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TXB0104-Q1: Question for VIL of TXB

Lee, Sam
Expert 6025 points
Part Number: TXB0104-Q1
Other Parts Discussed in Thread: TXS0108E-Q1

Hi team,

A customer wants to use TXB0104-Q1 due to VIL>=0.4V, instead of TXS0108E-Q1. However, they ask some quesitons

-. For VIL (TXB0104-Q1 : 0.35 * Vcc = 1.15V, TXS0108E-Q1 : 0.15V), the two devices are differenct each other. Can you explain why?

-. The higher TXB0104-Q1's VIL, the more susceptible to noise. Does the device have any features/coutnermeasres on that respect?    

Thanks,

Sam Lee

  • 0
    TI__Guru 61970 points
    Hi Sam,

    The difference between TXB and TXS is that the TXS is a switch type device (S=Switch) and TXB is a true buffer type device(B=Buffer).
    As such, the TXB adheres to the common logic threshold of Vih and Vil (0.7Vcc and 0.35Vcc) whereas the TXS has lower Vil to ensure that the Vol is below the rated datasheet spec.
    You can also increase the Vil and the output Vol of the TXS will be slightly above the Vil.
    This is explained in detail in this app note below:
    www.ti.com/.../scea056.pdf