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:
Feb. 19, 2013
Filed:
Mar. 09, 2012
Hiroshi Maejima, Chigasaki, JP;
Katsuaki Isobe, Yokohama, JP;
Hideo Mukai, Ota-ku, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A nonvolatile semiconductor storage device includes first and second intersecting wires; a electrically rewritable memory cell disposed at each intersection of the first second wires, including a variable resistor for memorizing a resistance value as data in a nonvolatile manner and a rectifying device are connected in series; and a control circuit which applies a voltage necessary for writing of data to the first and second wires. The control circuit precharges a non-selected second wire to a standby voltage larger than a reference voltage prior to programming a variable resistor connected to selected first and second wires by supplying the reference voltage to a non-selected first wire and the selected second wire, applying to the selected first wire a program voltage for programming of the selected variable resistor and applying to the non-selected second wire a control voltage which prevents the rectifying device from turning ON.