#74LS168

Description: Synchronous 4-bit Up/Down Decimal counter

Datasheet: http://www.ti.com/lit/gpn/sn74LS168

Pinout:

       +-----------+
U/~{D} |[ 1]   [16]| VCC
    CP |[ 2]   [15]| ~{TC}
    P0 |[ 3]   [14]| Q0
    P1 |[ 4]   [13]| Q1
    P2 |[ 5]   [12]| Q2
    P3 |[ 6]   [11]| Q3
~{CEP} |[ 7]   [10]| ~{CET}
   GND |[ 8]    [9]| ~{PE}
       +-----------+