Semiconductor memory device having non-volatile memory cells connected in series
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United States of America Patent
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Apr 27, 1999
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N/A
app pub date -
Aug 1, 1997
filing date -
Mar 19, 1997
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Abstract
A non-volatile semiconductor memory device includes a string of memory cells provided for units of a predetermined information storage region and having a plurality of rewritable non-volatile memory cells connected in series. The string of memory cells is divided into a plurality of groups of memory cells. The device further includes a plurality of switching elements each connected in parallel with a corresponding one of the divided groups of memory cells, and a control unit for controlling on/off operations of the plurality of switching elements. Owing to this configuration, even if an invalid block occurs, the memory cells can be utilized effectively as a whole without the need of making the whole block unavailable.
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