Logic signal level translation apparatus having very low dropout

Details Logic signal level translation apparatus having very low dropout Logic signal level translation apparatus having very low dropout

1996-01-03

1998-05-05

Westin, Edward P.

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326 68, 326 81, 326 53, 326 34, H03K 190175, H03K 19094

Patent

active

057480109

ABSTRACT:
A logic signal level translation method and apparatus having very low dropout with respect to the powering rails and having a tri-state mode of operation allowing the output terminal to be driven to voltages beyond the highest supply voltage coupled thereto without significant power dissipation within the circuit. The output circuit includes well or body snatching devices which are controlled to assure that the wells of the output devices are able to follow extremes in voltage of the output terminal without biasing to conduction a PN junction of one or more of the output devices. A preferred embodiment is disclosed.

REFERENCES:
patent: 4469959 (1984-09-01), Luke et al.
patent: 4847522 (1989-07-01), Fuller et al.
patent: 4958091 (1990-09-01), Roberts
patent: 5414314 (1995-05-01), Thurber, Jr.
patent: 5436585 (1995-07-01), DiMarco
patent: 5574389 (1996-11-01), Chu

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