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TXS0206A: Use with SD Card in SPI mode.

John Condon55
Prodigy 160 points
Part Number: TXS0206A
Other Parts Discussed in Thread: SN74AXC8T245, TXB0106

Greetings,

I need a voltage level translator between my MCU (1.8v) and SD Card (3.3V). However, since my host processor doesn't have an SDIO peripheral, I'll be using SPI-mode only. Is the TXS0206A still a suitable part? If so, can the the DAT1A, DAT1B, DAT2A, and DAT2B pins be left floating or pulled high?

Thanks!

  • 0
    TI__Genius 16735 points

    Hi,

    So the TXS devices are most suitable for open-drain applications since it has internal pullups.

    Can you provide a schematic of what channels you need?  Maybe you can use something like the SN74AXC8T245 or the TXB0106?

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Prodigy 160 points

    We need the SPI channels of the SD Card: CS (Pin 2), MOSI (Pin 3), SCLK (Pin 5), and MISO (Pin 7).  See below for the requested schematic. Note that we pinned out the non-used pins of the SD Card so they wouldn't be floating. I do see that the datasheet specifically calls out Push-pull driving specifications. 

  • 0 in reply to John Condon55
    TI__Genius 16735 points

    Hi,

    Yes, this device should work for your design. Please make sure it meets your data rate requirements. The data channels on this device can be left floating since it has internal pull ups. However any CMOS inputs like the enable pin need to have a valid logic state of GND or VCC.

    Thanks!

    -Karan