Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Output switching noise reduction
Patent
1993-09-28
1995-07-04
Hudspeth, David R.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Output switching noise reduction
326 87, 326 17, H03K 1716
Patent
active
054303893
ABSTRACT:
An output circuit and a bus buffer semiconductor LSI circuit which have functions of high speed and low power consumption while suppressing generation of undershoot and ringing in an output signal. The output circuit includes a delay circut and a current injecting circuit. The current injecting circuit operates so that, when a voltage at an output terminal of the output circuit is changed from a first level to a second level lower than the first level, it supplies a current to an output terminal only for a period of time after the voltage of the output terminal reaches a predetermined level. As a result, the load driving capability of the output circuit can be made effectively small only for a period of time during which the current injection circuit supplies the current to the output terminal.
REFERENCES:
patent: 5153450 (1992-10-01), Ruetz
patent: 5166555 (1992-11-01), Kano
patent: 5296757 (1994-03-01), Koizumi
patent: 5329175 (1994-07-01), Peterson
patent: 5332932 (1994-07-01), Runaldue
patent: 5334889 (1994-08-01), Hisaka
Hitachi , Ltd.
Hudspeth David R.
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