Patent ID: 8035937
Filing Date: 2011-10-11
Classification: H01L,H03K

Abstract:
1. An electrostatic discharge circuit, comprising: a main electrostatic discharge section configured to discharge static electricity inputted to an input/output pad to at least one voltage line; an input impedance section configured to adjust an amount of current flowing from the input/output pad depending upon a frequency of an input signal of the input/output pad; an auxiliary electrostatic discharge section connected to the input impedance section and configured to discharge the static electricity inputted to the input/output pad to the at least one voltage line; and an input buffer connected between the auxiliary electrostatic discharge section and an internal circuit, wherein the input impedance section includes a resistor element and a capacitor element which are connected in parallel between the input/output pad and the auxiliary electrostatic discharge section and are each connected directly to each of the input/output pad and the auxiliary electrostatic discharge section.