Power-on detecting circuit

Details Power-on detecting circuit Power-on detecting circuit

1992-09-16

1994-12-20

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

327143, 327546, G08B 2100

Patent

active

053749235

ABSTRACT:
A power-on detecting circuit includes a capacitance for sensing power-on, and a signal generating circuit which responds to the output node potential of capacitance by generating a signal indicative of the power-on. The signal generating circuit includes inverter circuits forming a latch circuit. The power-on detecting circuit includes a control circuit, which adjusts driving capabilities of inverter circuits at the power-on and power-off, or an activation control circuit, which delays the activation timing. The control circuit differentiates the driving capability of the latch circuit formed of inverter circuits at the power-on from that at the power-off. Activation control circuit activates signal generating circuit at the time the potential of the output node ND10 of a sensing circuit rises above the potential of the output node of signal generating circuit.

REFERENCES:
patent: 4818904 (1989-04-01), Kobayashi
patent: 4902907 (1990-02-01), Haga et al.
patent: 5151614 (1992-09-01), Yamazaki et al.
patent: 5172012 (1992-12-01), Ueda
patent: 5177375 (1993-01-01), Ogawa et al.

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