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Integrated circuit using a power supply input for digital logic

  • US 6,115,595 A
  • Filed: 05/04/1998
  • Issued: 09/05/2000
  • Est. Priority Date: 05/04/1998
  • Status: Expired due to Term
First Claim
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1. A method for selecting an operational mode of an electronic device, comprising steps of:

  • receiving a first voltage input having a first first voltage state or a second first voltage state, a second voltage input having a first second voltage state or a second second voltage state, and a third voltage input having a first third voltage state or a second third voltage state;

    operating a first circuit with power drawn from said first voltage input only when said first voltage input has said first first voltage state;

    operating a second circuit with power drawn from said second voltage input only when said second voltage input has said first second voltage state and said first voltage input has said first first voltage state; and

    operating a third circuit with power drawn from said second voltage input only when said second voltage input has said first second voltage state and either of said first voltage input has said first first voltage state and said third voltage input has said first third voltage state.

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