Voltage Supervisor, 1V - 5.5V Supply, 3.15V Threshold, 350ms Delay, Active-Low, SOT-23-3 - 

The MCP130T-315I/TT is a Supervisor Circuit with active-low open-drain output. The voltage supervisory device designed to keep a microcontroller in reset until the system voltage has reached the proper level and stabilized. It also operates as protection from brown-out conditions when the supply voltage drops below a safe operating level. It will assert the RESET signal whenever the voltage on the VDD pin is below the trip-point voltage.