se555定时器当触发输入为<1/3VDD是,阈值输入为>2/3VDD是SR锁存器处于不确定状态,是否与手册中功能表相矛盾????
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se555定时器当触发输入为<1/3VDD是,阈值输入为>2/3VDD是SR锁存器处于不确定状态,是否与手册中功能表相矛盾????
您好,您所说的我知道输出管脚是3,但是如果从555计时器内部电路图推功能的时候,发现当触发输入<1/3VDD,如果阈值输入>2/3VDD时,计时器输出功能在我们测试时并不一定为高,有时为低,有时为高。与真值表的阈值输入不相干有点矛盾