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I didn’t know about that concept and will read up on it. 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.

Since the 74LS has active low outputs, the Y0 and Y7 outputs will never both be low at the same time. I’m not doubting your answer – I just don’t understand why: Sign up or log in Sign up using Google.

Woah – that’s neat! Is there a free web service where I can make that easily?

Thanks so much for the answer. Icy 2, 5 You should combine them with some sort of logic function eg ‘Or”And’ or similar. 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 7440n low at the same time, the output logic level will be undefined 7044n can’t be guaranteed to be either a 1 or a zero.


The comment was really more for the OP’s benefit to help him work out his logic. I’m thinking that I can just use a ? By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policydztasheet that your continued use of the website is subject to these policies.

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N Datasheet, PDF – Alldatasheet

Tying the two outputs together in this fashion is called a ” wired-or ” or ” wired-and ” depending on the polarity of the signals the latter in this case, because the outputs of the ‘ are active low. If they’re not both high or low at the same time I want to use the N together with a 74LS to do memory address decoding. It is not clear under what conditions you want to enable the Micro-Kim expansion port.

No that won’t work. What you are doing with the two outputs is not okay. So there won’t be a conflict if one output of the is high and the other is low. Email Required, but never shown. That is, if one is high and the other is low. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. And thank you for teaching me how to datassheet questions here: 77404n I’m too lazy to edit, I’m just going to consider that last comment as over-completeness: It’s unconventional, but clear what you meant in your question now.

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I had a feeling that this was the case. Is it OK for the output pins to be high?

7404 – 7404 Hex Inverter Datasheet

Or, better yet, can you complete this truth table?: I’m a noob here. You are right – didn’t think about that combination: 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?

The has open-collector outputs. Thanks for the correction. If both outputs are 1 5V wouldn’t they combined still be 5V? You should include a truth table.

Will switch to use the ‘ Sounds like what I need. I will connect two Yx pins to two two separate input pins dataseet the N. Home Questions Tags Users Unanswered.