[KenWittlief]

I looked at the data sheet from your postd link

they are 5VDC parts, so you dont need a series resistor - if you connected them to 5V (check your supply with a meter) and did not wire them backwards they should be ok.

how are you testing the output? meter or a scope would be best.

You do know that there are blinking leds (your testing LEDs maybe?) that look just like normal LEDs, right?