Power-on reset circuit

Details Power-on reset circuit Power-on reset circuit

2005-12-06

2005-12-06

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

06972602

ABSTRACT:
A power-on reset circuit comprises a power supply voltage detection circuit that detects a rise of a power supply voltage and that changes a logic level of a first internal node; a capacitor charge/discharge circuit that charges and discharges a capacitor according to the first internal node level and that in an event that the power supply voltage is reduced, discharges the capacitor to follow the event; and a reset pulse generation circuit that before the power supply voltage rises higher than the predetermined voltage, outputs a first output voltage to an output node and that after the power supply voltage has risen higher than the predetermined voltage, outputs a second output voltage to the output node upon detecting that a charge level of the capacitor has become higher than a charge level detection voltage.

REFERENCES:
patent: 4697097 (1987-09-01), Rusznyak
patent: 4812679 (1989-03-01), Mahabadi
patent: 6084446 (2000-07-01), Chen et al.
patent: 6239630 (2001-05-01), Bowers et al.
patent: 6-196989 (1994-07-01), None
patent: 11-68539 (1999-03-01), None

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