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US 2008/0186789 A1Published application
Electric fuse circuit available as one time programable memory
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShinichi Sumi, Yasuhiro Agata, Masanori Shirahama, Toshiaki Kawasaki, Ryuji Nishihara
Life of this patent
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Abstract
A first transistor is connected in series with one end of a fuse element. A second transistor is connected in series with the other end of the fuse element. A current flows through the fuse element when both the first and second transistors are turned on.
Claims20
An electric fuse circuit which, during a programming operation, passes or does not pass a current through a fuse element to set the fuse element to one of a fused state and a non-fused state to program the fuse element, the electric fuse circuit comprising:
- the fuse element, a first switch transistor, and a second switch transistor, the first switch transistor being connected in series with one end of the fuse element and the second switch transistor being connected in series with the other end of the fuse element, or the fuse element being connected in series with one end of the first switch transistor and the second switch transistor being connected in series with the other end of the first switch transistor,
- wherein a current is passed through the fuse element when both the first and second switch transistors are turned on.
Dependencies are inferred from the claim text.