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:
Jul. 28, 1998
Filed:
Feb. 27, 1995
Takashi Akioka, Hitachi, JP;
Yuji Yokoyama, Hitachi, JP;
Atsushi Hiraishi, Oume, JP;
Masahiro Iwamura, Hitachi, JP;
Yutaka Kobayashi, Katsuta, JP;
Tatsumi Yamauchi, Hitachi, JP;
Shigeru Takahashi, Hitachiohta, JP;
Koichi Motohashi, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A semiconductor device is provided which comprises a memory mat formed by dividing a memory into a plurality of blocks and a circuit arrangement disposed at every memory mat block for generating access suppression signals at least for defective memory cells within that block. Using this arrangement, the access speed to a redundant memory cell array for relieving the defects is increased so that a semiconductor memory device capable of a high speed operation is obtained.