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Volatile/non-volatile dynamic RAM system

  • US 4,375,086 A
  • Filed: 05/15/1980
  • Issued: 02/22/1983
  • Est. Priority Date: 05/15/1980
  • Status: Expired due to Term
First Claim
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1. A volatile/non-volatile RAM cell having volatile data store, volatile-to-nonvolatile store, and nonvolatile-to-volatile restore capabilities, comprising:

  • volatile storage means, including a capacitor, for storing binary charge data;

    non-volatile storage means for selectively storing the charge data in the volatile storage means;

    means for providing a preselected energy barrier which must be overcome for charge transfer between the volatile storage means and the non-volatile storage means; and

    a charge transfer device for effecting the charge storage state of the volatile storage means during volatile operation and in cooperation with the nonvolatile storage means effecting the nonvolatile-to-volatile restore operation.

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