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CD4017BPWR使用问题?



电路原理图如图1所示:利用U3的输出信号经过RC延时后进行对自己复位,从Q信号开始到其延时至U3第15引脚起作用的时间为RST时间,正常情况下为10us左右,但故障器件使用Q3进行工作时出现RST信号有缺失的情况,有时有有时没有,请帮忙分析原因?