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. 09, 2014
Filed:
Apr. 25, 2013
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Hitoshi Iwai, Kamakura, JP;
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Abstract
A control circuit is configured to, during an erase operation, set a voltage of a first line connected to a selected cell unit to a voltage larger than a voltage of a gate of a first transistor included in the selected cell unit by an amount of a first voltage; set a voltage difference between a voltage of a first line connected to an unselected cell unit and a voltage of a gate of a first transistor included in the unselected cell unit to a second voltage, the first and second voltages being different; apply in the selected and unselected cell units a third voltage to a gate of at least one of dummy transistors in a dummy memory string; and apply a fourth voltage to a gate of another one of the dummy transistors in the dummy memory string, the fourth voltage being lower than the third voltage.