How to design a 7400 having 4 single gates to place?
How can I design a 7400 (it has 4x NAND gates) so that I can place single NAND gates in the schematic editor?
What I've tried:
Using the parts/library editor I made a new component holding that 4 NAND. As the second step I wanted to assign the ICs pins (14). Assigning the pins to the 4 NANDs wasnt a problem but it wasnt possible to assign pin7 to GND and pin14 as Vcc because these pins havent been in the assignment list/editor. What did I wrong?
Thanks for your help
CommentsAdd a comment
February 27, 2018 08:41
Thanks for the hint ! I did that and it works fine.
February 12, 2018 08:48
Hi Peter, not quite sure what went wrong, but you can define the 7400 as 4 or 5 gates.
If the 4 gates option which looks neater in my view you define a schematic symbol for 2i/ps and 1 o/p and use this 3 times. The fourth gate has the two power pins as well.
If you enable the installed legacy libraries (mainly through hole parts) there is a 74LS family which illustrates multi gates, but they were created using pwr to each gate i.e. 5 pins per NAND function which is a bit messy in my view.