Fangtek Introduces ft809 Power-on Reset Circuit。 The ft809 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.    he 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 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 are available in SOT23-3 package。