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DS90LV011AQ-Q1: LVDS Transmitter and Receiver with Independent Power Supplies

Attila Molnár
Prodigy 80 points

Part Number: DS90LV011AQ-Q1
Other Parts Discussed in Thread: DS90LT012AQ-Q1

Tool/software:

Dear Support Team,

We are integrating the DS90LV011AQ-Q1 (transmitter) and DS90LT012AQ-Q1 (receiver) into a new project. These components will be located on separate printed circuit boards (PCBs) with independent power supplies. We have identified two critical operational scenarios and require your expertise to ensure operation reliability.

Scenario 1: Transmitter Board Powered, Receiver Board Unpowered

  • The DS90LV011AQ-Q1 (transmitter) is powered with 3.3V (VDD = 3.3V).
  • The DS90LT012AQ-Q1 (receiver) is unpowered (VDD = 0V).
  • Our primary concern is whether the DS90LV011AQ-Q1 (transmitter) will sustain damage if its outputs (OUT+ and OUT-) attempt to drive the unpowered DS90LT012AQ-Q1 (receiver).
  • Also we are concerned if the DS90LT012AQ-Q1 (receiver) will be damaged by receiving voltage on its inputs (IN+ and IN-) while it is unpowered.

Scenario 2: Transmitter Board Unpowered, Receiver Board Powered

  • The DS90LV011AQ-Q1 (transmitter) is unpowered (VDD = 0V).
  • The DS90LT012AQ-Q1 (receiver) is powered with 3.3V (VDD = 3.3V).
  • We need to know if the DS90LV011AQ-Q1 (transmitter) could be damaged by backwards current on its outputs from the powered DS90LT012AQ-Q1 (receiver).

We kindly request your prompt and detailed technical guidance on these matters.

Thank you for your assistance.

Sincerely,

Attila

  • +1
    Guru 325350 points

    The absolute maximum ratings allow voltages at the respective output and input pins. The datasheets say "Power Off Protection (Outputs in TRI-STATE)" and "Power Down High Impedance on LVDS Inputs".

  • +1
    TI__Expert 3170 points

    Hi Attila,

    Clemens is correct. The feature "Power Off Protection (Outputs in TRI-STATE)" for the driver indicates its outputs will be high impendence when unpowered. The feature "Power Down High Impedance on LVDS Inputs" for the receiver indicates the LVDS inputs will be high impedance when unpowered. Both feature protect the devices from the scenarios you described.

    Regards,

    Jack