The LM809M3-2.63/NOPB from Texas Instruments is a microprocessor supervisory circuit that monitors the power supplies in digital systems. It provides a reset signal for the microprocessor during power-up, power-down, and brown-out conditions, ensuring system protection. The reset timeout period is approximately 240ms, and the reset output remains operational with VCC as low as 1V. The LM809M3-2.63/NOPB has a low supply current of 17µA (typical) and is available in the 3-pin SOT-23 package. It is RoHS compliant and operates efficiently from -40°C to +85°C. This product has a manual reset input and an active-low open-drain RESET output, providing maximum design flexibility.