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双路D触发器SN74AC74问题

Other Parts Discussed in Thread: SN74AC74

SN74AC74将CLK和D端使用同一个信号,PRE固定为高,CLR可控制,先将CLR拉高,CLK和D输入上升沿,Q输出高,将CLR拉低,Q输出为低,然后将CLR拉高,再将CLK和D端从高拉低的过程中(下降沿),Q输出从0变为高,请问大神是什么原因造成的呢?规格书上显示上升沿动作,怎么会下降沿也动作呢?谢谢