In electronics and especially synchronous digital circuits, a clock signal is a particular type of signal that oscillates between a high and a low state and utilized like a metronome to coordinate actions of circuits.

在电子学，特别是同步数字电路中，时钟信号是一种特殊类型的信号，在高和低状态之间振荡，像节拍器一样用来协调电路的动作。

Clock signal is a periodic signal and its ON time and OFF time need not be the same. You can represent the clock signal as a square wave, when both its ON time and OFF time are same.

时钟信号是一个周期信号，其 ON 时间和 OFF 时间不必相同。你可以把时钟信号表示为方波，此时它的 ON 和 OFF 时间长短等同。

The reciprocal of the time period of a clock signal is known as the frequency of the clock signal. All sequential circuits are operated with clock signal. So, the frequency at which the sequential circuits can be operated accordingly the clock signal frequency has to be chosen.

时钟信号时间周期的倒数称为时钟信号的频率。所有的时序电路都是用时钟信号操作的。因此，时序电路的工作频率必须与时钟信号的频率相对应。

If more than one clock signal is used in the system, problems can arise because of the different clock signal delays. These originate partly from internal delays in the clocking circuits and drivers and partly from the clock wires on the chip.

如果在系统中使用一个以上的时钟信号，由于时钟信号的延迟不同，会存在产生问题的可能性。这些部分源于时钟电路和驱动器的内部延迟，部分源于芯片上的时钟线路。