ISO7820LL: About tsk(pp)

Ryoma Ohashi

Part Number: ISO7820LL

Hi team,

My customer is considering to use ISO7820LL and have a question about the tsk(pp).

In the datasheet, maximum value for tsk(pp) is 4.5ns.

If there is device A and B, there will be a worst cases that A is lagged ±4.5ns to B. So, from device A's point of view, the range of the lag/delay is 9.0ns, right?

If the speed of the communication is 100Mbps, it it 10ns for 1bit.

If the range of the lag is about 9.0ns, the margin for the skew or set/hold will be 1ns (10ns-9ns)

Is this correct?

I guess 1ns is too short for the margin. So, I would like to make it clear about tsk(pp).

Regards,

Ohashi

over 1 year ago

+1 Vikas Jeevannavar over 1 year ago

TI__Intellectual 2160 points

Hi Ohashi,

The worst-case scenario is not ±4.5ns but the max skew is 4.5ns, which means the max skew observed between any 2 devices is going to be 4.5ns given that the 2 devices are at same temperature and supply voltage.

Hope this resolves your query.

Thanks

Vikas J

0 Ryoma Ohashi over 1 year ago in reply to Vikas Jeevannavar

TI__Intellectual 2580 points

Hi Vikas,

Thanks for your reply.

So does it means that the margin is about like 5.5ns for 100Mbps? (10ns-4.5ns=5.5ns)

Regards,

Ohashi

0 Vikas Jeevannavar over 1 year ago in reply to Ryoma Ohashi

TI__Intellectual 2160 points

Hi Ohashi,

yes, that is correct.

Thanks

Vikas J

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ISO7820LL: About tsk(pp)