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:
Apr. 24, 2001
Filed:
Apr. 14, 2000
Applicant:
Inventors:
Yasuhiro Matsumoto, Hyogo, JP;
Hiroshi Akamatsu, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 1/604 ;
U.S. Cl.
CPC ...
G11C 1/604 ;
Abstract
An external terminal and an internal power supply node to an internal circuit are connected via first and second transistors. In a test operation mode, the first and second transisters are turned on and potential is accordingly supplied to the internal circuit from the terminal. In a normal operation mode, a third transistor placed between the terminal and the gate of the first transistor is turned on so that the gate of the first transistor is coupled to the external terminal and the second transistor is turned off. Undershoot to the terminal is not transmitted to the inside since the first transistor is turned off.