#74LS138

Description: Decoder 3 to 8 active low outputs

Datasheet: http://www.ti.com/lit/gpn/sn74LS138

Pinout:

    +-----------+
 A0 |[ 1]   [16]| VCC
 A1 |[ 2]   [15]| O0
 A2 |[ 3]   [14]| O1
 E1 |[ 4]   [13]| O2
 E2 |[ 5]   [12]| O3
 E3 |[ 6]   [11]| O4
 O7 |[ 7]   [10]| O5
GND |[ 8]    [9]| O6
    +-----------+