Non-volatile semiconductor memory adapted to store a multi-valued data in a single memory cell
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United States of America Patent
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Oct 23, 2007
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app pub date -
May 4, 2006
filing date -
Dec 27, 2001
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Abstract
A non-volatile semiconductor memory device includes an electrically data rewritable non-volatile semiconductor memory cell and a write circuit for writing data in the memory cell, the write circuit writing a data in the memory cells by supplying a write voltage Vpgm and a write control voltage VBL to the memory cell, continuing the writing of the data in the memory cell by changing the value of the write control voltage VBL in response to an advent of a first write state of the memory cell and inhibiting any operation of writing a data to the memory cell by further changing the value of the write control voltage VBL to Vdd in response to an advent of a second write state of the memory cell.
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