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:
Oct. 12, 2010
Filed:
Jul. 23, 2008
Norihisa Arai, Saitama, JP;
Norihisa Arai, Saitama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor memory device includes a memory cell array which includes at least one memory unit having a preset number of memory cell transistors and a selection gate transistor on a source side, a preset number of word lines respectively connected to control gates of the preset number of memory cell transistors, and a selection gate line on a source side connected to a gate electrode of the selection gate transistor on the source side. In the semiconductor memory device, a distance C between the selection gate line at least on the source side and one of the word lines adjacent thereto is set to n*A+(n−1)B, where n is an integer greater than or equal to 2, A indicates the pitch between adjacent ones of the preset number of word lines, and B indicates the width of each of the preset number of word lines.