#74LS157

Description: Quad 2 to 1 line Multiplexer

Datasheet: http://www.ti.com/lit/gpn/sn74LS157

Pinout:

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