#74LS154

Description: Decoder 4 to 16

Datasheet: http://www.ti.com/lit/gpn/sn74LS154

Pinout:

    +-----------+
 S0 |[ 1]   [24]| VCC
 S1 |[ 2]   [23]| A0
 S2 |[ 3]   [22]| A1
 S3 |[ 4]   [21]| A2
 S4 |[ 5]   [20]| A3
 S5 |[ 6]   [19]| E1
 S6 |[ 7]   [18]| E0
 S7 |[ 8]   [17]| S15
 S8 |[ 9]   [16]| S14
 S9 |[10]   [15]| S13
S10 |[11]   [14]| S12
GND |[12]   [13]| S11
    +-----------+