Patent ID: 7884617

Claim:
An electro-static discharge (ESD) detection circuit, comprising: a first power pad, for receiving a first supply voltage; a second power pad, for receiving a second supply voltage, wherein a voltage level at the first supply voltage is different from a voltage level at the second supply voltage; a resistor-capacitor (RC) circuit, comprising: an impedance component, coupled between the first power pad and a first terminal; and a capacitive component, coupled between the first terminal and a second terminal, wherein the second terminal is not directly connected to the second supply voltage; a trigger circuit, coupled to the first power pad, the second power pad, and the RC circuit, for generating an ESD trigger signal according to a voltage level at the first terminal and a voltage level at the second terminal; and a bias circuit, coupled between the first power pad and the second power pad, for providing a bias voltage to the second terminal.