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. 21, 2012
Filed:
Sep. 17, 2010
Mikio Ogawa, Yokohama, JP;
Mikio Ogawa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a semiconductor memory device includes a semiconductor substrate which includes a well. A memory cell array includes memory cells each including a floating gate electrode above the well and a control gate electrode above the floating gate electrode, and is configured to write data in units of pages each including memory cells connected in series and to erase data in units of blocks each includes a plurality of the pages. A control gate line is selectively electrically connected to the control gate electrodes of at least one of the blocks. A first switching element includes a current path having ends connected to the control gate line and a ground end. The well is charged, and the first switching element is turned off before the end of the discharge of the well.