Programmable voltage supervisory circuit and method with...

Details Programmable voltage supervisory circuit and method with... Programmable voltage supervisory circuit and method with...

2005-01-18

2005-01-18

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S282000, C330S282000

Reexamination Certificate

active

06844709

ABSTRACT:
A programmable voltage supervisory circuit and method with minimum programming pins and low quiescent current is provided to monitor a supply voltage, by which only one programming pin can configure three voltage levels for the threshold voltage to be compared to the supply voltage. The programming pin is connected with a voltage select signal that is defined to be high, low or floating states each determines a setting voltage among three levels corresponding to the three threshold voltages, respectively, by a voltage select circuit. A sample/hold circuit in combination with a switch arrangement is further connected to the voltage select circuit such that the programmable voltage supervisory circuit is only operationable during the duty of a clock and thereby to reduce the power consumption thereof by squeezing the duty.

REFERENCES:
patent: 6009022 (1999-12-01), Lee et al.
patent: 6044000 (2000-03-01), Twardzik
patent: 6124743 (2000-09-01), Yang
patent: 6226193 (2001-05-01), Bayer et al.
patent: 6366484 (2002-04-01), Jin
patent: 6462621 (2002-10-01), Charles et al.

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