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XIO2001: /PEREST and REFCLK during power down sequence

Oba
Genius 17325 points
Part Number: XIO2001

Hello,

XIO2001 datasheet(SCPS212I) requires asserting /PERST before removing REFCLK for power down sequence in P23.
But my customer would like to know what kind of problem could happen if removing REFCLK before asserting /PERST because of their system design easiness.
Does the user absolutely have to keep this order in the datasheet?

Regards,
Oba