只要复位脉冲低，输出就低。为防止误触发，当不用“复位“的时候，”复位“端应和Vcc端相连。
The output is held low as long as the reset pulse is low. To prevent false triggering, when RESET is not used, it should be connected to VCC.
应用一个负的触发器脉冲在一个定时周期内来同时复位和触发，这样使电容器C放电并且重新初始化一个循环，从复位脉冲的正边开始启动。
Applying a negative-going trigger pulse simultaneously to RESET and TRIG during the timing interval discharges C and reinitiates the cycle, commencing on the positive edge of the reset pulse.
有手动复位和电气输出信号的脉冲计数器。
有手动复位和电气输出信号的脉冲计数器。
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