> "All standardized common TTL circuits operate with a 5-volt power supply. 
> A TTL input signal is defined as "low" when between 0 V and 0.8 V with 
> respect to the ground terminal, and "high" when between 2.2 V and 5 V.[8]"
>
> And yet, note [8] refers to the link above, which contradicts that 
> statement. I'm confused...

I think they just took the average of the minimum output voltage and minimum 
input voltage (2.0 and 2.4) to simplify things.

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