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Homework Help: Characteristics of CMOS gate

  1. Oct 3, 2015 #1
    1. The problem statement, all variables and given/known data
    1)Determine the min acceptable values for VIH and VOH using VCC = 4.5 V and output current of 20 µA.

    2)Determine the maximum acceptable values for VOL and VIL under the same test conditions.

    3)Compute the noise margins.

    2. Relevant equations
    3. The attempt at a solution
    I'm not 100% sure how to read the figure, but the min accepted values seem to be VIH min= 3.15V, VIL min=1.35V.

    My question is, what am I suppose to use the current for? I don't really see where to implement it.

    2) Both seem to be 0V

    3) Completing the first two steps first, not sure how to do this yet.

    Attached Files:

  2. jcsd
  3. Oct 4, 2015 #2


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    Gold Member

    Should be VIL max = 1.35V
    You cannot see it your attached, but if you seach the full datasheet, you will see that VIL and VIH is guaranteed by a IOH = 20μA and a IOL = 4mA.
    Search the full datasheet.
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