Since the 4040 is Async, wont this method risk false triggering as the
ripple goes through the stages?

> You could do it with a 4040 and a 4-input AND gate. Take the logic
> outputs for hA3 = %10100011 (a0,a1,a5,a7) and AND them together,
> with the output going to the 4040's reset to clear the 4040 back to
> all zero outputs. A pulse will be produced each time a0&a1&a5&a7
>
> I use this method to do long division in h/w when counting mains
> cycles but you may find that the 4040 @ 5V won't take 12.5MHz.
> The 74HC4040 probably would, and any TTL binary counter will

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