Patent ID: 7911752

Claim:
An electrostatic discharge (ESD) protection circuit electrically connected to a core circuit for preventing ESD charges from reaching the core circuit, the ESD protection circuit comprising: a pad; a pass transistor having a first electrode electrically connected to the pad, a second electrode electrically connected to the core circuit, and a control electrode electrically connected to a first node; a transistor having a first electrode electrically connected to the pad, a second electrode electrically connected to a low power supply, and a control electrode electrically connected to a second node; a capacitor having a first electrode electrically connected to the pad, and a second electrode electrically connected to the control electrode of the transistor; a resistor having a first electrode electrically connected to the control electrode of the transistor, and a second electrode electrically connected to the low power supply; and a delay trigger unit having an input terminal electrically connected to the second node, and an output terminal electrically connected to the first node.