Multiplexing of digital signals at multiple supply voltages...

Details Multiplexing of digital signals at multiple supply voltages... Multiplexing of digital signals at multiple supply voltages...

2005-02-15

2005-02-15

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Decoding

C326S105000, C326S081000, C326S068000, C326S113000, C327S333000

Reexamination Certificate

active

06856173

ABSTRACT:
An integrated circuit (10) includes a multiple voltage digital multiplexer circuit (30) for multiplexing digital signals provided at different supply voltage levels. In one form, the multiplexer (30) includes an analog multiplexer (32) for receiving the digital signals, a level shifter (40) coupled to the output of the analog multiplexer (32), and a supply voltage multiplexer (34) for providing one of various supply voltages used on the IC corresponding to the signals being multiplexed. A control circuit (38, 39) is used to control the input selection of the analog multiplexer (32) as well as the supply voltage multiplexer (34) for providing the correct supply voltage to the level shifter (40). This provides the ability to multiplex digital signals of differing voltage levels onto a single pad on the IC (10).

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patent: 6020760 (2000-02-01), Sample
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patent: 6710621 (2004-03-01), Devlin et al.
patent: 20020153923 (2002-10-01), Piasecki

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