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. 10, 1984
Filed:
Oct. 09, 1981
Applicant:
Inventor:
Kazuhiro Toyoda, Yokohama, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365201 ; 365155 ; 365190 ;
Abstract
A semiconductor device, such as a bipolar semiconductor memory device, includes an internal circuit and a reference signal generating circuit. The difference in potential between at least one internal signal produced by the internal circuit and a reference signal, which is called a noise margin, is decreased during a test mode, rather than during a usual or normal mode, so that the device artificially obtains a high temperature state at room temperature.