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:
Dec. 01, 2009
Filed:
Jun. 11, 2007
Tatsuya Matano, Tokyo, JP;
Tatsuya Matano, Tokyo, JP;
Elpida Memory, Inc., Tokyo, JP;
Abstract
A semiconductor device includes an internal power supply line, a first power supply circuit, and second power supply circuits. The first power supply circuit includes an ordinary-voltage generation circuit supplying an ordinary voltage to the internal power supply line during an ordinary operation, and a test-voltage generation circuit supplying a test voltage to the internal power supply line during a test operation. Each of the second power supply circuits includes only an ordinary-voltage generation circuit. The number of ordinary-voltage generation circuits is thereby larger than the number of test-voltage generation circuits. Therefore, the ordinary voltage such as the precharge potential can be stably supplied to the internal power supply line while suppressing an increase in chip area.