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ISO7240MDW - 100Mbps Speed Whether Possible

ARM arm
Expert 2630 points
Other Parts Discussed in Thread: ISO7840

Hi,

I want to use Digital Isolator circuits to isolate lines including clock @ 40MHz i.e. bit rate on clock line is 80Mbps.

My Vcc1 = 3.3V and Vcc2 = 5V.

In such case, when I see the specs I get a doubt:- tPLH, tPHL Propagation delay and min and max value = 12ns and 34 ns then how can a signalling rate 100Mbps / 150 Mbps can be achieved through these digital isolators?

A quick reply as to where I am confused will be highly appreciable.

Thanks and Regards.

  • 0
    TI__Guru 55795 points

    Hi,

    Even if the propagation delays (tPLH, tPHL) are higher than bit width (1/datarate), data transmission should not be impacted. Input can change even before the previous input propagates to output provided datarate limits are not violated. This is similar to a pipeline architecture where the processor can take additional tasks while still processing earlier tasks.

    For better prop delays, please use ISO7840.

    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Expert 2630 points
    Thanks I actually realized that I have raised a basic doubt... but thanks for confirmation...

    Regards..