施耐德PLC TSXDEY16D3

施耐德PLC TSXDEY16D3

施耐德PLC TSXDEY16D3

复杂性：——（1）同步计数器中的所有触发器都与时钟协调，因此与异步计数器相比，其设计和实现复杂。（2）在异步计数器中，一个触发器的输出作为下一个触发器的输入，因此其设计和实现非常简单。

·顺序：——（1）同步计数器可以在任何所需的计数序列中运行，因为它可以通过更改时钟序列来进行操作。（2）异步计数器只能以固定的计数顺序运行，即UP和DOWN。

·延迟：——（1）在同步计数器的情况下没有观察到传播延迟。（2）在异步计数器的情况下，从一个触发器到另一个触发器存在后续传播延迟。

同步计数器中的所有触发器都使用相同的时钟输入同时计时。相反，异步计数器的组成触发器在不同的时刻用不同的输入信号计时。

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