Nonvolatile semiconductor memory device

A nonvolatile semiconductor memory device according to an embodiment includes: a memory cell array configured having NAND strings arranged therein; a plurality of word lines; a plurality of bit lines; a source line; and a control circuit configured to apply a verify voltage to a selected word line,...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Hirai Ryota, Shiino Yasuhiro
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A nonvolatile semiconductor memory device according to an embodiment includes: a memory cell array configured having NAND strings arranged therein; a plurality of word lines; a plurality of bit lines; a source line; and a control circuit configured to apply a verify voltage to a selected word line, apply a read pass voltage that renders conductive an unselected memory cell regardless of cell data to an unselected word line, and apply a bit line voltage of a certain value to a selected bit line, thereby executing a write verify operation that determines whether a selected memory cell has a desired threshold voltage or not. The control circuit is configured capable of changing a voltage value of the bit line voltage based on a position of the selected word line among the plurality of word lines relative to the NAND string.