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. 13, 1993
Filed:
May. 31, 1991
Shigeru Kikuda, Hyogo, JP;
Takeshi Hamamoto, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The semiconductor circuit device includes a first column decoder for decoding an internal column address and generating a column select signal which selects one column, and a second column decoder for simultaneously selecting a plurality of successively adjacent columns from a memory cell array in accordance with the column select signal. The second column decoder selects the same column in a duplicated way in response to different column select signals. Since the same column is selected in a duplicate way by the different column select signals, it will be possible to simultaneously select a desired combination of a plurality of columns. A combination of a plurality of columns simultaneously selected can be arbitrarily set and a desired combination of columns can be selected with a simplified circuit structure at high speed. It will be possible to repair a column containing a defective bit without providing a redundant column by providing an input/output control circuit for further selecting a column from the columns simultaneously selected in accordance with the column select signal.