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SN74LVC1G80-Q1: D触发器作简单的分频处理,未达到理想效果,帮忙解决一下

Part Number: SN74LVC1G80-Q1

将一个10hz的信号输入分频成为5hz,电路如下 ,OVERRIDE暂时悬空,经过测试没有得到想要的输出,而且示波器探头好像对输出也有影响

  10hz输入

 实测输出,信号间隔不一致

  输入输出一起测,明显不对

请问这是什么原因