The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 2012
Filed:
Mar. 10, 2010
Hiromitsu Komai, Kamakura, JP;
Hiromitsu Komai, Kamakura, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A nonvolatile semiconductor memory device comprises: a memory cell array having a plurality of memory cells arranged therein, each of the memory cells capable of storing multiple bits of information including multiple pages of information and is allocated to a plurality of threshold voltage distributions; and a control circuit configured to write information to a memory cell by applying a voltage to a bit line and a word line to change a threshold voltage of the memory cell. During writing of information to a plurality of the memory cells connected to an identical word line, the control circuit is configured to apply, to each of the bit lines corresponding to the plurality of the memory cells, any one of voltages that differ from one another according to the multiple bits of information to be written.