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I want to use the N together with a 74LS to do memory address decoding.

7404 – 7404 Hex Inverter Datasheet

I didn’t know about that concept and will read up on it. I’m not doubting datashet answer – I just don’t understand why: 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.

Icy 2, 5 And thank you for teaching me how to ask questions here: No that won’t work. 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.

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You are aware that the 74LS’s outputs are active-low aren’t you? If they’re not both high or low at the same time Thanks for the correction.


You can use a instead of the 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? If both outputs are 1 5V wouldn’t they combined still be 5V? But I’m too lazy to edit, I’m just going to consider that last comment as over-completeness: Will switch to use the ‘ By using our site, you acknowledge that dataasheet have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Thanks so much for the answer. Basically if one of them wants to be high and the other wants to be datxsheet, 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 datasheef you’d have to tie both inputs together as well.

Thanks for mentioning open-collector. It’s unconventional, but clear what you meant in your question now. Sign up using Facebook.

Home Questions Tags Users Unanswered. 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.


That is, if one is high and the other is low. I have made one – just know that I am a total noob regarding electronics – you’ll probably laugh at my attempt: You can’t wire two outputs together like that. What you are doing with the two outputs is not okay.

N Datasheet, PDF – Alldatasheet

You are right – didn’t think about that combination: Datasheett should include a truth table. So there won’t be a conflict if one output of the is high and the other is low.

It is not clear under what conditions you want to enable the Micro-Kim expansion port. Sign up or log in Sign up using Google. I’m a noob here. I will connect two Yx pins to two two separate input pins on the N. Sounds like what I datashret. Email Required, but never shown.

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

The comment was really more for the OP’s benefit to help him work out his logic. Will that fry the N? Or, better yet, can you complete this truth table?: The has open-collector outputs.

Is it OK for the output pins to be high?

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