Tri-state devices having exclusive gate output control

Details Tri-state devices having exclusive gate output control Tri-state devices having exclusive gate output control

1996-11-01

1998-06-16

Hudspeth, David R.

Electronic digital logic circuitry

Tri-state

326 55, 326 58, H03K 1716

Patent

active

057676968

ABSTRACT:
Tri-state devices having exclusive gate output control include a tri-state device having first and second inputs and a tri-state output, a normally-off transistor connected in series between the tri-state output and a first reference potential (e.g., VCC or VSS) and an exclusive gate (e.g., NOR, OR) having first and second inputs coupled to the first and second inputs of said tri-state device, respectively, and an output electrically coupled to a control electrode of said normally-off transistor so that the tri-state output becomes electrically connected through the normally-off transistor to the first reference potential whenever the first and second inputs of said tri-state device are at different logic potentials. However, the normally-off transistor is maintained in a nonconductive state to reduce power consumption whenever the output of the tri-state device is switched to VCC or VSS.

REFERENCES:
patent: 4749886 (1988-06-01), Hedayati
patent: 4928023 (1990-05-01), Marshall
patent: 4968903 (1990-11-01), Smith et al.
patent: 5296757 (1994-03-01), Koizumi
patent: 5334888 (1994-08-01), Bodas
patent: 5568062 (1996-10-01), Kaplinsky

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