Patent ID: 8760905

Claim:
A semiconductor device comprising: an electric fuse including a filament having a first conductive layer and a second conductive layer on the first conductive layer, wherein, the semiconductor device is configured such that at least three discernible resistive states are generated in the filament of the electric fuse by changing of a combination of a state of the first conductive layer and a state of the second conductive layer, the at least three discernible resistive states including an initial state, a first resistive state, and a second resistive state, the semiconductor device being configured (i) to set a first blow condition under which a first electric current is caused to flow through the filament to generate the first resistive state and (ii) to set a second blow condition, different from the first blow condition, under which a second electric current is caused to flow through the filament to generate the second resistive state.