I am trying to create a digital counter in Multisim9. I have two 74LS47 + 74LS160 schemes connected to a pair of 7-segment display. My counter is counting from 00 to 99 and continues without stopping.
My questions are: how do I make it stop after it reaches 99 and how do I make it count backwards?
I am trying to create a digital counter in Multisim9. I have two 74LS47 + 74LS160 schemes connected to a pair of 7-segment display. My counter is counting from 00 to 99 and continues without stopping.
My questions are: how do I make it stop after it reaches 99 and how do I make it count backwards?
Well the quick answer is maybe it is an eval and they only gave you LS parts and only a few of those, try 74LS193.
The other possibility is to pick up a spring board from Radio Shack and just wire one together.
You need to look for a BCD up/down counter for what you are trying to do. 74190,192,193,40192,40110 are all candidates. The letters in front, middle and end of these numbers are manufacturer, family and package designations.