To reduce EMI, a frequency synchronization pin allows multiple ICs from the family to self-synchronize or to synchronize to an external clock.

为了减少EMI，一个频率同步的引脚允许此系列的多重IC实现自同步或与外部时钟同步。

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At first blush, you might think that you could simply cascade two counters together using the carry-out pin, Pin 12, from one counter to feed the clock-input pin, Pin 14, of a second counter.

初看上去，也许会考虑使用动作管脚（管脚12）从一个计数器接到第二个计数器的时钟输入管脚（管脚14），简单的级联两个计数器。

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At first blush, you might think that you could simply cascade two counters together using the carry-out pin, Pin 12, from one counter to feed the clock-input pin, Pin 14, of a second counter.

初看上去，也许会考虑使用动作管脚（管脚12）从一个计数器接到第二个计数器的时钟输入管脚（管脚14），简单的级联两个计数器。

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