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I don’t think it’ll fry anything, but since s aren’t open-collector gates, if you dayasheet 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. The comment was really more for the OP’s benefit to help him work out his logic. 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: Is there a free web service where I can make that easily?
Will switch to use the ‘ Sign up or log in Sign up using Google. Will that fry the N?
7404 – 7404 Hex Inverter Datasheet
I want to use the N together with a 74LS to do memory address decoding. You should include a truth table. Thanks so much for the answer. It is not clear under what conditions you want to enable the Micro-Kim expansion port.
digital logic – N and high output – Electrical Engineering Stack Exchange
You can use a instead of the Or, better yet, can you complete this truth table?: And thank you for teaching me how to ask questions here: Sign up using Facebook. 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.
Sign up using Email and Password. I’m thinking that I can just use a ? I had a feeling that this was the case.
N. Datasheet, PDF – Alldatasheet
Thanks for the correction. Icy 2, 5 I’m not doubting your answer – I just don’t understand why: The has open-collector outputs. If they’re not both high or low at the same time Is it OK for the output pins to be high? Can you explain to me why it won’t work?
Sounds like what I need. 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. You should combine them with some sort of logic function eg ‘Or”And’ or similar.
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 didn’t know about that concept and will read up on it. Thanks for mentioning open-collector. Home Questions Tags Users Unanswered.
I’m a noob here. 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? Woah – that’s neat! You can’t wire two outputs together like that. Email Required, but never shown. That is, if one is high and the other is low.
You are right – didn’t think about that combination: Post as a guest Name. Since the 74LS has active low outputs, the Y0 and Y7 outputs will never both be low at the same time. Tut yes, you’re right, forgot the ’06 was inverting. I have made one – just know that I am a total noob regarding electronics – you’ll probably laugh at my attempt: