MCP810

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 200...