Patent ID: 8749932
Filing Date: 2014-06-10
Classification: H01L,H03K

Abstract:
1. A protection circuit, comprising: a first power supply system comprising a first power supply and a first ground; a second power supply system comprising a second power supply and a second ground, the second power supply system being connected to the first power supply system via a signal line through which signal transfer is performed between a circuit in the first power supply system and a circuit in the second power supply system; and a control circuit that, when coupled to an electro-static discharge (ESD) stress being applied to the first power supply system, controls a first switch, wherein said first switch is provided between the signal line and the first ground, and wherein the control circuit comprises a capacitance element, a resistance element in series with the capacitance element, and an inverter, an output of said inverter being connected between a gate of the first switch, an input of said inverter being connected to a connecting point between the capacitance element and the resistance element.