You made a mistake or use a simulationprogram.
Upload your program so we can see what is wrong.
Fri Feb 5 2016, 06:52:19
(no subject)(by jqleandro)
Remember Tof is off_delay, in other words, when the input go ON to OFF, it turn on for the time set, if it receive another pulse, before it set time is off, it always will be ON in the output