#74LS158

Description: Quad 2 to 1 multiplexer

Datasheet: http://www.ti.com/lit/gpn/sn74LS158

Pinout:

    +-----------+
  S |[ 1]   [16]| VCC
I0A |[ 2]   [15]| E
I1A |[ 3]   [14]| I0C
 ZA |[ 4]   [13]| I1C
I0B |[ 5]   [12]| ZC
I1B |[ 6]   [11]| I0D
 ZB |[ 7]   [10]| I1D
GND |[ 8]    [9]| ZD
    +-----------+