Analog Devices Inc. ADM8323 & ADM8324 Supervisory Circuits

Analog Devices Inc. ADM8323/ADM8324 Supervisory Circuits monitor power supply voltage levels and code execution integrity in microprocessor-based systems. An on-chip watchdog timer checks for activity within a preset timeout window. A reset signal can also be asserted by an external push-button switch through a manual reset input.

The RESET output is either push-pull (ADM8323) or open-drain (ADM8324). A watchdog failure results in a low output on the RESET pin. A failure can be triggered either by a fast watchdog error (watchdog pulses too close together) or by a slow watchdog error (no watchdog pulse within the timeout period). This effectively gives a window in which to observe the watchdog pulse. The watchdog timeout is measured from the last falling edge of the watchdog input (WDI).

The ADM8323/ADM8324 are available in a 5-lead SOT-23 package and typically consume only 10μA, making them suitable for use in low power portable applications.


  • Reset Threshold 2.901V (minimum) to 2.959V at TA=25°C
  • Timeout 140ms (minimum)
  • Manual reset input
  • Open-drain or push-pull RESET outputs
  • Low power consumption
  • Specified over wide temperature range (-40°C to +125°C)
  • Qualified for automotive applications
  • 5-lead SOT-23 package


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

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Publicado: 2013-12-16 | Actualizado: 2023-01-13