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Will that fry the N?

If both outputs are 1 5V wouldn’t they combined still be 5V? 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. By clicking “Post Your Answer”, you acknowledge that you have read our datashfet terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. What you are doing with the two outputs is not okay.

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 4704n time, since then you’d have to tie both datashheet together as well.

It is not clear under what conditions you want to enable the Micro-Kim expansion port. Or, datasyeet yet, can you complete this truth table?: But I’m too lazy to edit, I’m just going to consider that last comment as over-completeness: Thanks for mentioning open-collector.


Thanks for the correction. Email Required, but never shown. Is there a free web service where I can make that easily? That is, if one is high and the other is low. The has open-collector outputs.

Is it OK for the output pins to be high?

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

Post as a guest Name. 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 datashret implement?

Sign up using Email and Password. Sign up using Facebook. Sounds like what I need. If they’re not both high or low at the same time I didn’t know about that concept and will read up on it. You should combine them with some sort of logic function eg ‘Or”And’ or similar. It’s unconventional, but clear what you meant in your question now. You are right – didn’t think about that combination: You should include a truth table.

I had a feeling that this was the case.

N, BG-ELECTRONICS NA,N, , Hex Inverter, Hex, Inverter

Thanks so much for the answer. You can’t wire two outputs together like that.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. You are aware that the 74LS’s outputs are active-low aren’t you? 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.

I have made one – just know that I am a total noob regarding electronics – you’ll probably laugh at my attempt: I’m thinking that I can just use a ? And thank you for teaching me how to ask questions here: No that won’t work.

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Since the 74LS has active low outputs, the Y0 and Y7 outputs will never both be low at the same time. Can you explain to me why it won’t work? Icy 2, dayasheet 740n Questions Tags Users Unanswered.

7404 – 7404 Hex Inverter Datasheet

You can use a instead of the Will switch to use the ‘ The comment was really more for the OP’s benefit to help him work out his logic. 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. Datashret – that’s neat! So there won’t be a conflict if one output of the is high and the other is low.

I don’t think it’ll fry anything, but since s aren’t open-collector gates, if you connect two outputs datasyeet and they’re not both high or low at the 4704n time, the output logic level will be undefined and can’t be guaranteed to be either a 1 or a zero.

Tut yes, you’re right, forgot the ’06 was inverting. Sign up or log in Sign up using Google. I’m a noob here.