Since the single-ended system transmits signals with a single signal line, there is a merit that the number of signal lines is small, but there is a limit in speed because it is susceptible to external noise. To transmit a large amount of signals quickly, it is necessary to increase the number of signal lines and parallel transmission, so the disadvantage is bigger in high-speed signal applications. On the other hand, in the differential transmission method, the external noise added to the signal line can be canceled at the time of reception in order to see the potential difference between the two signal lines, so it is the greatest merit that it is resistant to noise. Since it is resistant to noise, it is possible to suppress the voltage amplitude of the signal to a low level, it is possible to shorten the rise/fall time of the signal and to increase the speed.