1. 输入脉冲触发方式
上升沿触发 下降沿触发
19.01.2021
a
12
2. 不可重复触发型与可重复触发型
图（a）为不可重复
图 （ b ） 为 可 重 复 型触发单稳态触发器
触发型单稳态触发器
该电路在触发进入暂
该电路在触发进入 稳态期间如再次受到触
暂稳态期间如再次被 发，对原暂稳态时间没
触发，则输出脉冲宽 有影响，输出脉冲宽度
耦合，使uI2产生负跳变，G2输出uO产生正跳变；uO 的正跳变反馈到G1输入端，从而导致如下正反馈过程：
19.01.2021
a
5
使电路迅速变为G1导通、G2截止的状态，此时， 电路处于uO1=UOL、uO=uO2=UOH的状态。然而这一 状态是不能长久保持的，故称为暂稳态。
19.01.2021
a
17
2. 脉冲定时
单稳态触发器能够产生一定宽度tw的矩形脉冲， 利用这个脉冲去控制某一电路，则可使它在tw时间 内动作(或者不动作)。
19.01.2021
图6-19 a脉冲定时
18
作业题
6-3
19.01.2021
a
19
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