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Step 1 of 3 8.021E The switch debouncing circuit is given below: Push SW SW_L DSW SW SW_L Step 2 of 3 Step 3 of 3 From the TTL and CMOS data sheets it is known that the above circuit should not be used with high-speed CMOS devices, like the 74ACT04, whose outputs are capable of sourcing large amounts of current in the HIGH state. While shorting such outputs to ground momentarily will not cause any damage, it will generate a noise pulse on power and ground signals that may trigger improper operation of the circuit elsewhere. The debouncing circuit in above figure works well with families like HCT and LS-TTL. Yes, the answer varies from slow logic family to fast logic family.