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:
Feb. 13, 2001
Filed:
Jul. 08, 1998
Applicant:
Inventors:
Maki Kitaoka, Hyogo, JP;
Tsuyoshi Hamamoto, Hyogo, JP;
Hideki Yamauchi, Hyogo, JP;
Takashi Izutsu, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 2/900 ;
U.S. Cl.
CPC ...
G11C 2/900 ;
Abstract
A counter is provided in an SRAM using a CSP (Chip Scale Package). The counter includes n+1 stages of flipflops, counts the number of pulses of an address clock signal when a test signal attains “H” level, and outputs a group of address signals. Compared with a conventional SRAM to which the group of address signals is externally input, the number of external pins necessary when a test is conducted can be reduced, and a test board can be formed using a single-layer interconnection. Consequently, reduction of costs of testing is achieved.