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LM51770: SYNC

Part Number: LM51770

Tool/software:

Hi,

About using the LM51770 circuit there's a question.
If the SYNC pin I provide a valid frequency from other ic.
I see the data sheet there's mentioned If a signal within the recommended range on the SYNC pin is applied, the device does not enter uSleep mode.
Is there any side effect when I applied SYNC a valid frequency from other ic and the selected to PSM?