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Woah – that’s neat! Or, better yet, can you complete this truth table?: 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.

You can’t wire two outputs together like that. So there won’t be a conflict if one output of the is high and the other is low. I didn’t know about that concept and will read up on it. Post as a guest Name. 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.

Sign up or log in Sign up using Google. I have made one – just know that I am a total noob regarding electronics – you’ll probably laugh at my attempt: Since the 74LS has active low outputs, the Y0 and Y7 outputs will never both be low at the same time.


Thanks for mentioning open-collector.

Is there a free web service where I can make that easily? Following is the schematic from TI’s data sheet so dagasheet can see what’s going on in there, and what logic function dtaasheet you want to implement?

The has open-collector outputs. No that won’t work. Will switch to use the ‘ Icy 2, 5 Thanks for the correction. But I’m too lazy to edit, I’m just going to consider that last comment as over-completeness: Sign up using Email and Password.

I’m a noob here. You can use a instead of the You should combine them with some sort of logic function eg ‘Or”And’ or similar.

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

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I’m thinking that I can just use a ? I had a feeling that this was the case. Can you explain to me why it won’t work? I’m not doubting your answer – I just don’t understand why: I want to use the N together with a 74LS to do memory address decoding.

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That is, if one is high and the other is low. Home Questions Tags Users Unanswered. datasneet

7404 – 7404 Hex Inverter Datasheet

You are aware that the 74LS’s outputs are active-low aren’t you? What you are doing with the two outputs is not okay. Will that fry the N?

Thanks so much for the answer. Tying the two outputs together in this fashion is called a ” wired-or ” or ” wired-and ” depending on the polarity of 74004n signals the latter in this case, because the outputs of the ‘ are active low.

You should include a truth table. Sounds like what I need.

74LS04 NOT Gate IC | IC Datasheet

Tut yes, you’re right, forgot the ’06 was inverting. I will connect two Yx pins to two two dattasheet input pins on the N. 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.