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. 06, 1998
Filed:
Feb. 25, 1997
Applicant:
Inventors:
Toshio Sasaki, Mizuho-machi, JP;
Kazumasa Yanagisawa, Kokubunji, JP;
Toshio Sugano, Kodaira, JP;
Kiyoshi Inoue, Tokyo, JP;
Seiichiro Tsukui, Sayama, JP;
Masakazu Aoki, Tokorozawa, JP;
Shigeru Suzuki, Kokubunji, JP;
Masashi Horiguchi, Kawasaki, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Tohbu Semiconductor, Ltd., Sairama, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01C / ;
U.S. Cl.
CPC ...
36523008 ; 365200 ;
Abstract
Input/output terminals of a first semiconductor memory device in which failures or defects exist in units of memory mats and input/output terminals of a second semiconductor memory device having redundant memory mats are connected to one another on a mounted substrate to thereby relieve the failures in the memory mat units. A power source is substantially cut off from supplying to a faulty memory mat.