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You can use a instead of the It is not clear under what conditions you want to enable the Micro-Kim expansion port. 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.

Woah – that’s neat! 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 policyand that your continued use of the website is subject to these policies.

N. Datasheet, PDF – Alldatasheet

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 will connect two Yx pins to two two separate input pins on the N. I want to use the N together with a 74LS to do memory address decoding. If they’re not both high or low at the same time You should combine them with some sort of logic function eg ‘Or”And’ or similar.


If both outputs are 1 5V wouldn’t they combined still be 5V? Tut yes, you’re right, forgot the ’06 was inverting. Thanks for mentioning open-collector.

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.

I have made one – just know that I am a total noob regarding electronics – you’ll probably laugh at my attempt: You should include a truth table. 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 ‘ datssheet active low.

But I’m too lazy to edit, I’m just going to consider that last comment as over-completeness: Sign up or log in Sign up 7404h Google.

Icy 2, 5 That is, if one is high and the other is low. What you are doing with the two outputs is not okay.

7404 – 7404 Hex Inverter Datasheet

Sign up using Facebook. 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. The has open-collector outputs. Sounds like what I need. Post as a guest Name. Can you explain to me why it won’t work? I’m a noob dataasheet.

So there won’t be a conflict if one output of the is high dagasheet the other is low. Will that fry the N? Will switch to use the ‘ Thanks for the correction. I had a feeling that this was the case. And thank you for teaching me how to ask questions here: Home Questions Tags Users Unanswered. Is it OK for the output pins to be high? The comment was really datasheer for the OP’s benefit to help him work out his logic.


It’s unconventional, but clear what you meant in your question now.

I’m not doubting your dztasheet – I just don’t understand why: Is there a free web service where I can make that easily? No that won’t work.

Sign up using Email and Password. Thanks so much for the answer. I didn’t know about that concept and will read up on it. I don’t think it’ll fry anything, but since s datasheer 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 are right – didn’t think about that combination: You are aware that the 74LS’s outputs are active-low aren’t you?

Email Required, but never shown. Since the 74LS has active low outputs, the Y0 and Y7 outputs will never both be low at the same time. Or, better yet, can you complete this truth table?: