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:
Jan. 26, 2010
Filed:
Aug. 17, 2005
Hiroyuki Takahashi, Kanagawa, JP;
Atsushi Nakagawa, Kanagawa, JP;
Takuya Kera, Kanagawa, JP;
Masaki Miyata, Kanagawa, JP;
Yasunari Kawaguchi, Kanagawa, JP;
Kouichi Gotou, Kanagawa, JP;
Hiroyuki Takahashi, Kanagawa, JP;
Atsushi Nakagawa, Kanagawa, JP;
Takuya Kera, Kanagawa, JP;
Masaki Miyata, Kanagawa, JP;
Yasunari Kawaguchi, Kanagawa, JP;
Kouichi Gotou, Kanagawa, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
Disclosed is a semiconductor memory device having memory cells that are in need of refresh for data retention, includes control circuits for necessarily generating the refresh immediately before the read/write operation, and for setting the latency to a first fixed value at all times, for the first mode during the testing, and for necessarily generating the refresh immediately after the read/write operation, and for setting the latency to a second fixed value at all times, for the second mode during the testing.