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:
Dec. 01, 1992
Filed:
Nov. 07, 1991
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A semiconductor memory device comprises a memory cell array, a redundant memory cell array, bit line pairs, spare bit line pairs, a column address information storage circuit having stored therein information of a column address of a faulty cell and a column address of a spare cell, column decoders, a first column selecting gate for connecting one of the bit line pairs and first data output line pairs, a second column selecting gate for connecting one of the bit line pairs and a second data output line pair, a spare column decoder for selecting a third or a fourth column selecting line, a third column selecting gate for connecting the spare bit line pairs and the first data output line pairs, a fourth column selecting gate for connecting the spare bit line pairs and the second data output line pair, a first buffer for selecting two data and amplifying and outputting, a second buffer for amplifying and outputting data from the second data output line pair, and a register for storing therein data from the first and/or second buffers.