MCP809/MCP810 3-Pin Microprocessor Reset Circuits
June 2001
MCP809/MCP810 3-Pin Microprocessor Reset Circuits
General ...
MCP809/MCP810 3-Pin Microprocessor Reset Circuits
June 2001
MCP809/MCP810 3-Pin Microprocessor Reset Circuits
General 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.
Features
n Precise monitoring of 3V, 3.3V, and 5V supply
voltages n Fully specified over temperature n 140ms min. Power-On Reset pulse width, 240ms typical Active-low RESET Output (MCP809) Active-high RESET Output (MCP810) n Guaranteed RESET Output valid for VCC≥1V n Low Supply Current, 15µA typ. n Power supply transient immunity
Applications
n n n n n n Microprocessor Systems Computers Controllers Intelligent Instruments Portable/Battery-Powered Equipment Automotive
Typical Application Circuit
Connection Diagram
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