The ADM709 series Power Supply Monitor which generates a system reset during power-up, power-down and brownout conditions. When VCC falls below the reset threshold, RESET goes low and holds the µP in reset. On power-up the RESET output is held low for 140ms after VCC rises above the threshold. The RESET output remains operational with VCC as low as 1V. The actual reset voltage threshold is found in the data sheet.