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US007139216B2
(12) United States Patent ao) Patent No.: Us 7,139,216 B2
Higashi et al. (45) Date of Patent: Nov. 21,2006
(54) SEMICONDUCTOR STORAGE DEVICE
HAVING A COUNTER CELL ARRAY TO
STORE OCCURRENCE OF ACTIVATION OF
WORD LINES
(75) Inventors: Tomoki Higashi, Kanagawa (JP);
Takashi Ohsawa, Kanagawa (JP)
(73) Assignee: Kabushiki Kaisha Toshiba, Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 10/864,632
(22) Filed: Jun. 10, 2004
(65) Prior Publication Data
US 2005/0195680 Al Sep. 8, 2005
(30) Foreign Application Priority Data
Mar. 2, 2004 (JP) 2004-057703
(51) Int. CI.
G11C 8/00 (2006.01)
G11C11/34 (2006.01)
(52) U.S. CI 365/236; 365/182; 365/222
(58) Field of Classification Search 365/185.25,
365/222, 236 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
5,251,177 A * 10/1993 Akamatsu et al 365/222
