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, 2002
Filed:
Feb. 01, 2001
Masahiro Hosoda, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor memory device includes an inner circuit. The inner circuit includes a command user interface, a logical circuit and a pad. Based upon an externally input fixing command, the command user interface outputs signals A and B with H or L level. Upon receipt of the signal A of H level and the signal B of L level, the logical circuit outputs a fixed logical signal of H level independent of the signal received from the pad, and upon receipt of the signal A of L level and the signal B of H level, outputs a fixed logical signal of L level independent of the signal received from the pad. Thus, it becomes possible to carry out a high-quality testing operation even when the number of the test pins of a test device is smaller than the number of address pins or data pins of a semiconductor memory device.