#74LS42

Description: 4 to 10 line Decoder

Datasheet: http://www.ti.com/lit/gpn/sn74LS42

Pinout:

    +-----------+
  0 |[ 1]   [16]| VCC
  1 |[ 2]   [15]| A0
  2 |[ 3]   [14]| A1
  3 |[ 4]   [13]| A2
  4 |[ 5]   [12]| A3
  5 |[ 6]   [11]| 9
  6 |[ 7]   [10]| 8
GND |[ 8]    [9]| 7
    +-----------+