| 摘要 |
A write voltage source is capable of applying a write voltage, which is a high voltage. An antifuse is connected at one end to the write voltage source and has a resistance irreversibly variable based on the write voltage. A sense node is connectable to the other end of the antifuse. A sense amp compares the potential on the sense node with a reference potential. The sense node is used to accumulate charge thereon. To control the potential difference placed between both ends of the antifuse, a third transistor is provided having one end connected to the sense node. The third transistor is provided with a precharge voltage source on the other end, and a precharge controller operative to on/off control the gate.
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