Static information storage and retrieval – Floating gate – Particular biasing
Patent
1998-04-02
1999-05-04
Le, Vu A.
Static information storage and retrieval
Floating gate
Particular biasing
36518503, 36518519, G11C 700
Patent
active
059010894
ABSTRACT:
An integrated circuit memory system having memory cells capable of storing multiple bits per memory cell is described. The memory system has a restoring operation in which a memory cells' stored charge, which may drift from its initially set condition, is maintained within one of a plurality of predetermined levels corresponding to digital bits of information and defined by a set of special reference voltage values. The memory system has mini-programming and mini-erasing operations to move only the amount of charge into and out of the memory cell sufficient to keep the charge within the predetermined levels. The memory system also has an operation for high speed programming of the memory cells and an erasing operation to narrow the charge distribution of erased memory cells for increasing the spread, and safety margins, between the predetermined levels.
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Khan Sakhawat M.
Korsh George J.
Agate Semiconductor, Inc.
Le Vu A.
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