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. 23, 1991
Filed:
Jul. 21, 1989
Mitsuo Isobe, Tama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A semiconductor memory device has a memory cell matrix in which a plurality of memory cells are connected in rows by work lines and in columns by bit lines. The device comprises cell row groups each of which is formed by memory cell rows commonly activated by several row address signals at a first selection stage, a row group selection decoder having the smallest decoding circuits as a first stage decoder each connected to the row group(s) by first stage word line and commonly activating any group(s) at the first row selection stage by several row address signals, and a row selection decoder as a second stage decoder having the smallest decoding units entirely provided in the matrix and each activating any cell row(s) at a second selection stage by remaining row address signals.