A low pulse on this pin (below 1/3 of VCC) sets the internal flip-flop and makes the output go HIGH. When the voltage on this pin reaches 2/3 of VCC, it resets the flip-flop, and the output goes LOW.
I think that I have about average circuit board design and soldering skills for an (older) mechanical engineer. As currently, mostly a hobbiest developer, I tend to develop reusable functionality ...