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TXS02612: About VIH threshold

Tsukui Yusuke
Guru 21930 points
Part Number: TXS02612

Hi,

Could you tell me about TXS02612 VIH threshold.
The following contents are described in the data sheet.



However, the SD card standard is generally below.



・TXS02612 ： VIH(min)＝Vcc-0.2V（@IIH＝2uA）

Vcc=3.3V　⇒　VIH(min)＝3.1V

・SD card standard ： VOH(min)=0.75×Vcc（＠IOH＝-2mA）
Vcc=3.3V　⇒　High Level(min)＝2.475V

Customers think TXS02612 can not clear the standard.
Could you give me your advice?

Best Regards,
Yusuke/Japan Disty

  • 0
    TI__Guru* 97046 points
    Hello Yusuke-san,
    From the statement above, the SD card standard requires on output impedance of (3.3-2.475)/0.002 <= 412.5 ohms

    When operating at 2 uA (as per the TXS02612 data in the message above), assuming the same (awful) driver with an impedance of 412.5 ohms, the input voltage would be:

    3.3 - (412.5*0.000002) = 3.299 V

    I don't see any problem with this.

    Additionally, most system drivers have _much_ lower impedance and will not have anywhere near the drop described in the standard. It is common to see output drivers with 10 to 25 ohm impedances.