Oscillator circuit and semiconductor integrated circuit device

Details Oscillator circuit and semiconductor integrated circuit device Oscillator circuit and semiconductor integrated circuit device

2006-04-18

2006-04-18

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S1160FE, C331S185000

Reexamination Certificate

active

07030710

ABSTRACT:
An oscillator circuit includes a crystal oscillating circuit for generating a clock signal using a crystal resonator, an RC oscillating circuit for generating the clock signal using an RC circuit, a control signal generation circuit for bringing one of terminals for the external component to a ground potential in response to input of a reset signal, changeover switches for connecting the crystal oscillating circuit to the crystal resonator in parallel upon receipt of a first signal and connecting the RC oscillating circuit to a resistive element in the RC circuit in response to a second signal, and a selection signal generation circuit connected to the other terminal of the external component upon receipt of the reset signal, for transmitting the first signal to the changeover switches when a current flowing through the external component is smaller than a predetermined value and transmitting the second signal to the changeover switches when the current is equal to or more than the predetermined value.

REFERENCES:
patent: 6408353 (2002-06-01), Sakairi
patent: 6927641 (2005-08-01), Terasawa et al.
patent: 1-261007 (1989-10-01), None
patent: 2000-112921 (2000-04-01), None

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