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Alternative TXS0206 Level shifter for SD Card with esd protection.

Oscar Gomez Fuente
Expert 2066 points
Other Parts Discussed in Thread: TXS0206, TXS0108E, TXS0206A

Hi everyone,

I need interface muy Host (1.8 volts) with an SD Card (3.3Volts) I would like to find the best option. I was trying to find the best option and I found this IC: TXS0206 that it's just what I need. The problem is the package. The pitch it's too small and If I use this package I'll have to change the class of my PCB so I have to find another alternative IC.

I don't mind to use one IC to ESD/EMI protection and other for level translation. But I don't achieve to get with the best option.

Could anyone try to help me, please?

Best regards.

  • 0
    TI__Expert 6335 points
    Oscar,

    You could use TXS0108E instead to achieve the level translation. It comes in a TSSOP package.

    Best Regards,
    Nirav
  • 0 in reply to Nirav Patel
    Expert 2066 points

    Hi Nirav,

    Thank you very much for your soon answer.

  • 0 in reply to Nirav Patel
    Expert 2066 points
    Hi Nirav,

    I was reading and I'm a little bit confused due to the RpuA and RpuB resistor into the TXS0108 IC. As you know I'm going to use this IC to interface a microSD card (+3.3V) with a HW platform with +1.8V, So it's mandatory I'll have to use a level shifter, up to here all right.

    The problem is that due to this RpuA and Rpub I don't know If I have to place the pull up resistors of the SD bus or I´ll have to conect them directly.

    Do you know if there is any application note to use with SD cards?

    Best regards.
  • 0 in reply to Oscar Gomez Fuente
    TI__Expert 6335 points
    Oscar,

    I think it would be helpful to read the TXS0206A datasheet that I updated in April. It has a detailed description about the device architecture and application in SD cards. Much of the information in that datasheet can be applied to the TXS0206 and TXS0108E.

    The difference between the TXS0206A and the TXS0206A is the presence of an integrated EMI filter. TXS0206 includes this filter while the TXS0206A does not.

    The major difference between the TXS0108E and the TXS0206 (and TXS0206A) is the architecture of the clock channel. The TXS0108E uses a bi-directional auto-sensing architecture, while the TXS0206/A uses a undirectional buffer. This means that the TXS0206/A will provide better drive strength for the SD clock.

    You won't need to add any external pullup resistors. RpuA and RpuB are in all three devices. Infact adding external pullup resistors will elevate the VOL of the translator.

    Best Regards,
    Nirav
  • 0 in reply to Nirav Patel
    Expert 2066 points

    Ok Nirav,

    Then the TXS0108E it's a good option for SD card level shifter. But now I've another doubt: Should I place an EMI/ESD filter?

    These are the two possibilities:

    1º.- Only level shifter TXS0108E (ESD protection):

    2º.- Or level shifter TXS0108E with EMI/ESD protection TPD6FR003 (ESD + EMI):

    I know that the TXS0108E has ESD protection.

    Do you consider it is better to add an EMI/ESD filter for this solution?

    Best regards.