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THVD1550: higher receive Tplh vs SN65HVD05 40Mbps

Tess Chen
Intellectual 2675 points
Part Number: THVD1550
Other Parts Discussed in Thread: SN65HVD05,

Hi Team,

https://e2e.ti.com/support/interface/f/138/p/712769/2627707?tisearch=e2e-quicksearch&keymatch=THVD1550%20propagation%20delay#2627707

"if a transceiver works with higher data rate, the less propagation delay it produces." 

But when comparing to SN65HVD05  40Mbps，25ns(max) receive Tplh,  THVD1550 has a higher receive Tplh 45ns max but higher 50Mbps rate. It seems different from the description above.

Question:

1. What may cause this happen? Does it relate to IC internal tech or something else?

2.What's influence for the propagation delay in application? In other words, in what situation should we highly care about this parameter?

Thanks & Best Regards,

Tess Chen

  • 0
    TI__Mastermind 25705 points

    Tess,

    It's a good question. Strictly speaking, the rise/fall time and propagation delay are two different spec, characterizing two different behaviors. The rise/fall time measures the transition edge, while the prop delay measures the time from the input to the output. Generally faster devices have smaller value on both of them. However the values are impacted by different circuitry. The driver strength governs the rise/fall time, while all internal logic/buffer switching time generates the delay. 

    The two spec of these two devices are in the same ball park. I don't think the variation is significant to impact the application. In implementation, the rise/fall time impacts the bit time. The delay becomes important when the timing of the signal path is critical.

    Regards,

    Hao