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Method and apparatus for controlling a mixed voltage interface in a multivoltage system

  • US 5,440,244 A
  • Filed: 11/08/1993
  • Issued: 08/08/1995
  • Est. Priority Date: 02/10/1993
  • Status: Expired due to Term
First Claim
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1. A receiver for receiving signals along an input line, said receiver being within an integrated circuit having core circuitry operating at a core voltage power level, said receiver comprising:

  • a first NOR gate having a first input connected to said input line and a second input connected to a first gate enable line, said first NOR gate having a triggering level set to a first triggering level;

    a second NOR gate having a first input connected to said input line and a second input connected to a second gate enable line, said second NOR gate having a triggering level set to a second triggering level;

    a third NOR gate having first and second inputs connected to outputs of said first and second NOR gates respectively, and an output connected to an output line connected to the core circuitry of the integrated circuit;

    said first, second and third NOR gates being powered at said core voltage power level; and

    means for transmitting a NOR gate enable signal to one of said first and second NOR gates along a respective gate enable line for enabling one of said first and second NOR gates.

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