AND and NAND gate don't work well when used with 74LS193N

When I use AND or NAND to work with 74LS193N, that it has not produced the result that I expected. Please see my download folder. I use AND and NAND gate to switch my FF JK when my 74LS193N give a 1001 signal but my FF JK switch before that when my 74LS193N produce a 1000 signal then it then it switches again when the 47LS193N product 1001. According to my observation he just to produce the signal in a very short time, this signal is able to pass through the NAND and AND farm at triggle my JK FF. I know this sholdn can't be happen. I thought that the signal that I spend when both inputs are high, I tried and NAND with any other logic gates so far its fine, so I don't have this problem hope someone can help me. For this reason all my work unable to design, it bothers me a lot...  Help!

I guess I'm confused as to why you would use a generic part instead of parts 74LS00/08.  What you see are the differences in sync settings.   If you double-click on the door AND generic and press to edit the template, you will see the rise and fall of delay is 1nS.  If you place a 74LS08D and do the same thing, the delay of climb is 15nS and fall time is 20nS.   More likely, there is a setting of high spice for the counter where the QD line passes for a very small amount of time while the QA, QB, and lines QC transition from high to low.  The real AND doors NAND can't see this transition delays inherent in the real part spread (rise and fall).  If you change the values of the generic parts to that of the actual element values, the circuit should work.

Tags: NI Software

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