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# 第三节 脉冲触发的触发器 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '第三节 脉冲触发的触发器' - dale

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Presentation Transcript

• 电路结构和工作原理
• 脉冲触发方式的动作特点

1. 主从SR触发器

CLK=1时，主触发器根据S、R的状态翻转，

CLK从1返回0时，主触发器状态在CLK=0期间不再改变，

2. 主从JK触发器

J= 1 , K= 0 , CLK下降沿时触发器置 1。

J= 0 , K= 1 , CLK下降沿时触发器置 0。

J= K= 0 , 触发器保持原状态不变。

J= 1, K= 1, CLK下降沿时触发器翻转。

&

&

CLK

O

t

J

O

t

K

O

t

Q

O

t

Q'

O

t

[例5.3.1]在主从JK触发器电路中，若CLK、J、K的波形如图所示，试画出Q、 Q'端对应的电压波形。假定触发器的初始状态为Q=0。

• 触发器的翻转分两步动作。

2. 因为主触发器本身是一个电平触发SR触发器，所以在CLK=1的全部时间里输入信号都将对主触发器起控制作用。