#74LS221

Description: Dual Monostable

Datasheet: http://www.ti.com/lit/gpn/sn74LS221

Pinout:

       +-----------+
  ~{A} |[ 1]   [16]| VCC
     B |[ 2]   [15]| RCEXT
~{CLR} |[ 3]   [14]| CEXT
  ~{Q} |[ 4]   [13]| Q
     Q |[ 5]   [12]| ~{Q}
  CEXT |[ 6]   [11]| ~{CLR}
 RCEXT |[ 7]   [10]| B
   GND |[ 8]    [9]| ~{A}
       +-----------+