View cd4051be datasheet:

CD4051BE IL00 C-MOS 8-CHANNEL ANALOG MULTIPLEXER/DEMULTIPLEXER —TOP VIEW— CONTROL INPUTS 13 X0 SELECTED X4 I/O 1 VDD 16 SELECT 14 X1 EN CHANNEL C B A 15 X2 X6 I/O 2 15 X2 I/O 0 0 0 0 X0 12 X3 0 0 0 1 X1 1 X4 XC 3 XC I/O 3 14 X1 I/O 0 0 1 0 X2 5 X5 0 0 1 1 X3 2 X6 X7 I/O 4 13 X0 I/O 0 1 0 0 X4 4 X7 0 1 0 1 X5 6 X5 I/O 5 12 X3 I/O EN OPEN 0 1 1 0 X6 0 1 1 1 X7 A B C EN I/O 6 11 A IN 11 10 9 1 x x x OPEN 0 : LOW LEVEL 7 VEE 10 B IN 1 : HIGH LEVEL X0 to X7 : ANALOG INPUTS/OUTPUTS x : DON’T CARE XC : COMMON INPUT/OUTPUT 8 GND 9 C IN A, B, C : CHANNEL SELECT INPUT EN : ENABLE INPUT