Features and Benefits

  • Precision 2.5 V to 5 V power supply monitor
  • 7 reset threshold options:
    2.19 V to 4.63 V
  • 140 ms (minimum) reset timeout
  • Manual reset input (ADM823, ADM825)
  • Low power consumption (5 μA)
  • Push-pull output stages 
    RESET (ADM823) 
    RESET, RESET (ADM824/ADM825)
  • Watchdog timer with 1.6 sec timeout (ADM823, ADM824)
  • See Data Sheet for Additional Information

Product Details

The ADM823 / ADM824 / ADM825 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. In addition to providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by an external push-button, through a manual reset input. The three parts feature different combinations of watchdog input, manual reset input, and output stage configuration, as shown in Table 1.

These parts are available in a choice of seven reset threshold options ranging from 2.19 V to 4.63 V. The reset and watchdog timeout periods are fixed at 140 ms (minimum) and 1.6 sec (typical), respectively.

The ADM823 / ADM824 / ADM825 are available in 5-lead SC70 and SOT-23 packages and typically consume only 5 μA, making them suitable for use in low power, portable applications.


  • Microprocessor systems
  • Computers
  • Controllers
  • Intelligent instruments
  • Portable equipment

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy

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