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ADM823 Supervisory Circuit with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23

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. Applications

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.

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Reference Materials

• Product Selection Guide：ADI Complementary Parts Guide - Supervisory Devices and DSP Processors
• Product Selection Guide：Supervisory Devices Complementary Parts Guide for Altera FPGAs
• Product Selection Guide：Supervisory Devices Complementary Parts Guide for Xilinx FPGAs
• Solutions Bulletins & Brochures：Voltage Monitoring Products Applications Guide