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:
Apr. 06, 2010
Filed:
Nov. 21, 2007
Applicants:
Yukio Fuji, Tokyo, JP;
Yasuko Tonomura, Tokyo, JP;
Inventors:
Yukio Fuji, Tokyo, JP;
Yasuko Tonomura, Tokyo, JP;
Assignee:
Elpida Memory, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a memory readout circuit for use in a phase-change memory device comprising phase-change elements as memory cells, a sense amplifier sets readout voltage, which is applied to a selected phase-change element selected among the phase-change elements by a column selecting switch, to voltage equal to or higher than hold voltage of the selected phase-change element but lower than transition voltage of the selected phase-change element in a readout cycle. The selected phase-change element is read out as a dynamic state in the case where the selected phase-change element is in a set state.