All Questions
4
questions
2
votes
2
answers
2k
views
What is the True Pinout and Function of the 74ls181 in both of its modes (Active High and Active Low)?
I've found several datasheets for the 74ls181 with pinout and function diagrams as pictured below.
This from Jameco (where I bought mine): https://www.jameco.com/Jameco/Products/ProdDS/46973.pdf
...
- 470
0
votes
1
answer
919
views
Why is the output to this 74181 ALU circuit always on?
I recently built an ALU circuit using the 74181 4 bit ALU. The circuit I built is below:
simulate this circuit – Schematic created using CircuitLab
Please note that the pinout in the ...
- 807
2
votes
4
answers
3k
views
74181 ALU not working properly cascaded to add 8 bit numbers
I'm trying to make a homebrew CPU but having problems with the 74LS181 ALU, which I'm simulating in Logisim software before diving into real ICs and breadboards.
I've cascaded two 74181 following ...
- 171
0
votes
1
answer
1k
views
How does this reverse NOT gate work?
I created a 74LS181 circuit in Logisim based on TI's datasheet. Notice how the NOT gate for the B0 input has a dot before the triangle:
Here's a screenshot of my circuit:
Notice that my inversion ...
- 675