#74LS123

Description: Dual retriggerable Monostable

Datasheet: http://www.ti.com/lit/gpn/sn74LS123

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
      +-----------+