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SN74LVC1G97-Q1: SN74LVC1G97QDCKRQ1 prop delay

Aaron Spaete
Expert 4411 points
Part Number: SN74LVC1G97-Q1

Team, 

My customer has the following question:  

I have a question regarding the propagation delay specification for the Texas Instruments P/N SN74LVC1G97QDCKRQ1 configurable logic gate.  The propagation delay is specified to be 1.5ns to 6.3ns.  Is this wide range due to process variation or is it a function of voltage and temperature extremes?  I am wondering what the worst case variation in propagation delay would be across multiple devices given all devices would be exposed to the same temperature and supply voltage conditions.  In other words, would the propagation delay track more closely than the specification from part to part if all devices transition from an operating temperature of -40C to +70C at the same time?

Regards,

Aaron

  • 0
    TI__Expert 6680 points

    Hi Aaron,

    Aaron Spaete said:
    Is this wide range due to process variation or is it a function of voltage and temperature extremes?

    This is actually because both of the reasons above. We sample multiple wafer lots and vary them over temperature and voltage to come up with these guarantees in the datasheet. 

    Aaron Spaete said:
    In other words, would the propagation delay track more closely than the specification from part to part if all devices transition from an operating temperature of -40C to +70C at the same time?

    If I understand your question correctly, yes, these devices' tpd values would increase and/or decrease by a similar delta if the temperature is varied equally across them.

    Thanks!

    Chad Crosby

  • 0 in reply to Chad Crosby
    Prodigy 10 points

    Chad,

    Can you provide a worst case tolerance for part to part variation for propagation delay at 3.3V with temperature and voltage tracking for all parts at the same time?  In other words, what relative variation in propagation delay from part to part would be seen as the devices pass from -40C to +85C.

    Regards,

    Dave Wilberg

    Electrical Engineer, Collins Aerospace

  • 0 in reply to 6581391
    TI__Expert 6680 points

    Hi Dave,

    I'll see if I can gather more information on this and get back to you.

    Thanks!

    Chad Crosby

  • 0 in reply to 6581391
    TI__Expert 6680 points

    Hi Dave,

    I wasn't able to find any data across temperature, I'm still waiting for some of my team to get back to me.

    I was able to find device-to-device variation @ VCC = 3.3V, TA = 25C:

    Across 270 devices, we measured TPLH (Propagation delay, Low to High transition) on IN0 to Y, averaged about 3.66ns, with a min of 3.23ns and a max at 4.18ns

    Hope the above helps, I'll update this thread once I hear back from our test team.

    Thanks!

    Chad Crosby