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:
Nov. 08, 2011
Filed:
Jun. 16, 2008
Kiyoshi Nakai, Tokyo, JP;
Shuichi Tsukada, Tokyo, JP;
Yusuke Jono, Tokyo, JP;
Elpida Memory Inc., Tokyo, JP;
Abstract
A phase change memory device comprises: a phase change element for rewritably storing data by changing a resistance state; a memory cell arranged at an intersection of a word line and a bit line and formed of the phase change element and a diode connected in series; a select transistor formed in a diffusion layer below the memory cell, for selectively controlling electric connection between an anode of the diode and a ground line in response to a potential of the word line connected to a gate; and a precharge circuit for precharging the diffusion layer below the memory cell corresponding to a non-selected word line to a predetermined voltage and for disconnecting the diffusion layer below the memory cell corresponding to a selected word line from the predetermined voltage.