Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

2006-08-01

2006-08-01

Elms, Richard (Department: 2824)

Static information storage and retrieval

Interconnection arrangements

C365S185200, C365S203000, C365S210130

Reexamination Certificate

active

07085148

ABSTRACT:
A semiconductor memory device having a semiconductor substrate includes a plurality of reference cells4and a plurality of bit lines10. The reference cells4are formed in a region near the centerline of a predetermined region of the semiconductor substrate which is perpendicular to the bit lines10. The bit lines10form pairs each composed of two adjacent bit lines. Two bit lines10in each pair have a first parallel state and a second parallel state in which positions of the two bit lines are reversed from the first parallel state. Each pair of bit lines10has at least one cross section11where one of the pair of bit lines10crosses the other, to switch between the first parallel state and the second parallel state. The cross section11is provided in the predetermined region of the semiconductor substrate such that the length of a bit line10in the first parallel state is equal to the length of the bit line10in the second parallel state. The semiconductor memory device is reduced in size.

REFERENCES:
patent: 5062077 (1991-10-01), Takashima et al.
patent: 5214601 (1993-05-01), Hidaka et al.
patent: 6707701 (2004-03-01), Ashikaga
patent: 6721198 (2004-04-01), Kang
patent: 2003/0063508 (2003-04-01), Ashikaga
patent: 2003/0099125 (2003-05-01), Kang
patent: 2005/0157531 (2005-07-01), Yamaoka et al.
patent: WO 97/36300 (1997-10-01), None
Kawai, Tomoji, “IC memory that does not lose its data—all about FRAM-(Kienai IC memory-FRAM no subete-)” Jun. 22, 1998, Second Impression of the First Edition, pp. 29-33.

Affiliated with

Also associated with

Rating

Semiconductor memory device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Semiconductor memory device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semiconductor memory device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3614617