NONVOLATILE SEMICONDUCTOR MEMORY

摘要

PROBLEM TO BE SOLVED: To narrow distribution width of a threshold value after write while suppressing increment of a write time.

SOLUTION: A nonvolatile semiconductor memory is provided with a nonvolatile semiconductor memory cell in which data can be rewritten electrically, and a write circuit being a write circuit writing data in a memory cell performing write for the memory cell by supplying write voltage Vpgm and write control voltage VBL to the memory cell and varying a value of the write control voltage VBL when the memory cell reaches a first write state and performing write for the memory cell, varying a value of the write control voltage VBL to Vdd when the memory cell reaches a second write state and prohibiting write of the memory cell M.

COPYRIGHT: (C)2003,JPO