MCP809 Active Low 3-Pin Reset IC |


Active Low 3-Pin Reset IC



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.


  • 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)
  • Specified RESET Output Valid for VCC≥1V
  • Low Supply Current, 15µA typical
  • Power supply transient immunity

All trademarks are the property of their respective owners.


Compare all products in Supervisor & reset ICs Email Download to Excel
Part number Order Threshold voltage 1 (Typ) (V) Number of supplies monitored VCC (Max) (V) VCC (Min) (V) Output driver type/reset output Time delay (ms) Features Rating Operating temperature range (C) Watchdog timer WDI (sec)
MCP809 Order now 2.93     1     5.5     1.2     Active-low
240     Ease-of-use     Catalog     -40 to 105     None