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ADM824:  Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23

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


  • 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)
  • Push-pull output stages
    RESET (ADM823)
    RESET, RESET (ADM824/ADM825)
  • Watchdog timer with 1.6 sec timeout (ADM823, ADM824)
  • Low power consumption (5 μA)
  • See Data Sheet for Additional Information

Pin Configuration Diagram for ADM824

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Price, packaging, availability

ADM824 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADM824LYRJZ-REEL7 Status: Production SOT23 5/6/8 Leads 5 Ind Reel, 3000 - $0.51 Y  Material Info PCN Purchase Sample
ADM824RYKSZ-REEL7 Status: Production SC-70 5 Ind Reel, 3000 - $0.55 Y  Material Info Notify Me Purchase Sample
ADM824SYKSZ-REEL7 Status: Production 5 ld SC70 5 Ind Reel, 3000 - $0.51 Y  Material Info Notify Me Purchase Sample
ADM824SYRJ-REEL7 Status: Contact ADI SOT23 5/6/8 Leads 5 Ind Reel, 3000 - - N  Material Info PCN/PDN Contact ADI
ADM824SYRJZ-REEL7 Status: Production SOT23 5/6/8 Leads 5 Ind Reel, 3000 - $0.55 Y  Material Info Notify Me Purchase Sample
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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