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Features
Precise monitoring of 3V, 3.3V, and 5V supply voltages
Fully specified over temperature
140ms min. Power-On Reset pulse width, 240ms typical Active-low RESET# Output (MCP809) Active-high RESET Output (MCP810)
Guaranteed RESET Output valid for VCC>=1V
Low Supply Current, 15µA typ.
Power supply transient immunity
Description 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.
Applications
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Automotive
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