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I had a feeling that this was the case. Email Required, but never shown. Thanks for mentioning open-collector. 7404b 2, 5 Sounds like what I need. You are aware that the 74LS’s outputs are active-low aren’t you? Sign up or log in Sign up using Google.

I will connect two Yx pins to two two separate input pins on the N. What you are doing with the two outputs is not okay. Sign up using Email and Password.

7404 – 7404 Hex Inverter Datasheet

The has open-collector outputs. I want to use the N together with a 74LS to do memory address decoding. So there won’t be a conflict if one output of the is high and the other is low. 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.


You can use a instead of the If both outputs are 1 5V wouldn’t they combined still be 5V? It is not clear under what conditions you want to enable the Micro-Kim expansion port. Is there a free web service where I can make that easily?

Can you explain to me why it won’t work? I didn’t know about that concept and will read up on it. 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.

Will switch to use the ‘ You can’t wire two outputs together like that. Thanks so much for the answer. Home Questions Tags Users Unanswered.

You should include a truth table. Tut yes, you’re right, forgot the ’06 was inverting.

Fatasheet they’re not both high or low at the same time I’m a noob here. I’m not doubting your answer – I just don’t understand why: Sign up using Facebook.

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

That is, if one is high and the other is low. It’s unconventional, but clear what you meant in your question now. 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. Since the 74LS has active datashet outputs, the Y0 and Y7 outputs will never both datashest low at the same time.


You should combine datashret with some sort of logic function eg ‘Or”And’ or similar. The comment was really more for the Ddatasheet benefit to help him work out his logic.

Woah – that’s neat! Will that fry the N? No that won’t work. 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: 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’m thinking that I can just use a ? Thanks for the correction.