The DS250DF230 offers a CDR Fast Lock Mode option to enable a CDR lock time as fast as 2 ms. See CDR lock time parameter in Electrical Characteristics.

Normally, CDR acquisition lock time is gated by multiple factors, most notably until a minimum horizontal and vertical eye opening (HEO/VEO) is observed at the receiver, causing typical CDR lock times of up to 100 ms. In CDR Fast Lock Mode, the DS250DF230 outputs retimed data as soon as CDR lock is achieved based on PPM tolerance and VCO input comparator voltage requirements, removing minimum HEO/VEO requirements. This results in active retimed output data within 10 ms or less. Meanwhile, the EQ adaptation continues to run in the background and adjusts CTLE and DFE settings until optimal. As a result, when in CDR Fast Lock Mode, there may be bit errors observed in the retimed data output until EQ adaptation completes.