I need to create a counter that counts down from 59 to zero. For that, i created a simulation in Proteus software where i used 4510 IC as a down counter and created the following circuit.
Now, i thought that, since this 4510 IC, when working in down counting mode, has output Co at logic zero whenever it reaches zero value, that means that when both of these two ICs have Co=0 then, i need to reset them to required value, which is in my case 59, otherwise it would start from 99 downwards.
It works fine when the circuit starts, because it actually starts at 59 and goes down all the way down to 10 and then, instead of going down to 9 it resets to 59, which is not what should've happened, since both Co's should be low when i have 00 combination at the output.
Does anyone have an idea what could be the problem here? Any help appreciated!