ADM824
Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23
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Overview
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)
- 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.
APPLICATIONS
- Microprocessor systems
- Computers
- Controllers
- Intelligent instruments
- Portable equipment
Product Lifecycle
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.
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Design Resources
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| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| ADM824LYRJZ-REEL7 | Material Declaration | Reliability Data | 5-Lead SOT-23 | |
| ADM824RYKSZ-REEL7 | Material Declaration | Reliability Data | 5-Lead SC70 | |
| ADM824SYKSZ-REEL7 | Material Declaration | Reliability Data | 5-Lead SC70 | |
| ADM824SYRJZ-REEL7 | Material Declaration | Reliability Data | 5-Lead SOT-23 | |
| Wafer Fabrication Data |
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