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SN65MLVD204B: Basic question of LVDS

cayden liu
Intellectual 1276 points
Part Number: SN65MLVD204B

Hi TI,

1.What is different between MLVDS and BLVDS?

2.I see the number of receiver nodes is 2-32. But BLVDS driver current is only ~10mA. Can I drive 32 nodes simultaneously? What is the total output current of SN65MLVD204B?

3.Is it possible to use LVDS to receive the signal sent from SN65MLVD204B (MLVDS)? MLVDS has greater driving capability, will it break down LVDS?

Thanks~

  • +1
    Guru 316240 points

    1. BLVDS is a proprietary interface created by National Semiconductor; M-LVDS was later standardized by EIA/TIA, with a wider common-mode voltage range.

    2. Receivers have a very high impedance; adding receivers only increases the capacitive load (and thus limits the rise/fall time). BLVDS/M-LVDS transmitters have a higher drive strength because they need to drive not one but two termination resistors (one at each end of the bus).

    3. This is allowed; the higher drive current will result in a higher voltage drop over the termination resistor, which is no problem.

  • +1
    TI__Mastermind 21580 points

    Hello Cayden,

    Adding to what Clemens wrote,

    1) Practically they are the same. Both interfaces are targeted for heavily loaded backplanes and both transmitters output around 11mA of current. Additional information can be found here, SNLA184.

    2) Yes, you can either use BLVDS or MLVDS to drive up to 32 nodes. 

    3) Yes you can use an LVDS receiver with the MLVD204B. Just ensure the input doesn't exceed the 'maximum input differential voltage' of the LVDS receiver you are planning on using.

    Regards,

    Josh  

  • 0 in reply to Joshua Salinas
    TI__Intellectual 1276 points

    Thanks Joshua, Clemens.

    Can we provide a reference design for using LVDS receiver (CPLD) with the MLVD204B.

    Br

    Cayden

  • +1 in reply to cayden liu
    TI__Mastermind 21580 points

    Hello Cayden,

    I checked our ti.com website and don't see any mention of a reference design with an LVDS receiver and the MLVDS204B.

    Regards,

    Josh