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:
Oct. 16, 2007
Filed:
Jan. 28, 2005
Koji Inoue, Ikoma, JP;
Yoshinao Morikawa, Ikoma, JP;
Atsushi Shimaoka, Kashihara, JP;
Yukio Tamai, Fukuyama, JP;
Koji Inoue, Ikoma, JP;
Yoshinao Morikawa, Ikoma, JP;
Atsushi Shimaoka, Kashihara, JP;
Yukio Tamai, Fukuyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A semiconductor memory device comprises a column readout voltage supply circuit which supplies a predetermined first voltage when readout is selected and supplies a predetermined second voltage which is different from the fist voltage when the readout is not selected, to each column selection line, a row readout voltage supply circuit which supplies the second voltage to each row selection line at the time of readout, a sense circuit which detects a current flowing in the selected row selection line separately from a current flowing in the non-selected row selection lines to detect an electric resistance state of the selected memory cell at the time of readout, and a column voltage displacement prevention circuit which prevents displacement of a supplied voltage level for each of the non-selected column selection lines at the time of readout.