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Sign up using Email and Password. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Sign up or log in Sign up using Google. I’m not doubting your answer – I just don’t understand why: No that won’t work. I don’t think it’ll fry anything, but since s aren’t open-collector gates, if you connect two outputs together and they’re not both high or low at the same time, the output logic level will be undefined and can’t be guaranteed to be either a 1 or a zero.

And thank you for teaching me how to ask questions here: If they’re not both high or low at the same time Thanks so much for the answer. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Following is the schematic from TI’s data sheet so you can see what’s going on in there, and what logic function do you want to implement? I’m thinking that I can just use a ?


I will connect two Yx pins to two two separate input pins on the N. It’s unconventional, but clear what you meant in your question now.

7404 – 7404 Hex Inverter Datasheet

Basically if one of them wants to be high and the other wants to be low, they will compete and force limiting currents through each other, very likely damaging them, because you cannot guarantee in any case that they will go high or low at the same time, since then you’d have to tie both inputs together as well. Is it OK for the output pins to be high?

What you are doing with the two outputs is not okay. It is not clear under what conditions you want to enable the Micro-Kim expansion port. The comment was really more for the OP’s benefit to help him work out his logic. Or, better yet, can you complete this truth table?: You can use a instead of the Can you explain to me why it won’t work? Email Required, but never shown.

digital logic – N and high output – Electrical Engineering Stack Exchange

Will switch to use the ‘ Since the 74LS has active low outputs, the Datazheet and Y7 outputs will never both be low at the same time. The has open-collector outputs.

I didn’t know about that concept and will read up on it. Thanks for mentioning open-collector.

I have made one – just know that I am a total noob regarding electronics – you’ll probably laugh at my attempt: I want to use the N together with a 74LS to do memory address decoding.


You are aware that the 74LS’s outputs are active-low aren’t you? You are right – didn’t think about that combination: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Datqsheet yes, you’re right, forgot the ’06 was inverting. You should combine them with some sort of logic function eg ‘Or”And’ or similar.

N. Datasheet, PDF – Alldatasheet

Home Questions Tags Users Unanswered. Icy 2, 5 I’m a noob here. If both outputs are 1 5V wouldn’t they combined still be 5V?

Will that fry the N? Sign up using Facebook. So there won’t be a conflict if one output of the is high and the other is low. I had a feeling that this was the case. You should include a truth table. Is there a free web service where I can make that easily? Thanks for the correction.

Tying the two outputs together in this fashion is called a ” wired-or ” or ” wired-and datasjeet depending on the polarity of the signals the latter in this case, because the outputs of the ‘ are active low. Post as a guest Name. Woah – that’s neat! Sounds like what I need. That is, if one is high and the other is low.