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Power supply control for integrated circuit

  • US 4,451,742 A
  • Filed: 12/09/1983
  • Issued: 05/29/1984
  • Est. Priority Date: 05/27/1981
  • Status: Expired due to Term
First Claim
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1. A method for providing power to an integrated circuit from one of a plurality of sources, comprising the steps of:

  • providing a primary power source and first and second backup power sources;

    comparing the voltages of said first and said second backup power sources to select the backup power source having the higher voltage;

    connecting the one of said backup power sources having the higher voltage to supply power to said integrated circuit when the voltage of said primary power source is less than a first predetermined voltage; and

    disabling input signals to said integrated circuit when the voltage of the power source connected thereto is less than a second predetermined voltage.

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