DSP, Micros & Memory

Ultra-low-voltage supervisory circuits

9 May 2001 DSP, Micros & Memory

The Maxim MAX6821-MAX6825 microprocessor (µP) supervisory circuits in SOT23 package offer reset thresholds capable of monitoring system voltages from +1,8 to +5,0 V. Whenever a supply voltage falls below the reset threshold, the reset output asserts and remains asserted for at least 140 ms after the voltage exceeds the reset threshold. Nine factory preset thresholds of +4,63, +4,38, +3,08, +2,63, +2,32, +2,19, +1,67 and +1,58 V are available.

Other features include a watchdog timer (MAX6821-MAX6824) that detects code execution error and a manual reset input (MAX6821/6822/6823/6825) that allows for a reset without the power supply falling below the reset threshold.

These devices are available with three reset output options, which include an active-low, push-pull output (MAX6823/6824/6825), an active-high, push-pull output (MAX6821/6824/6825) and an active-low, open-drain output (MAX6822).


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