High voltage tolerant CMOS input/output circuit

Details High voltage tolerant CMOS input/output circuit High voltage tolerant CMOS input/output circuit

1995-06-26

1996-08-06

Westin, Edward.

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326 68, H03K 190175, H03K 19094

Patent

active

055437338

ABSTRACT:
An input/output circuit communicates an external input signal to an internal signal and converts an internal signal to an external output signal. In one embodiment, the input/output circuit has a power supply terminal, and an input terminal that is coupled to an output terminal via a conductor. A pull-up circuit is coupled to the power supply terminal and the conductor, and includes a PMOS transistor having an N-well, where the pull-up circuit is configured to selectively pull-up the output signal. A pull-down circuit is coupled to a ground terminal and the conductor, and is configured to selectively pull-down the output signal. A comparison and logic control circuit is coupled to the power supply terminal and to the conductor, and is configured to compare a supply voltage level to the input signal and is configured to generate an affirmative logic signal when the input signal is greater than the supply voltage level and to generate a negative logic signal when the input signal is less than the supply voltage level. An N-well control circuit is coupled to the power supply terminal, to the conductor and to the pull-up circuit, where the N-well control circuit is responsive to the logic signal, and is configured to output a control N-well signal to control the PMOS transistor N-well voltage.

REFERENCES:
patent: 5017811 (1991-05-01), Worley
patent: 5442307 (1995-08-01), Shigehara et al.
patent: 5448198 (1995-09-01), Toyoshima et al.
patent: 5450025 (1995-09-01), Shay
patent: 5451889 (1995-09-01), Hiem et al.

Affiliated with

Also associated with

Rating

High voltage tolerant CMOS input/output circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High voltage tolerant CMOS input/output circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High voltage tolerant CMOS input/output circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2193532