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https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/822234/cd74hc4053-how-to-connect-unused-pins
您好！ 如果不与以下引脚配合使用、是否可以悬空？ ・A：B：C [0-1]输入/输出引脚 ・COM A：B OUT/IN 引脚 此致、 YUto Sakai
始终只有数字输入需要有效的逻辑电平。
A/B/C 0/1/COM 引脚专为模拟信号而设计、允许悬空。
