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AVCMOS output are useful in Telecom applications where hot swapping is involved. When a card is pulled hot the device senses the load difference in multiple loads that are driven across the backplane and responds in real time.
Another use is in some devices that change load when they are active to power down. These are mainly large ASICs where drawing (sinking) some current to almost isolation can cause other ICs issues if they are sharing the same clock line.