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TPS40422: External SYNC

Guru 29690 points
Part Number: TPS40422

Hi Team,

The datasheet shows "internal oscillator is synchronized to external clock when an external clock is applied to SYNC pin".
Is it possible to tell me the mechanism how to be synchronized?
My customer wants to know it, but if it is difficult to disclose please kindly let me know.

Best Regards,
Yaita / Japan disty