Nonvolatile semiconductor memory device and data program method thereof
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United States of America Patent
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Oct 19, 2004
Grant Date -
Jul 22, 2004
app pub date -
Nov 5, 2003
filing date -
Nov 29, 2002
priority date (Note) -
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Abstract
A nonvolatile semiconductor memory device includes cell transistors connected to a plurality of wirings, word lines each commonly connected to the gate electrodes of those of the cell transistors which are arranged on a corresponding row, and driving circuits respectively connected to the plurality of wirings. The driving circuit includes a detection circuit which detects threshold voltage of the cell transistor in a verify operation, a storage circuit which stores threshold voltage detected and a potential setting circuit which sets potential of the wiring to at least three potentials based on the threshold voltage stored in the storage circuit in a program operation following the verify operation.
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