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https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/815102/tmux1208-floating-input-pin-source-sx
未使用的输入引脚(源极)：是否允许它们保持未连接状态？
Sx 和 D 引脚可保持断开状态。 只有输入引脚(Ax、EN)需要具有有效的逻辑电平。
