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 i=v/R 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.