[SI-LIST] measuring DC elec. chs

Hi,
I'm into chracterizing i/o cells. I want to know how to measure DC specs like 
Vih,Vil,Voh,Vol. 
Suppose, I f I know worst case Ioh or Iol then, can I load the o/p of the cell 
with that current, and
see how much is the voltage available at that load and treat it as Voh/Vol. 
But as per Jan Rabaey book (dig. Int. circuits) I could see, its proposed to 
use the DC trans. curves 
and the voltage corresponding to unity slope in curve is assumed to be Voh/l. 
Could anyone clarify on this.
Regards,
Canes




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