Power supply voltage monitoring circuit

Details Power supply voltage monitoring circuit Power supply voltage monitoring circuit

1990-01-31

1991-09-10

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

328146, 307364, G08B 2100

Patent

active

050477510

ABSTRACT:
A power supply voltage monitoring circuit for use in a semiconductor circuit which is used with a plurality of power supply systems and is operable by switching the high and low power supply voltages, includes at least two power supply lines, a reference voltage source, a first comparator, a second comparator and a switching transistor disposed between the first comparator and second comparator. The first comparator operates under a threshold value of a supply voltage which is an intermediate voltage between the high and low power supply voltages. The second comparator receives a voltage to be compared with a reference voltage supplied from the reference voltage source and the switching transistor changes, in response to an output from the first comparator, a voltage to be compared by the second comparator. An alarm signal indicating as to whether the supply voltage is normal or abnormal is obtained at an output of the second comparator.

REFERENCES:
patent: 4613770 (1986-09-01), Raab
patent: 4916570 (1990-04-01), Dale
"Three Voltage-Band Detectors" by J. L. VanFeldt, IBM technical disclosure bulletin, Jul. 1964.

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