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SN65LVDS33-EP: Clarification on Max Achievable Data Rate of SN65LVDS33-EP and SN55LVDS32

Dhir Gandhi
Prodigy 190 points
Part Number: SN65LVDS33-EP
Other Parts Discussed in Thread: SN55LVDS32

Tool/software:

Hello,

I need help understanding the maximum achievable data rates for the SN65LVDS33-EP and SN55LVDS32 devices.

The SN55LVDS32 datasheet mentions that it can operate at 100 Mbps max. Could you please confirm if this 100 Mbps is per channel or the combined throughput for all 4 RX channels?

Additionally, the SN65LVDS33-EP datasheet specifies a maximum data rate of 400 Mbps. However, when comparing the switching characteristics of both ICs, the SN55LVDS32 appears to have better timing parameters. This raises the question—shouldn’t the SN55LVDS32 be capable of operating at similar data rates as the SN65LVDS33-EP?

Could you please help clarify these points?


  • +1
    TI__Guru 52192 points

    Hi Dhir,

    So the switching characteristics are what are important here - not what the first page/product page say. 

    Since these are receiver devices the thing that caps max data rate is going to be propagation delay - if you look at worst case scenario each RX channel on the 32 device you are looking at ~160Mbps per channel and if you look at the 33 device you are actually looking at about 125Mbps worst case on each channel. 

    Realistically they are pretty similar and the 400Mbps has to be for the entire package on the 33 because there is no way to hit 400Mbps on each channel. Both devices should assume around 100Mbps per channel which gives margin for real systems as well. 

    So to answer you question succinctly: Both devices can handle 100Mbps per channel worst case scenario (assuming setup is similar to test setup) - the 32 is slightly faster (about 25% faster worst case) - the datasheet marketing seems odd though so I understand where the confusion came from. 

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    Prodigy 190 points

    Thanks Parker!