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TXS0104E: Definition of VOH

Hirokazu Takahashi
Expert 8420 points
Part Number: TXS0104E

Hello Team,

The datasheet 6.6 Electrical Characteristics defines VOHA, Port A output high voltage, as VCCA x 0.8.
In case of output "H", the internal transistor will be off and high impeadance status. Is it correct?
If correct, please let me know the reason why datasheet defines as VCCA x 0.8.

Best Regards,
Hirokazu Takahashi

  • 0
    Guru 317370 points

    In the "H" state, the transistor is off, and the voltage is determined by the pull-up resistor.

    The VOHA specification is for the listed (worst-case) test conditions, where the pin sources a current of 20 µA. The voltage is lower than VCC because the current generates a voltage drop over the pull-up resistor.

    In practice, the leakage current of the external device will be much smaller than 20 µA, so the voltage drop will also be much smaller.