Looking for a chip? Help

[polishedball]

Looking to see if such a ttl chip exists. I need a 2 inputs 3 output. Basically if a logic line was high it would take an output high and if both were high it would take a 3rd out high. I have 3 ttl devices left to control but only 2 control lines left.

I know I can do this with a PLD but to program a 22v10 seems a bit overkill for my needs.
Is there an option I am missing? It's late and I haven't thought through building it out of and ors n nors but perhaps that is possible.

John.

[ekeefe]

Hello,

If I understand you correctly, you have two controllable lines that you need to decode and drive three outputs. This sound like a binary decoder. This would allow you to control up to four output lines from two inputs. For example, if your inputs were:

00 - Output 1 would be active
01 - Output 2 would be active
10 - Output 3 would be active
11 - Output 4 would be active

If this is what you are looking for, it can be done with a 74139 chip. This chip has active low outputs.

I hope this helps.

ED

[polishedball]

Perfect, ah how easily I forgot about that chip. Thanks!

Hello,

If I understand you correctly, you have two controllable lines that you need to decode and drive three outputs. This sound like a binary decoder. This would allow you to control up to four output lines from two inputs. For example, if your inputs were:

00 - Output 1 would be active
01 - Output 2 would be active
10 - Output 3 would be active
11 - Output 4 would be active

If this is what you are looking for, it can be done with a 74139 chip. This chip has active low outputs.

I hope this helps.

ED