Voltage tolerant circuit for protecting an input buffer

Details Voltage tolerant circuit for protecting an input buffer Voltage tolerant circuit for protecting an input buffer

2005-08-02

2005-08-02

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C361S091100, C361S091700, C361S093900

Reexamination Certificate

active

06924687

ABSTRACT:
An invention is disclosed for protecting an input buffer. A current from a p-supply to an input buffer is lowered when an input voltage to the input buffer is tolerant HIGH. The p-supply being a VDDvoltage supplied to a p-channel transistor in the input buffer. In addition, the p-supply is set to a particular voltage when the input voltage to the input buffer is LOW, the particular voltage being at a specific value such that input transistors within the input buffer do not experience overstress voltages. Optionally, p-supply can be prevented from supplying current to the input buffer when an input voltage to the input buffer is tolerant HIGH.

REFERENCES:
patent: 5973530 (1999-10-01), Morris et al.
patent: 6150843 (2000-11-01), Shiffer et al.
patent: 6271703 (2001-08-01), Wert
patent: 6342996 (2002-01-01), Drapkin et al.
patent: 6441670 (2002-08-01), Coughlin et al.

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