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CDCE706: Minimum Crystal Input

Part Number: CDCE706

Hello E2E,

I have a customer that passed along the following:

The CDCE706 PROGRAMMABLE 3-PLL CLOCK SYNTHESIZER has a minimum crystal input frequency of 8 MHz according to the datasheet.

 

Do you know why this is? 

We have implemented this device in our design using a 1 MHz crystal and it works fine allowing us to generate a clock output down to 15.4 Hz which is needed in our application.


Is there a reason why we should not operate the chip in this fashion even though it works fine?