Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Field-effect transistor
Patent
1997-10-27
1999-03-30
Tokar, Michael
Electronic digital logic circuitry
Function of and, or, nand, nor, or not
Field-effect transistor
326112, 326119, H03K 1920, H03K 19094
Patent
active
058894160
ABSTRACT:
A NAND gate including a pull-down circuit coupled to a pull-up circuit. The NAND gate is configured to drive an output signal to a high logic state at a substantially uniform slew rate regardless of the number of input signals that are in a low logic state. The pull-up circuit may include a plurality of load circuits each coupled to a corresponding one of the plurality of input signals, and a plurality of transistor circuits each comprising a plurality of transistors coupled in parallel with each other and coupled to a corresponding one of the plurality of input signals or a complement of a corresponding one of the plurality of input signals. The plurality of load circuits and the plurality of transistors may each include a p-channel MOS (PMOS) transistor. The NAND gate may be incorporated into a decoder of a synchronous or asynchronous input path circuit to generally reduce the setup and hold time window of the input path circuit.
REFERENCES:
patent: 3900742 (1975-08-01), Hampel et al.
patent: 4286174 (1981-08-01), Dingwall
patent: 4429375 (1984-01-01), Kobayashi et al.
patent: 4638187 (1987-01-01), Boler
patent: 4716308 (1987-12-01), Matsuo et al.
patent: 4736123 (1988-04-01), Miyazawa et al.
patent: 4791323 (1988-12-01), Austin
patent: 4857763 (1989-08-01), Sakurai et al.
patent: 4877978 (1989-10-01), Platt
patent: 4893281 (1990-01-01), Hashimoto
patent: 4978905 (1990-12-01), Hoff et al.
patent: 5057715 (1991-10-01), Larsen et al.
patent: 5136182 (1992-08-01), Fawal
patent: 5157284 (1992-10-01), O'Connell et al.
patent: 5187388 (1993-02-01), Moy
patent: 5274277 (1993-12-01), Chan
patent: 5305282 (1994-04-01), Choi
patent: 5386153 (1995-01-01), Voss et al.
patent: 5493530 (1996-02-01), Lee et al.
patent: 5526320 (1996-06-01), Zagar et al.
patent: 5552723 (1996-09-01), Shigehara et al.
patent: 5587964 (1996-12-01), Rosich et al.
patent: 5625302 (1997-04-01), Covino et al.
patent: 5654651 (1997-08-01), Kaneko et al.
Lovett (Applicant), Patent Application Ser. No. 08/958500, admitted prior art on p. 5, Oct. 1997.
Chang Daniel D.
Cypress Semiconductor Corporation
Tokar Michael
LandOfFree
Symmetrical nand gates does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Symmetrical nand gates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Symmetrical nand gates will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1217870