September 2006

PCS5I9773

rev 0. 4

2.5V or 3.3V, 200 MHz, 12-Output Zero Delay Buffer

10 of 16

Notice: The information in this document is subject to change without notice.

SYNC Output

In situations where output frequency relationships are not

integer multiples of each other the SYNC output provides

a signal for system synchronization. The PCS5I9773

monitors the relationship between the QA and the QC

output clocks. It provides a low going pulse, one period in

duration, one period prior to the coincident rising edges of

the QA and QC outputs. The duration and the placement

of the pulse depend on the higher of the QA and QC

output frequencies. The following timing diagram

illustrates various waveforms for the SYNC output. Note

that the SYNC output is defined for all possible

combinations of the QA and QC outputs even though

under some relationships the lower frequency clock could

be used as a synchronizing signal.