LSF0101: 1.2 V ↔ 1.8

Hi Team,

I have a question regarding LSF0101DRYR

In datasheet front page is indicated that Va<-->Vb 1.2V<-->1.8V  is a  possible config:

Allows bidirectional voltage-level translation between

– 0.95 V ↔ 1.8/2.5/3.3/5 V

– 1.2 V ↔ 1.8/2.5/3.3/5 V

– 1.8 V ↔ 2.5/3.3/5 V

– 2.5 V ↔ 3.3/5 V

– 3.3 V ↔ 5 V

But on page 13 is indicated:

Also Vref_B and VI(EN) are recommended to be 1.0 V higher than Vref_A for best signal integrity.

Our customer wants to use this device in the following conditions:

              FPGA VB 1.8V +/-5%   

              PHY  VA 1.2V +/-5%

              Freq. MDIO CLK 10MHz 

In this case Vb is not > 1V compared to VA

 Therefore:

1. In the condition indicated above, with Fclk_mdio = 10MHz is guaranteed the operation?
2. In case it is not working properly, could you indicate another device to translate 1.2V<-->1.8V?

Regards,

F.