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. Seven standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 3V supply voltages. 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 Computer...
National Semiconductor
