/diy/ - Do It Yourself

I want to use a 339 comparator to detect voltage and send the state to an arduino. My understanding is that the output is compatible with an arduino GPIO but it always reads low. I've tried four different chips and either they are all bad or maybe I have a mistake in my code.

So, the question is, can a 339 drive an arduino pin or do I need some other comparator?

link to 339 data sheet:

http://www.ti.com/lit/ds/symlink/lm2901.pdf