4098
Dual monostable multivibrator, retriggerable, resettable.

       +----------+
 1Cext |1  +--+ 16| VCC
1RCext |2       15| 2Cext
  1RST |3       14| 2RCext
   1TR |4       13| 2RST
  /1TR |5  4098 12| 2TR
    1Q |6       11| /2TR
   /1Q |7       10| 2Q
   GND |8        9| /2Q
       +----------+