ADM6822

Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Open-Drain Reset Output

Obsolete

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Features

Precision Low Voltage Monitoring down to 1.8V
9 Reset Threshold Options: 1.58V to 4.63V
140ms (Min) Reset Timeout
Manual Reset Input
Reset Output Stages: Open-Drain Active-Low

Low Power Consumption (3µA)
Guaranteed Reset Output valid to V_CC=1V
Power Supply Glitch Immunity
Specified from -40°C to +125°C
5-Lead SOT-23 Package

Additional Details

The ADM6821-ADM6825 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as 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 means of 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.

Each part is available in a choice of 9 reset threshold options ranging from 1.58V to 4.63V. The reset and watchdog timeout periods are fixed at 140ms (min) and 1.6s (typ), respectively.

The ADM6821-ADM6825 are available in 5-lead SOT-23 packages and typically consume only 3µA, making them suitable for use in low power portable applications.