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:
Apr. 17, 2012
Filed:
Sep. 17, 2010
Yasuhiko Honda, Hiratsuka, JP;
Yasuhiko Honda, Hiratsuka, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a nonvolatile semiconductor memory device includes a memory cell transistor, a word line, a row decoder, a sense amplifier which determines the data in the memory cell transistor via the bit line, a first bit line clamp transistor connected in series between the bit line and the sense amplifier, a second bit line clamp transistor connected in parallel to the first bit line clamp transistor and having a current driving capability higher than that of the first bit line clamp transistor, and a bit line control circuit which turns on the first bit line clamp transistor and the second bit line clamp transistor using a common gate voltage during a predetermined period from a start of charge of the bit line, and turns off only the second bit line clamp transistor when the predetermined period has elapsed.