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:
Mar. 26, 2013
Filed:
Feb. 03, 2011
Applicant:
Hidefumi Nawata, Kawasaki, JP;
Inventor:
Hidefumi Nawata, Kawasaki, JP;
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C 11/34 (2006.01); G11C 16/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A control circuit is configured to execute a writing operation for giving a second threshold voltage distribution to a plurality of memory cells formed along one word line. In the writing operation, the control circuit performs a writing operation by executing a voltage applying operation in memory cells to be given the second threshold voltage distribution. While the control circuit executes a voltage applying operation in memory cells to be maintained in an erased state, thereby moving a first threshold voltage distribution to a positive direction to obtain a third threshold voltage distribution representing the erased state.