trip point threshold, the output is forced low and remains asserted as long as the VCC input remains below the threshold voltage plus the hysteresis.

Power Supply Transient Immunity
Guaranteed OUT Assertion Down to VCC =0.7V
Operating Temperature –40 to 85 C.
Factory-trimmed Voltage Thresholds in 0.1V Increments from 1.6 to 5.5V
Operating Voltage 0.7 to 6.0V
±2% Voltage Threshold Accuracy
Low Supply Current of 0.9μA (typ)
Available in SOT23-3 and SOT323-3 (SC70-3) packages
Open Drain Output

Microprocessor Supply Voltage Supervisory & Reset Circuits

Power supply voltage monitoring and supervisory circuits for use in desktop, laptop and notebook computers, test and measurement instruments, portable battery-powered equipment and multiple-output power supplies.

Supply Voltage Detector
Supply Voltage Supervisor
Power Supply Supervisor
Microprocessor Supervisory
Microprocessor Voltage Supervisor
Microcontroller Reset Circuit