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Power failure memory support system

  • US 4,323,987 A
  • Filed: 03/28/1980
  • Issued: 04/06/1982
  • Est. Priority Date: 03/28/1980
  • Status: Expired due to Term
First Claim
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1. A data processing system comprising:

  • (a) volatile memory for storing data, said volatile memory having a given time within which data therein must be refreshed;

    (b) first power supply for maintaining said data in said volatile memory;

    (c) power sensing means for detecting a power failure of said first power supply;

    (d) a second power supply for independently supplying power when said power sensing means detects a power failure of said first power supply;

    (e) timing means operatively connected to said power sensing means for detecting a lapse of time from said power failure; and

    (f) delay ouput means coupled to said volatile memory and connected to be operated by said second power supply for transferring said data from said volatile memory to an external device when said timing means indicates that a predetermined time interval has elapsed, said predetermined time interval being substantially greater than said time within which data in said volatile memory must be refreshed.

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