How to count the amount of pins that a particular circuit uses

StackOverflow https://stackoverflow.com/questions/21119636

  •  28-09-2022
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Question

For a circuit like this:

enter image description here

How do you decide how many pins would be needed? Listening back to the lecture someone declared it as 19, but I don't know where that value has came from. Could someone explain or the label the diagram for how we get 19 ?

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Solution

19 pins = 9 inputs + 8 outputs + 1 power + 1 ground

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