Protection circuit

摘要

A protection circuit is coupled between a chipset and an I/O port. The protection circuit comprises at least two protection devices and a control device. The protection devices are coupled in parallel with each other, and coupled between the I/O port and the chipset. The protection devices receive an input signal from the I/O port When the I/O port has a surge current thereon, the protection devices perform a discharge operation for the surge current. The control device selects one of the protection devices to transmit the input signal t the chipset.