THVD1450: Change in supply from 5V to 3.3V

Part Number:THVD1450

Hi Team,

Our customer design THVD1450 initially with 5Vcc and currently changed the supply to 3.3Vcc. Can this supply change from 5Vcc to 3.3Vcc create any impact on lines A (5^th pin) and B(6^th pin). Is there any variation on voltage levels. If there is any issue, please suggest the logic shift IC between RS485 device and micro controller device. Need your suggestion on pin6,7 series resistor values and pin6 pull-up resistor to Vcc.

Regards, Shinu Mathew.