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您好 ,不用的输出端Y和Z可直接悬空。
对于输入端A来说,接地也是可行的,但是更倾向于上拉到VCC,这是因为如果输出短路引起的内部接地产生的偏置可能会对A端输入电流,如果工作在噪声比较大环境里这种情况很可能会发生,并且对器件造成损坏,建议是将A上拉。