Power-on reset circuit

Details Power-on reset circuit Power-on reset circuit

1991-03-12

1992-07-14

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307307, 307350, 3072961, 3072966, G11C 1100, H07K 301

Patent

active

051305690

ABSTRACT:
A power-on reset circuit produces a momentary signal when the operating potential increases above a first threshold and when the operating potential decreases below a second threshold level. In a preferred embodiment, the circuit includes first and second IGFETs of first conductivity having their conduction paths connected in series between a positive operating terminal and a first node and third and fourth IGFETs of second conductivity having their conduction paths connected in series between the first node and a negative operating terminal. An inverter is connected at its input to the first node. The output of the inverter is coupled via a first feedback network to the intersection of the conduction paths of the third and fourth IGFETs to control the voltage level at which the third IGFET conducts when power ramps up. The output of the inverter is also coupled via a second feedback network to the intersection of the conduction paths of the first and second IGFETs to control the voltage level at which the second IGFET conducts when power ramps down.

REFERENCES:
patent: 4300065 (1981-11-01), Remedi et al.
patent: 4446381 (1984-05-01), Dalrymple
patent: 4658156 (1987-04-01), Hashimoto
patent: 4812679 (1989-03-01), Mahabadi
patent: 4983857 (1991-01-01), Steele

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