Output buffer providing testability

Details Output buffer providing testability Output buffer providing testability

1997-12-03

1999-11-30

Lefkowitz, Edward

Communications: electrical

Condition responsive indicating system

Specific condition

324 731, 326 63, 326 80, H03K 190185

Patent

active

059950102

ABSTRACT:
According to one embodiment of the present invention, an output buffer (200) includes a first output driver (86) and a second output driver (88). A first output cascode (80) coupled to the first output driver (86) protects the gate oxide of the first output driver (86) from voltage changes on the output (16). A second output cascode (84) coupled to the second output driver (88) protects the gate oxide of the second output driver (88) from voltage changes on the output (16). A level shifter (60) includes multiple cascode devices (66, 68, 70, 72) and switches the first output driver according to the values of a data input (12) and an enable input (14). A first testability device (202, 204, 206, 208) coupled to a cascode device (66, 68, 70, 72) of the level shifter (60) generates a current in response to failure of the cascode device (66, 68, 70, 72).

REFERENCES:
patent: 4656417 (1987-04-01), Kirkpatrick et al.
patent: 4967151 (1990-10-01), Barish et al.
patent: 5646550 (1997-07-01), Campbell, Jr. et al.
patent: 5764077 (1998-06-01), Andresen et al.
patent: 5818257 (1998-10-01), Villa

Affiliated with

Also associated with

Rating

Output buffer providing testability does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Output buffer providing testability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Output buffer providing testability will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1678337