Patent ID: 8514648

Claim:
A semiconductor device including an anti-fuse, the anti-fuse comprising: a semiconductor substrate including a top surface and a bottom portion, the bottom portion of the semiconductor substrate having a first conductivity type; an isolation region disposed inward from the top surface of the semiconductor substrate to a first depth; a channel diffusion region disposed inward from the top surface of the semiconductor substrate to a second depth, the second depth located at a depth where the channel diffusion region meets an upper boundary of the bottom portion of the semiconductor substrate, wherein the channel diffusion region is surrounded by the isolation region, wherein the first depth is a greater distance from the top surface of the semiconductor substrate than the second depth, and wherein the channel diffusion region has a second conductivity type opposite to the first conductivity type; a gate oxide layer disposed on the channel diffusion region; and a gate electrode disposed on the gate oxide layer to cover a top surface of the gate oxide layer; the semiconductor device further including: a memory cell array connected to word lines and column selection lines; a column decoder configured to decode column address signals, generate column selection signals, and transmit the column selection signals to the column selection lines; a row decoder configured to decode row address signal and generate row address signals; and one or more of: a redundant memory cell array connected to redundant word lines and redundant column selection lines; a redundant column decoder configured to decode the column address signals, generate redundant column selection signals, and transmit the redundant columns selection signals to the redundant column selection lines when a defect occurs in the column decoder or at least one of the column selection lines, and a redundant row decoder configured to decode the row address signals and generate redundant row address signals when a defect occurs in the decoder.