ft809 The ft809 series are power supply supervisory circuits used to monitor the supply change in microprocessors and digital systems. The ft809 series provide a reset to the microprocessors during system power-up, power-down and brown-out conditions. The ft809 is designed to monitor the VCC supply voltage and assert a reset signal whenever the voltage declined below the preset threshold. The reset signal remains for at least 140ms after VCC has risen above the threshold. The ft809 provides an active-low reset output. The ft809 series are optimized to reject fast transient glitches on the VCC line. Low power supply current of 10μA makes the ft809 more suitable for battery-powered applications. The ft809 series are available in SOT23-3 package. Features ·Precision monitoring of 2.63V/ 2.93V/ 3.08V ·Fully specified over temperatures ·140ms min. Power-On-Reset pulse width ·10μA low supply current ·Power supply transient immunity ·Package: SOT23-3(2.9mm x 2.8mm)        Product Brief       DataSheet        Application Note