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. 29, 1991
Filed:
Feb. 22, 1989
Applicant:
Inventors:
Masaki Kumanoya, Hyogo, JP;
Katsumi Dosaka, Hyogo, JP;
Yasuhiro Konishi, Hyogo, JP;
Takahiro Komatsu, Hyogo, JP;
Youichi Tobita, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365222 ; 36518904 ; 36518901 ;
Abstract
In a dynamic random access memory (DRAM), there is provided a refresh decision circuit which detects the external designation of a self refresh mode, in addition to a CAS before RAS refresh mode, by RAS and CAS signals. By detecting a time period of one cycle of the RAS, the self refresh mode is determined. As a result, the timing of change of the RAS signal is less restricted.