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The SY10/100EL57 are fully differential 4:1 multiplexers. By leaving the SELl line open (pulled LOW via the input pulldown resistors) the device can also be used as a differential 2:1 multiplexer with SELO input selecting between DO and Dl. The fully differential architecture of the EL57 makes it ideal for use in low skew applications such as clock distribution. The SELl is the most significant select line. The binary number applied to the select inputs will select the same numbered data input (i.e., 00 selects DO). Multiple VBB outputs are provided for single-ended or AC coupled interfaces. In these scenarios, the VBB output should be connected to the data bar inputs and bypassed via a O.01~F capacitor to ground. Note that the VBB output can source/sink up t0 0.5mA of current without upsetting the voltage level.