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MCP809 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MCP809 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 7 page  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 micropro- cessor during power-up, power-down and brown-out condi- tions. The function of the MCP809/810 is to monitor the V CC 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 V CC 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 V CC≥1V n Low Supply Current, 15µA typ. n Power supply transient immunity Applications n Microprocessor Systems n Computers n Controllers n Intelligent Instruments n Portable/Battery-Powered Equipment n Automotive Typical Application Circuit 20022301 Connection Diagram 20022302 ( ) are for MCP810 June 2001 © 2001 National Semiconductor Corporation DS200223 www.national.com |
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