I was just after some clarification with the following.
I've got 2 outputs going to 1 TTL input. If either output goes low the TTL input should go low (so its an OR operation in relation to going low, a AND relation in relation to being high).
1 output is from a ATmega, the other is from a comparitor with a open collector output. I think I can connect them directly as in the picture as it will be a wired OR, is that right?
I'm just not sure if say 1 output goes low will it sink alot of current from the other output and damage it?
Thanks for your help