Electronic digital logic circuitry – Interface – Supply voltage level shifting
Patent
1997-05-22
2000-03-07
Tokar, Michael
Electronic digital logic circuitry
Interface
Supply voltage level shifting
326 83, 326 49, H03K 19185
Patent
active
060345500
ABSTRACT:
A multiple-power IC device comprising an input buffer circuit for receiving an input signal and a plurality of power voltages of different magnitudes. The input buffer circuit has an output associated with each of the plurality of power voltages for outputting the input signal in accordance with a predetermined threshold voltage. The device further comprises an internal circuit, a switching circuit interposed between the input buffer circuit and the internal circuit, and a power voltage determination circuit coupled to the switching circuit and receiving the plurality of power voltages. The power voltage determination circuit controls the switching circuit to selectively couple an output of the input buffer circuit to the internal circuit in accordance with the magnitude of the received power voltage. Thus, the input signal is coupled to the internal circuit according to the predetermined threshold voltage regardless of the power voltage applied to the input buffer circuit.
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Frank Robert J.
Le Don Phu
OKI Electric Industry Co., Ltd.
Tokar Michael
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