Patents Represented by Attorney, Agent or Law Firm Vollrath & Assoc.
  • Elimination of current drain in step-up level shifter when low power domain is off
    Patent number: 6600358
    Abstract: In a level shifter for shifting from one voltage to another one, a circuit to eliminate current drain when the low voltage supply is off, includes circuitry for eliminating floating nodes and for providing a distinct output voltage. The circuit includes circuitry for monitoring the low voltage supply and switch in the level shifter when the supply is on. When the supply is off, the input is isolated from the output and an output signal derived from the high voltage supply is provided to the output.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: July 29, 2003
    Assignee: National Semiconductor Corporation
    Inventor: Wai Cheong Chan