Semiconductor device, semiconductor system and switching power device

Abstract

The present disclosure provides a semiconductor device, including: a synchronous input terminal; a synchronous output terminal; a functional circuit, having a reference clock signal generating circuit operable to generate a reference clock signal; a signal output circuit, connected to the synchronous output terminal; and a mode setting circuit, for setting an operation mode of the functional circuit and the signal output circuit to a first mode or a second mode through a mode determination process. The functional circuit is operable to perform a predetermined functional operation in synchronization with the reference clock signal in the first mode, and perform the functional operation in synchronization with an input clock signal transmitted to the synchronous input terminal from another semiconductor device in the second mode. The signal output circuit is operable to output a clock signal based on the reference clock signal from the synchronous output terminal in the first mode.