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CD4013B: 电路逻辑

您好:

我实测了一下电路。

像第三行的逻辑真值表,set和reset都是0,D下拉100K到GND,同时接到了Q非上。

第一次clock下降沿,Q输出高电平;

第二次clock下降沿,Q输出低电平。

这怎么理解呢?