Hashing output exclusive-OR driver with precharge

Details Hashing output exclusive-OR driver with precharge Hashing output exclusive-OR driver with precharge

1990-12-18

1992-05-26

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307451, 307452, H03K 1921, H03K 1920

Patent

active

051171333

ABSTRACT:
A circuit which performs a hashing (exclusive OR) function and has a high drive output for driving large capacitive loads. The invention incorporates a hashing function into an output driver, such as address driver, by incorporating a pull-down circuit into the output driver which is responsive to the respective inputs to be hashed together. A very short setup time for the inputs and a very fast evaluation of the hashing function is made possible in accordance with the invention by precharging the pull-down circuit before the inputs are received. The pull-down circuit is arranged such that a high output is outputted only when both of the input signals in a discharge path are of the same logic level. The resulting system is not limited by slow evaluation of the hashing function and thus has improved performance.

REFERENCES:
patent: 4342927 (1982-08-01), Hull
patent: 4562365 (1985-12-01), Redfield
patent: 4575648 (1986-03-01), Lee
patent: 4646306 (1987-02-01), Davis et al.
patent: 4808855 (1989-02-01), Lloyd
patent: 4831285 (1989-05-01), Gaiser
patent: 4974241 (1990-11-01), McClure et al.

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