#74LS51

Description: Dual 3- and 2-input AND-NOR ( S = /(AB[C] + DE[F]) )

Datasheet: http://www.ti.com/lit/ds/symlink/sn74ls51.pdf

Pinout:

    +-----------+
  ~ |[ 1]   [14]| VCC
  ~ |[ 2]   [13]| ~
  ~ |[ 3]   [12]| ~
  ~ |[ 4]   [11]| ~
  ~ |[ 5]   [10]| ~
  ~ |[ 6]    [9]| ~
GND |[ 7]    [8]| ~
    +-----------+