What Are the Noise Margins and Voltage Levels for CMOS Gates at 20 µA?

[orangeincup]

Homework Statement

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.

Homework Equations

i=v/R

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.

 

[Hesch]

accepted values seem to be V_IH min= 3.15V, V_IL min=1.35V.

Should be V_IL max = 1.35V

what am I suppose to use the current for?

You cannot see it your attached, but if you seach the full datasheet, you will see that V_IL and V_IH is guaranteed by a I_OH = 20μA and a I_OL = 4mA.

2) Both seem to be 0V
3) Completing the first two steps first, not sure how to do this yet.

Search the full datasheet.