Patent ID: 8705219

Claim:
An electrostatic discharge protection circuit comprising: a first power line configured to provide a first power supply voltage; a second power line configured to provide a second power supply voltage; a ground line connected to a ground voltage terminal; at least two stack transistors connected in series between the first power line and the ground line; a first resistor connected between the first power line and a first node; a first transistor and a first capacitor connected in series between the first node and the ground line; a second transistor, connected between the second power line and a second node, and having a gate connected to the ground line; a third transistor, connected between the first power line and a third node, and having a gate connected to the first node; an inverter, connected between the third node and the ground line, and having an input connected to the second node; a fourth transistor, connected to the first power line, and having a gate connected to the second node; and a fifth transistor, connected between the second power line and the third node, and having a gate connected to a terminal of the fourth transistor, wherein a gate of the first transistor is connected to the third node.