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:
Feb. 08, 2011
Filed:
May. 05, 2009
Osamu Hirabayashi, Suginami-ku, JP;
Osamu Hirabayashi, Suginami-ku, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor memory device comprises a logic circuit supplied with a first supply voltage; a cell array supplied with a second supply voltage higher than the first supply voltage and including plural mutually intersecting word lines and bit lines and plural memory cells connected at intersections thereof; and a word line driver operative to drive the word lines. The word line driver includes plural pull-up circuits connected between the supply terminal of the first supply voltage and the drive terminal of the word line and between the supply terminal of the second supply voltage and the drive terminal of the word line, and a pull-down circuit connected between the drive terminal of the word line and the ground terminal, and drives the word line with an intermediate voltage between the first and second supply voltages in accordance with a driving force ratio between the plural pull-up circuits at the time of driving the word line.