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. 06, 2004
Filed:
Oct. 22, 2002
Applicant:
Inventors:
Katsuhiro Mori, Kawasaki, JP;
Shinya Fujioka, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 3/128 ;
U.S. Cl.
CPC ...
G01R 3/128 ;
Abstract
Operating margins of a semiconductor integrated circuit are reliably tested at low power consumption by switching power supply circuits between normal operation mode wherein a first step-up power supply serves both memory core and a step-down power supply, and testing mode wherein the memory core is powered by an external testing power supply that provides a fluctuating voltage for testing, and the step-down power supply is served by a second step-up power supply.