ADM823

Supervisory Circuit with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23
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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.

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

Product Lifecycle

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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.

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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.

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Most Helpful Review

by lt2013
It was exactly what we needed for a high-temperature environment. Analog Devices products have never been great performers under temperature for us due to the internal temperature cut-off safety measures AD puts in place for many of their parts. This product was one of the few that didn't have this and so it performed admirably under high-temperatures.

All Reviews

by lt2013, 11 Sep 13
Performed well under temperature stress
It was exactly what we needed for a high-temperature environment. Analog Devices products have never been great performers under temperature for us due to the internal temperature cut-off safety measures AD puts in place for many of their parts. This product was one of the few that didn't have this and so it performed admirably under high-temperatures.
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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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