An embodiment of a driving circuit is provided. The driving circuit is coupled to an I/O pad. The driving circuit includes an output driver, a first termination resistor, a second termination resistor and a monitoring circuit. The output driver outputs an output data via the I/O pad. The first termination resistor and the second termination resistor are coupled to a node between the output driver and the I/O pad. The monitoring circuit monitors a first current passing through the first termination resistor and adjusts resistance of the first termination resistor and the second termination resistor according to the first current.