The MCP809/810 microprocessor supervisory circuits can be used to monitor the power
supplies in microprocessor and digital systems. They provide a reset to the microprocessor during
power-up, power-down and brown-out conditions.
The function of the MCP809/810 is to monitor the VCC supply
voltage, and assert a reset signal whenever this voltage declines below the factory-programmed
reset threshold. The reset signal remains asserted for 240ms after VCC rises
above the threshold. The MCP809 has an active-low RESET output, while the
MCP810 has an active-high RESET output.
Seven standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and
3V supply voltages.
With a low supply current of only 15µA, the MCP809/810 are ideal for use in portable
equipment. The MCP809/MCP810 are available in the 3-pin SOT23 package.
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