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ISO3088: Maximum Receiver output rise and fall time

Part Number: ISO3088

Hi,

Could anyone share the maximum value of rise and fall time of receiver output pin R of ISO3088.

In datasheet only typical value of 1ns  is showing.

While checking the signal timing of  ISO3088 transceiver, I got a rise and fall time of 1.16ns and 1.09ns respectively. I need the maximum value data  for to cross verify the results.

Kindly reply.

Warm regards,

Monisha OM

  • Hi Monisha,

    Thank you for your interest in ISO3088.
    Please note that the output rise and fall time values depend on external components, especially the load capacitance CL. Since this value largely depends on the external components used and their characteristics, we wouldn't be able to quote a min/max value. Instead a typical value is quoted for a given load capacitance of 15pF. The min/max value for this 15pF capacitor depends largely on the capacitor's characteristics (against voltage, temperature, etc).

    Let me know if there is anything else I can help you with, thanks.

    Regards,
    Koteshwar Rao

  • Thank you for quick response.

    I want to know the rise and fall time maximum value for to validate the DVT. Then only I know the observed value (tr=1.16ns and tf= 1.09ns)is pass or fail. 

    Kindly consider my situation and let me know the maximum rise and fall time for worst case.

    Also as you said The typical quoted for given Load capacitance of 15pF. May I know  how much maximum value will considered for that case?

    Warm regards,

    Monisha OM

  • Hi Monisha,

    I understand your situation. If I understand it right, I believe you want to know the max value so that you can determine if the device is good and working as per the expectation.

    1ns is fairly a very small rise time for a 20Mbps device and hence, I wouldn't hesitate in keeping a larger acceptable max value as a limit to determine if the device is working or not. I would say even a 2.5ns rise/fall time is also pretty fast, so feel free to use this number as your max limit.

    Meanwhile, I will still try to check if I can get this number from the design team. Thanks.

    Regards,
    Koteshwar Rao

  • Hi Monisha,

    I have discussed with the design regarding the max rise/fall time spec for the receiver output. The team's feedback is that it is best to use 5ns as the max / worst-case value for the rise/fall time of the receiver output for the given test conditions in datasheet. I hope this answers your question, thanks.

    Regards,
    Koteshwar Rao