| 摘要 |
An electro-static discharge protection circuit is provided to lower an operation voltage of the electro-static discharge protection circuit and to be rapidly turned on by forming a trigger unit. A main discharge unit(20) discharges static electricity flowed from a pad(P2) to a first power line or a second power line. A power clamp unit(24) discharges the static electricity discharged to the first power line or the second power line. A trigger unit(26) is connected between one of the first and second power lines and the pad to detect a detection voltage by the static electricity and to drive the main discharge unit and the power clamp unit. The main discharge unit has a PMOS transistor(P20) and NMOS transistors(N20,N24). The PMOS transistor is connected between the first power line and the pad. A gate and a drain of the PMOS transistor are connected to each other. The NMOS transistors are connected between the second power line and the pad. A gate of the NMOS transistor receives the detection voltage.
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