Power Electronics / Power Management


Ultralow-voltage µP supervisory circuits

29 August 2001 Power Electronics / Power Management

The Maxim MAX6821-MAX6825 microprocessor (µP) supervisory circuits 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 V, +4,8 V, +3,08 V, +2,93 V, +2,63 V, +2,32 V, +2,19 V, +1,67 V, and +1,58 V are available. Other features include a watchdog timer (MAX6821-MAX6824) that detects code execution error and a manual reset input (MAX6821/2/3/5) 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 (MAX6823/4/5), an active-high, push-pull output (MAX6821/4/5), and an active-low, open-drain output (MAX6822). All devices come in 5-pin SOT23.



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