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TXS0102 Vil and Vol

Gibson Kim
Prodigy 420 points
Other Parts Discussed in Thread: TCA9517

Hi,

I am referring an e2e post here about Vil and Vol: http://e2e.ti.com/support/interface/etc_interface/f/391/p/334140/1165651#1165651

I would like to have some more clarification on the Vil and Vol spec. Please advise.

My customer's I2C slave works around 400-450mV at LOW state (VCCA=3.3V) and would like to have Vol as low as 0V (VCCB=5V).

According to datasheet and the answer in the post, what I can expect is 400mV + gate voltage drop, while the Max Vol spec is 400mV (when Vil <150mV).

Can you please confirm if 400mV Vil is okay? Would there any other part you can recommend that the Vol (B side) stays ~0V while the Vil (A side) is 400mV?

Thanks, Gibson

  • 0
    TI__Guru 59770 points
    Hi Gibson ,
    I will move your post into voltage translation for better support .
    note that if the input is driven by open drain device , the Vil of the input will be your Vol at the output since the pullup resistor doesn't change the low levels.
  • 0 in reply to ShreyasRao
    TI__Mastermind 21675 points
    Hello Kim,
    I believe you just got a response from our I2C expert about this but I wanted to post this so other could benefit from this topic.

    "I would suggest looking at the TCA9517. It is a buffered translator, and has VIL_max of (0.3 * vcca) (3.3 V) on the A side. Your VOL on the B side will be ~0.5V (static voltage offset used to prevent latchup conditions)."
    -Francis Houde