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Circuit for preserving data in a flip-flop and a method of use

  • US 6,762,638 B2
  • Filed: 10/16/2002
  • Issued: 07/13/2004
  • Est. Priority Date: 10/16/2002
  • Status: Active Grant
First Claim
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1. A flip-flop comprising:

  • a first latch coupled to a first power supply; and

    a second latch coupled to the first latch and coupled to a second power supply, wherein the first and second power supplies are independently controllable to minimize power consumption when the flip-flop is in a power saving mode; and

    a state saving latch which is coupled to the second power supply and is only activated upon detection of standby power saving mode wherein the contents of the first latch are loaded into the state saving latch, wherein the first power supply is reduced to 0 volts and the second power supply is reduced to minimum voltage to sustain the state.

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