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关于CD74HC4053的疑问



您好:

我使用CD74HC40534053进行电路选择,SWT信号是通过GPIO进行控制,AN是输出信号。输入0V或者3.3V。根据IC函数表,当S0 S1 S2均为低时,在我的电路中选择A0输入,当S0为高,S1 S2为低时,选择A1输入。可是为什么不管我怎样控制S0和输入(FILTER),在输出端均得到0.95V电压?