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:
Jul. 13, 1999
Filed:
Oct. 21, 1997
Applicant:
Inventors:
Woon-Kyung Lee, Seoul, KR;
Eui-Do Kim, Daegukwangyeok, KR;
Assignee:
SAmsung Electronics, Co., Ltd., Suwon-city, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36523003 ; 36518903 ;
Abstract
A NOR-type mask ROM reduces the resistance ratio of buried diffusion layers and improves the drive capacity of bank selection transistors by utilizing sub-bit line selection transistors located near the center of a memory cell array. The sub-bit line selection transistors are connected to a pair of sub-bank selection lines that divide the memory cell array into symmetric upper and lower portions. The bank selection transistors couple alternate sub-bit lines to main bit lines at both ends of the sub-bit lines, thereby forming a dual current path between the main bit lines and the memory cells coupled to the sub-bit lines.