Total noob here.
The tech sheet can be found here: http://www.ti.com/lit/ds/symlink/sn74as138.pdf
In the VOH parameter for the SN74AS138 on page 5, it states that it's MIN is VCC-2.
What does that mean? What is referring to? Is it referring to the actual VCC minus 2 volts? So 2.5V for VCC = 4.5V?
Here's the snippet I'm talking about: