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SN74AHC244: Missing IBIS models

Expert 1025 points

Part Number: SN74AHC244

Why are there no 2.5V IBIS models for the SN74AHC244
AND
for the SN74LV175 parts???
I can use the 3.3V model, but this doesn't really reflect the output levels and the drive into 2.5V parts that may receive the signal. I would like to make sure any ringing on the output edges doesn't happen at the thresholds.
Neither part has an INPUT or OUTPUT model at 2.5V