你好,SN74HC164在上电初始时,不给时钟,不给输入数据脚为低电平,CLR脚接VCC的时候。输出脚是什么状态呢
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您好,
TI的移位寄存器在通电时没有默认状态。在数据随时钟通过之前,输出处于“未知”状态。这是因为用于存储输出值的底层锁存电路在启动时不稳定,可能输出低电平也可能输出高电平,具体见FAQ:
[FAQ] What is the default output of a latched device? (Flip-Flop, latch, register)