Assuming the same cost for each, why should you choose to use a 74ALS193 counter over a 74LS193 or a…

1. Assuming the same cost for each, why should you choose to use a 74ALS193 counter over a 74LS193 or a 74AS193 in a circuit operating from a 40-MHz clock?

2. Describe the difference between current sinking and current sourcing.

3. What are two acceptable ways to handle unused inputs to an NOR gate?

 

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