Provided is a semiconductor device where a signal-transmission speed. The semiconductor device comprises a first logic element, a first switch electrically connected to the first logic element, and a second logic element electrically connected to the first switch. The first logic element includes at least a second switch, and the second switch has a function of setting an output potential from the first logic element to a L level. The first logic element may include a memory electrically connected to a register. The memory has a function of holding data of the register, and the register has a function of setting an output potential to a L level after holding the data in the memory.