Question 312

In Figure E6-3, which is the schematic symbol for a NOR gate?

Six schematic symbols of digital logic elements, numbered 1 through 6.

1
2
3
4Correct answer

Explanation

Symbol 4 has the concave input side and pointed output of an OR gate plus an inversion bubble, which makes it a NOR. Symbol 3 is that same OR body without the bubble, symbol 1 is a plain AND, and symbol 2 is the AND body with a bubble, which is a NAND.

Explanation

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