#74LS155

Description: Dual 2 to 4 lines Decoder/Demultiplexer

Datasheet: http://www.ti.com/lit/gpn/sn74LS155

Pinout:

    +-----------+
EA1 |[ 1]   [16]| VCC
EA2 |[ 2]   [15]| EB2
 A1 |[ 3]   [14]| EB1
Q3A |[ 4]   [13]| A0
Q2A |[ 5]   [12]| Q3B
Q1A |[ 6]   [11]| Q2B
Q0A |[ 7]   [10]| Q1B
GND |[ 8]    [9]| Q0B
    +-----------+