Since the 138 does the decoding to 1-of-n, why do you need the three flipflops?

Is it a requirement that all parts be TTL?

ak

 

Since the 138 does the decoding to 1-of-n, why do you need the three flipflops?
ak

He’s using the flipflops as a latch.

 

Since the 138 does the decoding to 1-of-n, why do you need the three flipflops?

Is it a requirement that all parts be TTL?

ak

So that the led stays on and no its not a requirement to have everything ttl. Most of the stuff we covered this semester was ttl though. My version of multisim doesn't have all the chips either. This has been an issue in itself.

 

Finished