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SN74CBTLV3245A: Tpd in relation to Vcc

John Joseph
Prodigy 160 points
Part Number: SN74CBTLV3245A

 I noticed that the tpd is *higher* at a higher VCC.  This does not make sense to me. Why would the tpd be higher with a higher VCC voltage?  Shouldn't it be lower?

 

  • 0
    TI__Genius 9132 points

    Hi John,

    Thank you for using e2e.

    The propagation delay is the time between the specified reference points on the input and output voltage waveforms, with the output changing from one defined level (high or low) to the other defined level (tpd = tPHL or tPLH).

    For the SN74CBT parts, the propagation delay Is measured from 50% of the rising edge of the input signal to 50% of the rising edge of the output signal.

    As you increase Vcc, the 50% voltage level is also higher compared to at lower Vcc,  and therefore you see a slightly higher propagation delay.

    regards,

    Saminah