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:
Jul. 03, 2007
Filed:
Jun. 15, 2005
Koji Inoue, Ikoma, JP;
Koji Inoue, Ikoma, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A semiconductor memory device having a crosspoint-type memory cell array includes a column readout voltage supply circuitwhich supplies a predetermined first voltage when readout is selected, and supplies a second voltage different from the first voltage when the readout is not selected, to each of column selection lines BL, a row readout voltage supply circuitwhich supplies the second voltage to each of row selection lines DL at the time of readout, a sense circuitwhich senses a current flowing in the selected row selection line DL separately from a current flowing in the unselected row selection lines DL and senses an electric resistance state of the selected memory cell at the time of readout, and a row voltage displacement prevention circuitwhich prevents a displacement in a supplied voltage level in at least selected row selection line DL at the time of readout.