Oscillator signal detect circuit

Details Oscillator signal detect circuit Oscillator signal detect circuit

1984-02-13

1986-04-15

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307200B, 307453, 307471, 307481, 328 63, H03K 17687

Patent

active

045830134

ABSTRACT:
A circuit for use on an integrated circuit chip for detecting the operative connection of a crystal used to control an on-chip crystal controlled oscillator, which generates a cyclical clock signal, by detecting the presence or absence, respectively, of the cyclical clock signal and for providing an output control signal in response thereto to an on-chip terminal pad control circuit which automatically enables an on-chip terminal pad to be utilized as a clock signal output terminal pad if the cyclical clock signal presence is detected or as a clock signal input terminal pad otherwise. Also, a method of automatically switching the function of a terminal pad on an integrated circuit chip to function as a clock signal output terminal pad or as a clock signal input terminal pad in accordance with detecting the existence or non-existence of a cyclical clock signal generated on-chip.

REFERENCES:
patent: 3986046 (1976-10-01), Wunner
patent: 4061975 (1977-12-01), Sugai
patent: 4117348 (1978-09-01), Newman
patent: 4233524 (1980-11-01), Burdick
patent: 4352995 (1982-10-01), Yoshida et al.
patent: 4426713 (1984-01-01), Shimizu et al.
patent: 4504745 (1985-03-01), Spence et al.

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