Static information storage and retrieval – Systems using particular element – Capacitors
Patent
1980-05-15
1983-02-22
Moffitt, James W.
Static information storage and retrieval
Systems using particular element
Capacitors
365228, G11C 1124
Patent
active
043750869
ABSTRACT:
A volatile
on-volatile dynamic RAM cell and system in which the cell comprises a storage capacitor for volatilely storing binary information during normal RAM operation; an alterable-threshold storage capacitor for non-volatilely storing the information in non-volatile fashion during power off conditions; and an energy barrier between the two capacitors. Information can be restored to the volatile capacitor either by CCD charge transfer or by charge-pumped operation. The energy barrier facilitates efficient charge pumped restore of information. In one embodiment, the energy barrier is a high concentration substrate surface region having the same conductivity type as the substrate. Alternatively, the alterable-threshold non-volatile capacitor and the energy barrier are provided by a split-gate capacitor which has an alterable threshold non-volatile section (the non-volatile capacitor) and a non-alterable threshold section (the energy barrier).
REFERENCES:
patent: 3761901 (1973-09-01), Aneshansley
patent: 3771148 (1973-11-01), Aneshansley
patent: 3774177 (1973-11-01), Schaffer
patent: 3911464 (1975-10-01), Chang et al.
patent: 4091460 (1978-05-01), Schuermeyer et al.
patent: 4175291 (1979-11-01), Spence
Cavender J. T.
Dalton Philip A.
Moffitt James W.
NCR Corporation
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