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Microprocessor circuit monitors voltage with programmable delay

16th February 2018

Lanna Deamer

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Datasheet

The PT7M3808 family of microprocessor supervisory circuits introduced by Diodes Incorporated monitors system voltages from 0.4-5.0V. With threshold accuracy from 0.5% and an adjustable delay time from 1.25-10ms, these small form-factor devices enable power-on reset functionality for microprocessor and other digital systems while consuming minimal power.

Applications include notebook and desktop computers, and battery-powered portable equipment for markets ranging from data centres to security systems.

Offered in fixed-threshold versions for standard voltage rails between 0.9-5V, and with an adjustable threshold version down to 0.4V, the PT7M3808 uses a precision reference to provide a 0.5% negative-going input threshold accuracy when monitoring voltages up to 3.3V and one percent accuracy at voltages from 3.3-5.0V.

The delay time is adjusted from 1.25-10ms 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 PT7M3808 has a very low quiescent current, typically 2.8A, making it well suited for battery-powered applications. Available in SOT26 and DFN2020-6 packages, the PT7M3808 takes up very little board space for both new and drop-in replacement designs.