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:
Aug. 27, 2013
Filed:
Nov. 16, 2011
Jung Ryul Ahn, Namyangju-si, KR;
Sang Hyun OH, Anyang-si, KR;
Jum Soo Kim, Suwon-si, KR;
SK Hynix Inc., Gyeonggi-do, KR;
Abstract
A method of operating a semiconductor memory device includes a memory array having memory cell strings including a first and a second memory cell groups having memory cells, a first and a second dummy elements, a drain select transistor and a source select transistor, wherein the first memory cell group and the second memory cell group are arranged between the drain select transistor and the source select transistor; connecting electrically the first memory cell group to the second memory cell group during a program operation or a read operation of the first memory cell group or the second memory cell group; and performing separately an erase operation of the first memory cell group and an erase operation of the second memory cell group, selecting simultaneously one of the first dummy element and the second dummy element during the erase operation of the selected memory cell group.