ADM825
Supervisory Circuit 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)
- 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.
APPLICATIONS
- Microprocessor systems
- Computers
- Controllers
- Intelligent instruments
- Portable equipment
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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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| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| ADM825LYRJZ-R7 | Material Declaration | Reliability Data | 5-Lead SOT-23 | |
| ADM825RYRJZ-R7 | Material Declaration | Reliability Data | 5-Lead SOT-23 | |
| ADM825SYKSZ-R7 | Material Declaration | Reliability Data | 5-Lead SC70 | |
| ADM825SYRJZ-R7 | Material Declaration | Reliability Data | 5-Lead SOT-23 | |
| ADM825TYKSZ-R7 | Material Declaration | Reliability Data | 5-Lead SC70 | |
| ADM825TYRJZ-R7 | Material Declaration | Reliability Data | 5-Lead SOT-23 | |
| ADM825ZYKSZ-R7 | Material Declaration | Reliability Data | 5-Lead SC70 | |
| Wafer Fabrication Data |
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