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NVT4858HK - Output to Output and Part to Part Skew for VCCA=1.8V and VCCB=1.8V. Also use for QSPI

Hi,

As shown in below image from below linked NVT4848 datasheet, the output to output skew for the NVT4858HK is specified at 200ps max with VCCA=1.2V and VCCB = 3.3V OR 1.8V.

I would like to confirm:

The output to output skew for all outputs on a single NVT4858HK IC with both VCCA and VCCB operating at the same 1.8V supply voltage
The part to part skew for two separate NVT4858HK IC's both operating with VCCA and VCCB operating at the same 1.8V supply voltage (can assume both parts are within same temperature, say within 5C or so)

Can NXP please provide this info?

I have application where want to use these parts for redriving long traces for eMMC which is 8 bit wide data bus so requires two NVT4858HK parts.

Also considering using as a QSPI redriver for long traces, but want to confirm the skew. Does NXP see any issue using this part for QSPI?

https://www.nxp.com/docs/en/data-sheet/NVT4858.pdf

Thanks!

Level Shifters

Re: NVT4858HK - Output to Output and Part to Part Skew for VCCA=1.8V and VCCB=1.8V. Also use for QSP

Sorry but I'm not following.

Table 13 from datasheet that I posted in original question provides the output to output skew of the NVT4858HK right? It's 200ps max for clk/cmd to data and 200ps max for data to data? So you do have output to output skew or am I misunderstanding that table? Then I am asking for the skew for case where VCCA=1.8V and VCCB=1.8V.

For part to part skew, in below linked forum post when asked if there would be any timing issue with splitting signals for an SD card interface across two separate NVT4858 parts, you had stated that should not be an issue. This means there must be some known timing relationship between the two parts, right? How can the answer to that post be no issue if there is no info about timing between two NVT4858 parts?

https://community.nxp.com/t5/Digital-Signal-Controllers/two-NVT4858-use-question/m-p/1484273

And in this forum post, user shows schematic with an eMMC interface split across multiple NVT4858 parts. How can it be known this would work to meet eMMC timing requirements without knowing skew between the parts?

https://community.nxp.com/t5/High-Performance-Analog-Front/CLK-CMD-and-DATA-pins-unconnected-when-th...

Re: NVT4858HK - Output to Output and Part to Part Skew for VCCA=1.8V and VCCB=1.8V. Also use for QSP

HI Steve

Unfortunately we don't have others about the output to output and part to part skew for NVT4848 except datasheet's parameters.

But it can be used in QSPI communication and without any issue.

Thanks!

Re: NVT4858HK - Output to Output and Part to Part Skew for VCCA=1.8V and VCCB=1.8V. Also use for QSP

Alright then.

One additional question, can you confirm the NVT4858HK is suitable for 8 bit eMMC level translation?