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Original question:

TXB0108: p2p device with a 200MHz data rate

TXB0108: TXB0108 & LSF0108 & TXB0304 data rate

Brian Li
Genius 13850 points
Part Number: TXB0108
Other Parts Discussed in Thread: LSF0108, , SN74AXC1T45, SN74AXC8T245, SN74AXC4T774, SN74AXC4T245

Hi team,

My customer mow is using NXP's NXB0108PW.

And now they have a test condition: 5 ns voltage pulse.

Could you please kindly help check below questions:

  1. If they want to transfer this 5ns pulse, is that means they need a device with the 200M data rate?
  2. I saw we have a figure in LSF0108: Figure 6-1. Signal Integrity (1.8 to 3.3 V Up Translation at 50 MHz), Could you please help check if we have the figure for 100MHz?
  3. Could you please help check if these 3 device can meet their requirements for 5ns pulse? Will there be any distortion?
  4. Could you please kindly help recommend a device for the 5ns pulse?

Thanks,

Brian

  • +1
    Guru 316510 points

    The timings of the NXB0108 and TXB0108 are pretty much identical.

    1. Yes, 5 ns = 200 Mbps = 100 MHz.

    2. Moving the falling edges 5 ns to the left results in the curve below. Please note that the output signal does not actually reach 3.3 V. And the speed of the output rising edge depends strongly on the value of the pull-up resistor and the capacitance.

    3. The LSF has open-drain outputs, so rising edges will be slower. The TXB devices have very weak outputs, so their speed is limited. None of them are guaranteed to work at 200 MHz.

    4. SN74AXC1T45

  • 0 in reply to Clemens Ladisch
    TI__Genius 13850 points

    Hi Clemens,

    Thanks for your quickly reply.

    SN74AXC1T45 has only one channel.

    Could you please help check if we have some devices with 4 channels or 8 channels which can meet their requirements?

    Thanks,

    Brian

  • +1 in reply to Brian Li
    Guru 316510 points

    SN74AXC4T245, SN74AXC4T774, SN74AXC8T245.