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TXS02612: VIH at VCCB=1.8V

Jun Ishida
Expert 5640 points
Part Number: TXS02612

Hi team,

According to the datasheet, Vih(min) is VCCI-0.2V and it cannot meet Voh(min)=1.4V of SD standard when VCCI is 1.8V (Vih=1.8V-0.2V=1.6V). How can we think about that? Can't this device support the SD standard?

Regards,

Jun

  • 0
    TI__Guru 58370 points
    Hi Jun,

    It meets the SD standard, but to cover the whole Vcc range from 1.1 to 3.6, it is written that way. I would agree that the writing could have been improved by using a percentage of Vcc to be consistent.
    The internal one shot is tuned to trigger at Vcc/2 and hence 1.4V is enough to trigger the TXS02612 device at 1.8V.
    What is the application( SD standard, data rate etc) as this device doesnt support high speed SD?
  • 0 in reply to ShreyasRao
    TI__Expert 5640 points

    Hello ShreyasRao-san,

    Thank you for your answer.

    BTW, what is the output voltage of A-port at VCCA=3.3V and VCCB=1.8V if the input signal from SD to B-port is 1.4V?

    Regards,

    Jun

  • 0 in reply to Jun Ishida
    TI__Expert 5640 points
    Hi ShreyasRao-san,

    Additionally, can this device support 100MHz clocking speed (SDR50 UHS-I) in spite of the description of max.60MHz in the datasheet?

    Regards,
    Jun
  • 0 in reply to Jun Ishida
    TI__Guru 58370 points
    Hi Jun,

    The output on port A will be at near the Vcca level of 3.3V and is guaranteed to be above the Voh spec when the input on B is at 1.4V.

    AS mentioned in the datasheet, the guaranteed data rate is 60Mhz under the specified loading conditions. 100Mhz is more than 60% above the rated speed. Achieving this data rate is not guaranteed.