CDCLVC1108: Input slew rate

Part Number: CDCLVC1108

Hi,

Is it strictly mandatory to meet the input slew rate specified in the datasheet? I am planning to supply a clock from an oscillator, but I have been unable to find a device that meets the input slew rate requirements for the CDCLVC1108. If meeting the input slew rate is indeed required, could you please suggest a suitable device? 

Best regards,