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TXS0102 - Output Voltage

Kawai
Guru 19775 points
Other Parts Discussed in Thread: TXS0102

Hi Team,

Our cusotmer uses TXS0102 for 3.3V <--> 5.0V level shifting on SPI bus.
(VCCA=3.3V, VCCB=5.0V)

We have questions from our customer, could you please help us on the following question ?

[Qustion]
Please tell us why TXS0102 V_OHX is VCCX x 0.67 (MIN).

Our customer found that B side could not output 5.0V.(Actual measured voltage was 3.8V.)
I found the V_OHX(MIN) spec in the datasheet, however could not understand why.

If the output high voltage is VCCX x 0.67 (MIN), this seems that it will not meet 5VCMOS VIH.

Thanks and Best Regards,
Kawai

  • 0
    TI__Expert 6430 points

    Hi Kawai,

    TXS0102 architecture is base on tranmit gate. It means that when input is low the gate is switched on and when input is high the gate will be swithced off. Thus, when input is high (the transmit gate is switched off), the output high voltage will depend on pull-up voltage, pull-up resistor and output load resistor to ground.

    But when input is at VCCA-0.2V, the transmit gate could not be completely off which casue output is not at VCCB voltage.

    Thanks

    Wei