74LS193 4Bit Binary Up/Down Counter

[ebonybeaver]

I am having difficulty making the 74LS193 automatically count up and then recycle and count back down. That is 0000 - 1111-0000. I wired the circuit to make it count up. I had to switch the wires of the clock and the high between pins 4 and 5 to make it count down. Could you please let me know what way to wire it to automatically count up and then recycle back down. I need to know what pins to put together. I read your post about cascading them together. However I didn't really understand what you meant. I didn't know what to do with the inputs or whether to take the outputs into the inputs of the next chip. Please help me understand. Thanks in Advance

 

[nettron1000]

I built a circuit awhile ago similar to what you are discribing. You have to use the carry and borrow output pins (12/13) connected to a gated flip-flop for up/down sequecial counting.
Heres a link to a scanned copy of my circuit with a breif disciption;

http://www.geocities.com/nettron1000/SEQLEDFLASHER1.html