Nonvolatile semiconductor memory device

Details Nonvolatile semiconductor memory device Nonvolatile semiconductor memory device

2006-12-12

2008-11-11

Pham, Ly D (Department: 2827)

Static information storage and retrieval

Floating gate

Multiple values

C365S185180, C365S185230, C365S185240

Reexamination Certificate

active

07450417

ABSTRACT:
There is provided a nonvolatile semiconductor memory device capable of accelerating writing time and avoiding readout errors of information by eliminating variation in threshold voltage of unselected memory cells. In a nonvolatile semiconductor memory device having a memory cell array with memory cells capable of erasing and programming information, the memory cells store one data value selected from the same number of data values as programming distribution ranges, associated with that the electrical attribute belongs to any one of the more than one programming distribution ranges. The device comprises an erasure means for erasing the selected memory cell to be erased so that its electrical attribute belongs to a erasure distribution range not overlapping any of the programming distribution ranges and a programming means for programming an erased memory cell to be programmed so that its electrical attribute belongs to any one of the programming distribution ranges.

REFERENCES:
patent: 5675537 (1997-10-01), Bill et al.
patent: 5818753 (1998-10-01), Gotou
patent: 6154391 (2000-11-01), Takeuchi et al.
patent: 6195285 (2001-02-01), Yamamoto et al.
patent: 6421277 (2002-07-01), Tsunesada
patent: 6970380 (2005-11-01), Yeh et al.
patent: 7295468 (2007-11-01), Shibata
patent: 2007/0064480 (2007-03-01), Kuo et al.
patent: 8-106793 (1996-04-01), None

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