Making an UP/Down Counter MOD20 with 2x74191

Thread Starter

blank

Joined Apr 26, 2008
13
I would like to make an UP/DOWN Counter MOD20 with 2x74191

my thought is to make a MOD10 and a MOD2 so i can count to 20

but really i dont understand the inputs and the outputs of 74191 !!!

this is a preview of 74191:
 

beenthere

Joined Apr 20, 2004
15,808
If you just want to go 0 - 19, then a flip flop can do for the 10's digit.

Can you be specific about what you don't understand?
 
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