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TXS0104E: Level shift between MSP432P411V and AM3352

Shunsuke Goya
Intellectual 2255 points

Part Number: TXS0104E
Other Parts Discussed in Thread: AM3352

Hello Team,

Our customer want to use TXS0104E for level-shift from 3V to 2V and from 2V to 3V(bi-direction).

Master : AM3352  / 3V-side
Slave : MSP432P411V / 2V-side

Is TXS0104E able to use as "LEVEL SHIFT" between MSP432P411V and AM3352?
If your answer is Yes, please prepare a peripheral schematic of TXS0104E,  MSP432P411V and AM3352.

Best Regards,

Shunsuke Goya

  • 0
    Guru 322010 points
    See figure 11 in the datasheet.

    If the level shifter should always be enabled, you can connect OE directly to Vcc.
  • 0 in reply to Clemens Ladisch
    TI__Intellectual 2255 points
    Thank you for your response.
    Did you confirm VOL of TXS0104E, VIL of MSP432P411V@2V and VIL of AM3352@3V?
    If you answered with confirming the my above question, I would understand that customer can use it such as Fig11.
    Could you please teach me how to select a value of Pull-Down resistor?
  • 0 in reply to Shunsuke Goya
    Guru 322010 points

    The TXS uses passive switches and does not really have VIL/VOL; the output voltage is the input voltage plus the voltage drop across the pass-gate transistor (which has a worst-case resistance of 500 Ω).

    The worst-case output impedance of a MSP pin is about 250 Ω at 2 V; of the AM, 110 Ω at 3 V. Assuming that there are no other pull-up/-down resistors on the signal lines, the current that the driving pin must sink is determined mostly by the TXS's internal pull-up resistors (2× 40 kΩ), and is about 125 µA. When the MSP drives a low signal, the voltage at the AM input is 0.07 V; when the AM drives low, the MSP sees 0.04 V.

    For the OE pull-down resistor, use 10 kΩ, or see the application report Choosing an Appropriate Pull-up/Pull-down Resistor (SLVA485).