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.
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| Number of supplies monitored | 1 |
| Threshold voltage 1 (typ) (V) | 2.93 |
| Features | Undervoltage monitor only |
| Reset threshold accuracy (%) | 5 |
| Iq (typ) (mA) | 0.015 |
| Output driver type/reset output | Active-low, Push-Pull |
| Time delay (ms) | 240 |
| Supply voltage (min) (V) | 1.2 |
| Supply voltage (max) (V) | 5.5 |
| Rating | Catalog |
| Watchdog timer WDI (s) | None |
| Operating temperature range (°C) | -40 to 105 |
| SOT-23 (DBZ) | 3 | 6.9204 mm² 2.92 x 2.37 |
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