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:
Sep. 20, 2011
Filed:
Feb. 18, 2011
Masaki Fujiu, Yokohama, JP;
Masaki Fujiu, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor memory device includes memory cells, word lines, a driver circuit, and a control circuit. The driver circuit repeats a programming operation of selecting any one of the word lines, of applying a first voltage to selected one of the word lines, and of applying a second voltage to unselected one of the word lines, to write data to selected one of the memory cells connected to the selected one of the word lines. The control circuit, while the driver circuit is repeating the programming operation, steps up the first voltage and keeps the second voltage constant until the first voltage reaches a first threshold. The control circuit steps up the second voltage after the first voltage has reached the first threshold.