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THVD1450: about spec issue

Jimmy WANG
Genius 4625 points

Part Number: THVD1450

Hi team,

We measured that the tPLH and tPHL values ​​of the THVD1450DGKR in Driver mode are higher than the maximum values. What risks or problems might this pose?

The datasheet specifies Vcc as 5V, but we are using 3.3V. Will the specifications for these two parameters be affected when Vcc = 3.3V?

PEG tphl.png

  • 0
    TI__Mastermind 24442 points

    Hi Jimmy,

    If the tPHL and tPLH values are above the datasheet maximum values, then you are either measuring them incorrectly or you have added capacitance that is slowing down the transition. I doubt VCC=3.3V is the issue. VCC=3.3 should only affect the VOD. You can reference Figure 22 to double check that you are measuring it right. 

    Our datasheet values are calculated with 50pF of capacitance on the bus side. Attaching cabling and other transceivers will increase the total capacitance present, making the time longer. 

    Greater tPHL and tPLH values will affect total loop delay, but it will not impede communication integrity nor will it create issues at high data rates. As long as your software accounts for your networks total capacitance delay, it should not be an issue. 

    Best,

    Ethan