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:
May. 16, 2006
Filed:
Nov. 05, 2004
Toshimitsu Taniguchi, Ota, JP;
Toshiyuki Ohkoda, Ora-gun, JP;
Toshimitsu Taniguchi, Ota, JP;
Toshiyuki Ohkoda, Ora-gun, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
This invention offers a ROM in which a user can program his digital data. In a memory cell array of the ROM, in which a plurality of interlayer insulation layers and a plurality of metal layers (including a bit line which makes an uppermost layer) are alternately stacked over each memory transistor, an insulation layer is formed on a tungsten plug in a first contact hole provided in a first interlayer insulation layer. The ROM is programmed by writing digital data '1' or '0' in each of the memory transistors according to whether a dielectric breakdown of the insulation layer is caused by a predetermined programming voltage (high voltage) applied from the bit line.