Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Koji Kato0
Date of Patent
February 6, 2024
0Patent Application Number
174698120
Date Filed
September 8, 2021
0Patent Citations
Patent Primary Examiner
Patent abstract
A semiconductor memory device according to an embodiment includes memory cell transistors, a word line, and a controller. A memory cell transistor whose threshold voltage is included in first and second states store first and second data, respectively. In a verify operation of the first data, during application of a verify high voltage of the first data to the word line, the controller is configured to determine whether or not a threshold voltage of a memory cell transistor to which the first data is to be written exceeds the verify high voltage of the first data, and also determine whether or not a threshold voltage of a memory cell transistor to which the second data is to be written exceeds a verify low voltage of the second data.
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