6953 ezs_srq skew, part to part

Hello, LTC6953 datasheet, sheet 5 in EZS_SRQ Timing Specifications shows EZS_SRQ, Part to Part is 10µs.  Would you please specify what this parameter implies?

We have internal disagreement whether or not the sysrefs out of the first stage 6953 on multiple boards can achieve better than 10us skew.

Thanks,

Nick

Parents
  • +1
    •  Analog Employees 
    on Feb 16, 2021 6:19 PM

    The specification that you are referring to is an input timing requirement for EZSync to work properly. It has nothing to do with output skew which will be very small an dis covered in the output timing skew specifications. What the 10us refers to is that when you have multiple LTC6953 parts connected in cascade as in figure 6 on page 19, the sync pulse can arrive at all of the parts with a skew as large as 10us and EZSync will still function as expected. This is a very forgiving input timing requirement to allow for large trace length mismatching in distributing the SYNC signal to all parts. In most applications this skew is a few ns but EZSync was designed to allow large systems with boards in different chassis to still be synchronized without the need to provide a super well aligned sync signal.

Reply
  • +1
    •  Analog Employees 
    on Feb 16, 2021 6:19 PM

    The specification that you are referring to is an input timing requirement for EZSync to work properly. It has nothing to do with output skew which will be very small an dis covered in the output timing skew specifications. What the 10us refers to is that when you have multiple LTC6953 parts connected in cascade as in figure 6 on page 19, the sync pulse can arrive at all of the parts with a skew as large as 10us and EZSync will still function as expected. This is a very forgiving input timing requirement to allow for large trace length mismatching in distributing the SYNC signal to all parts. In most applications this skew is a few ns but EZSync was designed to allow large systems with boards in different chassis to still be synchronized without the need to provide a super well aligned sync signal.

Children