Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 27, 2007
Patent Application Number
11297467
Date Filed
December 9, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
A memory cell stores several data using n (n: natural number more than 1) threshold voltages. A voltage supply circuit supplies a predetermined voltage to a gate of the memory cell in a verify operation of verifying whether or not the memory cell reaches a predetermined threshold voltage. A detection circuit connected to one terminal of the memory cell charges one terminal of the memory cell to a predetermined potential. The detection circuit detects the voltage of one terminal of the memory cell based on a first detection timing, and further, detects the voltage of one terminal of the memory cell based on a second detection timing.
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