Microprocessor supervisory circuit monitors system voltage with programmable delay

February 14, 2018 // By Julien Happich
Offered in fixed-threshold versions for standard voltage rails between 0.9V and 5V, and with an adjustable threshold version down to 0.4V, the Diodes' PT7M3808 microprocessor supervisory circuits use a precision reference to provide a 0.5% negative-going input threshold accuracy when monitoring voltages up to 3.3V and 1% accuracy at voltages from 3.3V to 5.0V.

Delay time can be adjusted from 1.25ms to 10ms by connecting an external capacitor to the CT pin; a longer 20ms delay can be achieved by disconnecting the CT pin, while a 300ms delay is possible by connecting the CT pin to VDD with a resistor. The small form-factor devices enable power-on reset functionality for microprocessor and other digital systems while consuming minimal power, with a very low quiescent current, typically 2.8A. Available in SOT26 and DFN2020-6 packages, the PT7M3808 takes up very little board space for both new and drop-in replacement designs.
Diodes - www.diodes.com


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