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. 23, 2009
Filed:
Aug. 29, 2007
Susumu Shuto, Yokohama, JP;
Susumu Shuto, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A memory cell includes a ferroelectric capacitor for holding a charge and a transistor connected in parallel with the ferroelectric capacitor. A plurality of the ferroelectric memory cells are connected in series to form a memory cell block. A selection transistor connects, to one end of the block. A bit line connects to the selection transistor. A plate line connects to the other end of the block. A control circuit changes potentials of the word line and the bit line. With the potential of the plate line being held constant, the potential of the word line is changed, thereby erasing information or writing information to the ferroelectric memory cells.