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When designing a digital one-minute counting circuit I came across a difficult problem. 

Basically, I designed the circuit to drive the (normally HIGH) clock of the 10s slot low if the 1s slot's current state was 9 (actually, just if the first and last bits are HIGH -> 1001)

The devices I am using are positive edge, so when the 1s slot returns to zero the condition is no longer satisfied - therefore the clock returns to a HIGH state and increments the 10s slot.

The problem is that I was getting double clock problems(7->8 transition and the designed clock mechanism).   

It turns out that there was just enough delay in the switching between 7 -> 8 (0111 -> 1000) that the first/last bit HIGH condition is satisfied:

i.e., some combination occurs in the transition period to register a logical HIGH at the output

1001 1011 1101 1111

The temporary solution to the problem I came up with was to actually keep the clock for the 10s slot LOW until the condition where the 1s slot equals 0 (0000) is satisfied(So, essentially clock WHEN we get to the state as opposed to before). However, this solution requires too many gates (a 4-input NOR minimum). My previous design was actually fed from another part in the design that is already present, so it didn't require any additional circuitry. 

Any ideas on a more efficient solution?  




The IC's used in this design are the 74LS47 (7Segment decoder) and the 74LS163 (4-bit binary counter). The pull-down resistor inclusion is a mechanism to set the counters to 00 and hold while the switch is closed. 
