The PT7M3808 family of microprocessor supervisory circuits introduced by Diodes Incorporated is designed to monitor system voltages from 0.4V to 5.0V. With threshold accuracy from 0.5% and an adjustable delay time from 1.25ms to 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 centers to security systems.
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 PT7M3808 uses 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.
The delay time is 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 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.
The PT7M3808 family supervisory ICs are priced at $0.60 each in 1,000 piece quantities.