When Vcca=1.8V what is Vt- for inputs referenced to vcca ? The datasheet only specifies Vt- at 1.65V and 2.3V.
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When Vcca=1.8V what is Vt- for inputs referenced to vcca ? The datasheet only specifies Vt- at 1.65V and 2.3V.
1.65 V is the worst case of a 1.8 V ± 0.15 V supply; you are supposed to use this value.
If you can guarantee that your supply has much tighter tolerances, use linear interpolation; see [FAQ] What method is best used for estimating specification values between those given in the datasheet?