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SN74AVCH2T45: SN74AVCH2T45DCUR Crash and memory issue

manu
Prodigy 190 points
Part Number: SN74AVCH2T45
Other Parts Discussed in Thread: SN74AXC2T45

Hi,

When i connected refrence clock from ethernet PHY(AR8031) - 2.5V to i.MX 8 SoC - 3.3V my baord is getting crash and memory issue is coming.

If i connected refrence clock directly through OE from ethernet PHY(AR8031) to i.MX 8 SoC there is no issues. 

Clock speed 25MHz. what is the issue with this translator ?

  • 0
    Guru 317370 points

    25 MHz should work.

    Can you show oscilloscope traces of the input and output signals?

    I have not been able to find the CLK_25M pin's drive strength in the AR8031 datasheet. In theory, 200 µA should be no problem for any digital output, but you might try a translator without bus hold (SN74AXC2T45). Why did you choose one with bus hold?

  • 0 in reply to Clemens Ladisch
    Prodigy 190 points

    Thanks for the reply.

    I have attached oscilloscope traces of the input and output signals and we will also try a translator without bus hold (SN74AXC2T45).

  • +1 in reply to manu
    TI__Mastermind 46045 points

    Hey Manu,

    Is it possible to have them in the same scope shot? I don't see much issue here with the waveform, are you able to highlight where the issue happens?

  • 0 in reply to Dylan Hubbard
    Prodigy 190 points

    Hi Dyan Hubbard,

    I am not able to find, since it continues clock from ethernet PHY to SoC.

  • 0 in reply to manu
    Prodigy 190 points

    In this attached video i observed that translator output clock is varying continuedly, even input clock is running stable.