#74LS161

Description: Synchronous 4-bit programmable binary Counter

Datasheet: http://www.ti.com/lit/gpn/sn74LS161

Pinout:

      +-----------+
~{MR} |[ 1]   [16]| VCC
   CP |[ 2]   [15]| TC
   D0 |[ 3]   [14]| Q0
   D1 |[ 4]   [13]| Q1
   D2 |[ 5]   [12]| Q2
   D3 |[ 6]   [11]| Q3
  CEP |[ 7]   [10]| CET
  GND |[ 8]    [9]| ~{PE}
      +-----------+