5V supplies for FS32K148UJT0VLQT RMII Interface?

[peter123]

I am having FS32K148UJT0VLQT on my design.  Most of my I/O interfaces are 5V, but RMII interface requires 3.3V.  I wonder if I can supply 5V to FS32K148UJT0VLQT and level-shift only the RMII interface signals down to 3.3V.  I assume with 5V supplies, the RMII signals will become 5V and I can simply level shift them to 3.3.  But I am not sure if the FS32K148UJT0VLQT RMII circuitry can handle 5V internally.  Not sure if this is a possible solution?  Thanks.

[peter123]

@Robin_Shen  Thanks so much.  NXP Tech Support team is impressive.  

[Robin_Shen · Accepted solution]

Hi

I think you can refer to the schematic of S32K148EVB-SCH-29644-RB, TXB0104 is used.

Best Regards,
Robin
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