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THVD1500: Can We Leave THVD1500's Un-Used Input Pin 4 (D) Floating?

Wayne Chen (Audio AE)
Genius 15950 points
Part Number: THVD1500


Hi Sirs,

With RE# = low, DE = floating (receiver mode). Can we leave un-used input pin 4 (D) floating while there is internal pull up or pull down resistors?

Thank you and Best regards,

Wayne Chen
10/03/2017

  • 0
    TI__Expert 3810 points

    Hi Wayne,

    we will come back to you soon. Our team is working on your request.

    Regards

    Adrian

  • 0
    TI__Expert 3810 points

    Hi Wayne,

    when in receiver mode it's convenient to maintain DE low; with that condition both outputs turn high-impedance while the logic state at D is irrelevant.

    For your information the DE pin has an internal pull-down resistor to ground, thus when left open the driver is disabled (high-impedance) by default. The D pin instead has a pull-up resistor to power source Vcc, thus when left open while the driver is enabled, output A turns high and B turns low.

    Let me know if you need more insights on this matter.

    Best regards,

    Adrian