How many transistors are there in this logic?

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user4592357

Joined Nov 13, 2016
20
For OAI32, in class we counted the number of transistors for gate level but now I'm counting it again and getting another result. In class we counted 8 for 3 input OR, 6 for 2 input OR, and 6 for NAND(?). Now I'm counting 8+6+4 (4 for NAND). 6 for NAND is wrong I think because even if we took an AND (which is 4+2=6) then inversed it, that would be 6+2=8, not 6. So which one is correct?
 

WBahn

Joined Mar 31, 2012
24,974
Assuming that we are talking standard CMOS logic, a NAND is 4 transistors.

The same functionality would commonly be implemented using NOR gates followed by an inverter yielding 16 transistors.
 
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