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Clocks & Timers
Clocks & Timers Forum
Termination of unused clock output pins & using single ended clock output Reg
We are using CDCM7005RGZT in our boards.We want to know the following for designing with this part.
1.The CDCM 7005 clock output pins (Y0A,Y0B....Y4A,Y4B) if a pair is unused can i laeve this pins in floating state? or i have to terminate it.If so what is the recommended termination scheme? As our board is having tight space constraints we prefer leaving the unused clock output pins in NC floating state. Kindly tell us will there be any performance degradation due to this?
2.When only single ended clock output is taken from the CDCM7005.Then,is it possible for clock output YxB(negative) pins to be kept open(floating,without any termination)? Or is there a way to program the CDCM to output only single ended clock .
Kindly tell us suitable solution for this at the earliest possible.
Thanks & Regards,
thanks for your interest in our device.
1. Yes, you can leave the other outputs in a floating state and set them to tri-state
2. Yes you can select one of the LVCMOS to tri-state and keep it floating while the other is active. Please refer to the table below to define the register setting accordingly.
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