Over-voltage tolerant multifunction input stage

Details Over-voltage tolerant multifunction input stage Over-voltage tolerant multifunction input stage

2008-01-22

2008-01-22

Chang, Daniel D. (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S023000

Reexamination Certificate

active

07321238

ABSTRACT:
An over-voltage tolerant input stage in a semiconductor device is disclosed. The input stage includes: an input pad for receiving an input signal to the semiconductor device, a buffer coupled to the input pad for buffering the input signal, a pullup circuit for limiting current in the input signal, a switching circuit coupled to the input pad for controlling the pullup circuit, and a voltage supply coupled to the input pad, the pullup circuit and the switching circuit. In operation, the switching circuit is enabled to cause the pullup circuit to stop current flow between the input signal and voltage supply in the event of an over-voltage condition.

REFERENCES:
patent: 5914844 (1999-06-01), Lutley et al.
patent: 6049242 (2000-04-01), Lutley et al.
patent: 6150845 (2000-11-01), Morrill
patent: 7199614 (2007-04-01), Dover et al.

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