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:
Sep. 07, 2010
Filed:
Apr. 27, 2007
Applicants:
Masakazu Ishino, Tokyo, JP;
Hiroaki Ikeda, Tokyo, JP;
Inventors:
Masakazu Ishino, Tokyo, JP;
Hiroaki Ikeda, Tokyo, JP;
Assignee:
Elpida Memory, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 23/48 (2006.01); H01L 21/44 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor package includes a uniform thin insulating film covering the internal circuit formed on a silicon substrate. A plurality of thick island insulating films are formed underlying respective pad electrodes, which connect the internal circuit to an external circuit. The silicon substrate is polished from the bottom to have a thickness less than 0.6 mm. The thick island insulating films reduces an electrostatic capacitance of the pad electrodes to reduce the propagation delay of a signal passing through the pad electrodes.