He told me to show the block diagram of the decoder 3-8(IC74138). What is block diagram and how to draw 1 btw.

 

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A block diagram shows the functional blocks of a circuit without going into the circuit details. They are often found in the datasheets for a part. Do you know how to find the datasheet for a part?

 

Here is an example of a block diagram:

 

he asked you to build equivalent of that IC using only basic gates (AND, OR, NOT)