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A CMOS IC operating from a 3-volt supply will consume ________.

  • A.less power than a TTL IC
  • B.more power than a TTL IC
  • C.the same power as a TTL 
  • D.no power at all

Answer: A

Correct answer: less power than a TTL IC

CMOS draws significant current only while switching, so its static dissipation is minute compared with TTL, which draws current continuously through its output stage. Lowering the supply to 3 V reduces it further still, since dynamic power varies with the square of the supply voltage.

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