Electrostatic discharge circuit

An electrostatic discharge (ESD) circuit connected with an internal circuit, the ESD circuit comprising:

• a first voltage division circuit connected between a first power pad and a first node, wherein the first voltage division circuit generates a first voltage;
• a RC control circuit connected between the first power pad and a second power pad, wherein the RC control circuit generates a second voltage and a third voltage;
• a voltage selection circuit connected with the first node and the RC control circuit, wherein the voltage selection circuit receives the first voltage and the second voltage, and outputs a fourth voltage, wherein if the first voltage is higher than the second voltage, the fourth voltage is equal to the first voltage, wherein if the second voltage is higher than the first voltage, the fourth voltage is equal to second voltage;
• a first transistor, wherein a first terminal of the first transistor is connected with the first power pad, a second terminal of the first transistor is connected with a second node, and a gate terminal of the first transistor receives the first voltage;
• a second transistor, wherein a first terminal of the second transistor is connected with the second node, a second terminal of the second transistor is connected with the second power pad, and a gate terminal of the second transistor receives the third voltage;
• and
• a third transistor, wherein a first terminal of the third transistor is connected with the first power pad, a second terminal of the third transistor is connected with the internal circuit, and a gate terminal of the third transistor receives the fourth voltage.