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:
Jun. 03, 2008
Filed:
Dec. 04, 2006
Fumitaka Arai, Yokohama, JP;
Masayuki Ichige, Yokkaichi, JP;
Fumitaka Arai, Yokohama, JP;
Masayuki Ichige, Yokkaichi, JP;
Kabsuhiki Kaisha Toshiba, Tokyo, JP;
Abstract
A first selection transistor is connected between one end of a memory cell group and a bit line. A second selection transistor which has a gate length shorter than a gate length of the first transistor is connected between the other end of the memory cell group and a source line. In a write, a control gate driver applies a write voltage to the control gate of the memory cell as a write target, and applies an intermediate voltage to the control gates of the other memory cells. A selection gate driver supplies a first voltage lower than the intermediate voltage to the first transistor, and supplies a second voltage lower than the first voltage to the second transistor. A bit line controller supplies the first voltage to the bit line which is not selected for writing, and a source line driver supplies the first voltage to the source line.