LTC3417 external clock and internal clock


In LTC3417,

External clock have below discription in datasheet.

When external frequency equal internal one.

LTC3417 output is unstable .

When External frequency up to +20% from internal frequency,

IC output is stable.

What operation is occured in IC?

How much %  can we use for RT?(Do external frequency +40% ,+60% from internal them have correct operation?)

Because  RT resistor have some dispersion.

Best regards 

Thank you very much

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