Patent ID: 8345395
Filing Date: 2013-01-01
Classification: H02H

Abstract:
1. An electrostatic discharge protection circuit, comprising: a first electrostatic protection unit which transfers static electricity as a first and a second driving signal and discharges the static electricity to a first discharge line when the static electricity is generated in a pad; a second electrostatic protection unit which discharges the static electricity generated in the pad to a second discharge line in response to the first driving signal; and a third electrostatic protection unit which performs either discharge of the static electricity transferred to the first discharge line to the second discharge line or discharge of the static electricity transferred to the second discharge line to the first discharge line, wherein the first electrostatic protection unit comprises: a first electrostatic transferring unit which transfers the static electricity as the first driving signal in response to the static electricity generated in the pad; a second electrostatic transferring unit which transfers the static electricity corresponding to the first driving signal as the second driving signal in response to first driving signal; and an electrostatic discharge unit which discharges the static electricity corresponding to the second driving signal to the first discharge line in response to the second driving signal, wherein an output end of the first electrostatic transferring unit is commonly coupled to the second electrostatic transferring unit and the second electrostatic protection unit and an output end of the second electrostatic transferring unit is commonly coupled to the electrostatic discharge unit and the third electrostatic protection unit.