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Level shift circuit

  • US 7,759,976 B2
  • Filed: 08/24/2007
  • Issued: 07/20/2010
  • Est. Priority Date: 08/24/2006
  • Status: Expired due to Fees
First Claim
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1. A level shift circuit comprising:

  • a first logic unit, based on an input signal and a first operation control signal indicating a supply state of a first voltage, generating a first control signal in accordance with the input signal when the level shift circuit is supplied with the first voltage and a second voltage, and including a first transistor which clamps the first control signal at a predetermined first level based on the first operation control signal when the level shift circuit is supplied with the second voltage;

    a second logic unit, based on the first control signal and a second operation control signal indicating the supply state of the first voltage, generating a second control signal in accordance with the first control signal when the level shift circuit is supplied with the first and second voltages, and including a second transistor which clamps the second control signal at a predetermined second level based on the second operation control signal when the level shift circuit is supplied with the second voltage; and

    a level converter, generating an output signal in response to the first and second control signals.

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