ADR421 VIN Range

Hi, 

For the ADR421 device, what is the minimum voltage for the VIN input? 

In our design, we are planning to use it for the  VIN=5V and VOUT=2.5V.

However, our input voltage may degrade and becomes between the 4.75V and 4.925V. For the voltage VIN=4.85V, does output voltage also degrade? What will be the output voltage for such a case? Does the output voltage stay in range [2.475V, 2.525V] ? 

Thanks in advance.