Semiconductor circuit for use in timer circuit or oscillator...

Details Semiconductor circuit for use in timer circuit or oscillator... Semiconductor circuit for use in timer circuit or oscillator...

2005-10-28

2009-02-03

Kinkead, Arnold (Department: 2817)

Oscillators

Relaxation oscillators

C331S111000, C331S175000, C331S03600C, C331S135000

Reexamination Certificate

active

07486151

ABSTRACT:
In a timer circuit of a semiconductor circuit including a current source driven by a power supply voltage, the current source outputs a current dependent on the power supply voltage, and outputs a reference voltage obtained when the power supply voltage is dropped by a predetermined drop voltage. A capacitor is charged with electric charges by the current outputted from the current source. The comparator compares a voltage across the capacitor with the reference voltage from the current source, and outputs an output signal when a voltage across the capacitor is equal to or higher than the reference voltage. The timer circuit outputs an output signal after a delay time, from a timing when supply of the power supply voltage is started, to a timing when the voltage across the capacitor rises substantially in proportion to an elapsed time by charging the capacitor and reaches the reference voltage.

REFERENCES:
patent: 5841827 (1998-11-01), Chevallier
patent: 6326859 (2001-12-01), Goldman et al.
patent: 6441463 (2002-08-01), Yasuda
patent: 6856566 (2005-02-01), Takahashi et al.
patent: 2002-16254 (2002-01-01), None
patent: 2002-117671 (2002-04-01), None
Korean Office Action dated Apr. 20, 2007.
German Office Action dated Dec. 18, 2007 with English Translation.

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