#74LS399

Description: Quad 2 to 1 line multiplexer with storage

Datasheet: http://www.ti.com/lit/gpn/sn74LS399

Pinout:

    +-----------+
  S |[ 1]   [16]| VCC
 QA |[ 2]   [15]| QD
I0A |[ 3]   [14]| I0D
I1A |[ 4]   [13]| I1D
I1B |[ 5]   [12]| I1C
I0B |[ 6]   [11]| I0C
 QB |[ 7]   [10]| QC
GND |[ 8]    [9]| CP
    +-----------+