Semiconductor device using complementary clock and signal input

Details Semiconductor device using complementary clock and signal input Semiconductor device using complementary clock and signal input

1998-05-13

2000-08-15

Zweizig, Jeffrey

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Clock or pulse waveform generating

327119, 327291, G06F 104

Patent

active

061042250

ABSTRACT:
A semiconductor device for generating first and second internal clocks complementary with each other from an external clock and usable for both a system of a type using a complementary clock and a system of a type generating a 180.degree. phase clock internally, is disclosed. A first clock input circuit (buffer) is supplied with a first external clock and outputs a first internal clock. A second clock input circuit (buffer) is supplied with a second external clock complementary with the first external clock and outputs a second clock. A 1/2 phase clock generating circuit generates a 1/2 phase shift signal 180.degree. out of phase with the first internal clock. A second external clock state detection circuit judges whether the second external clock is input to the second clock input buffer. A switch is operated to produce the second clock as the second internal clock when the second external clock is input and to produce the 1/2 phase shift signal as the second internal clock when the second external clock is not input, in accordance with the judgement at the second external clock state detection circuit.

REFERENCES:
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patent: 4648021 (1987-03-01), Alberkrack
patent: 4982116 (1991-01-01), Lee
patent: 5101127 (1992-03-01), Simpson
Patent Abstracts of Japan, vol. 014, No. 444, Sep. 21, 1990 of JP 02-174421, Nec Corporation, Jul. 5, 1990.
Patent Abstracts of Japan, vol. 013, No. 437, Sep. 29, 1989 of JP 01-164142, Fujitsu Limited, Jun. 28, 1989.
Patent Abstracts of Japan, vol. 010, No. 011, Jan. 17, 1986 of JP 60-173949, Fujitsu Kabushiki Kaisha, Sep. 7, 1985.

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