#74LS253

Description: Dual Multiplexer 4 to 1, 3-State Outputs

Datasheet: http://www.ti.com/lit/gpn/sn74LS253

Pinout:

    +-----------+
OEA |[ 1]   [16]| VCC
 A1 |[ 2]   [15]| OEB
I3A |[ 3]   [14]| A0
I2A |[ 4]   [13]| I3B
I1A |[ 5]   [12]| I2B
I0A |[ 6]   [11]| I1B
 ZA |[ 7]   [10]| I0B
GND |[ 8]    [9]| ZB
    +-----------+