# Hello People I need some help with 2 bit comporator

Discussion in 'Homework Help' started by tetova, May 30, 2012.

1. ### tetova Thread Starter New Member

May 30, 2012
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0
Hi to everyone I would apperciave everyones help, I have an project in Fundamental of logic design, I've done all of it expect the EXPERIMENTAL BOARD with series number can anyone tell me how to do it ?

Best Regards.

2. ### tetova Thread Starter New Member

May 30, 2012
5
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any solution ?

3. ### crutschow Expert

Mar 14, 2008
13,491
3,372
Have no idea what the EXPERIMENTAL BOARD is.

4. ### tetova Thread Starter New Member

May 30, 2012
5
0
This is the one I did
Now I have to design it like this but I have no Idea how to do it, if you can do it for I would apperciate it very much couse its very urgently

5. ### MrChips Moderator

Oct 2, 2009
12,625
3,451
Just remember that no one is going to do your homework for you.
If you have a problem or a question maybe someone will try to help.

6. ### tetova Thread Starter New Member

May 30, 2012
5
0
Dear MrChips am not asking to do my homework am asking help for this thing .
If you can help I would apperciate couse this asnwer didn't help me at all :]

7. ### MrChips Moderator

Oct 2, 2009
12,625
3,451
Well then what is your question?

8. ### WBahn Moderator

Mar 31, 2012
18,086
4,917
Q1) What is the truth table for what you WANT to have happen?

Q2) What is the truth table for what IS happening?

Q3) Which of the three outputs is not behaving properly?

Mar 31, 2012
18,086
4,917

10. ### absf Senior Member

Dec 29, 2010
1,493
374
First you have to change U1 U2 and U3 to something easier for u to understand.

Let's assume the 3 inputs of U1 are A, B and C and the output is (A>B).

(A>B) = A' + B' +C' = (A.B.C)' So U1 & U2 are actually 3-input NAND gates.
Applying the same method, U3 is 2-input NOR gate.

Then you can google for TTL inverter, TTL 2-input NOR. TTL 2-input NAND and TTL 3-input NAND gates. Get the chip numbers and and their datasheets. Put the pin # onto your schematic as well as the part numbers. Then you can start connecting your Experiment Board...

HTH

Allen

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11. ### tetova Thread Starter New Member

May 30, 2012
5
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This helped me a lot thank you very much

And you others thanks for waisting my time

12. ### MrChips Moderator

Oct 2, 2009
12,625
3,451
You're very welcome. Please don't come again.