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:
Jun. 05, 2007
Filed:
Apr. 28, 2003
Applicants:
Jhyy-cheng Liou, Jubei, TW;
Chin-hsi Lin, Hsinchu, TW;
Inventors:
Jhyy-Cheng Liou, Jubei, TW;
Chin-Hsi Lin, Hsinchu, TW;
Assignee:
Solid State System Co., Ltd., Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 29/76 (2006.01); G11C 17/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A contactless Mask ROM is described, comprising a plurality of MOS-type memory cells. The memory cells include a plurality of first memory cells and a plurality of second memory cells. The first memory cells have a first channel conductivity so that they are depletion-mode MOS transistors, and the second memory cells have a second channel conductivity so that they are enhanced-mode MOS transistors. In the contactless Mask ROM, a memory cell shares two diffusions with two adjacent memory cells that are aligned with the memory cell along a first direction.