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SN65MLVD040: Power Draw clarification

Austen Royer
Prodigy 140 points

Part Number: SN65MLVD040
Other Parts Discussed in Thread: SN65MLVD203B, SN65MLVD080,

We’re looking into multipoint LVDS transceivers and are getting confused at the supply current data description (ICC) in the Electrical Characteristics table.
For a single transceiver (e.g. SN65MLVD203B), the datasheet is mostly clear – with both the driver and receiver enabled max ICC is around 24mA. There’s confusing wording however, where the test condition states “all others open.” Is this just indicating that the signal IO pins are not actually in a connected state?
Then, for multiple transceiver ICs (e.g. SN65MLVD040, SN65MLVD080) the datasheet shows a value for “Both enabled” – because the RE/DE are not numbered, is this supply current assuming that all drivers and receivers are simultaneously enabled? Or is this a supply current for a single transceiver channel on the multi-channel IC?

Thanks,

Austen

  • 0
    TI__Genius 15536 points

    Hi Austen,

    Thanks for reaching out. I will check with our internal team on this and get back to you next week. 

    Regards,

    Matt 

  • +1 in reply to Matt Smith
    TI__Genius 15536 points

    Hi Austen,

    Thank you for your patience. "All others open" is referring to any pin that is not essential to operate the device in the condition stated in the table. Also, for the multi-channel devices, that applies to all channels, not just one. For example, the driver only ICC for SN65MLVD040, the connected pins are /REx, DEx, Ax, Bx, and Dx (to apply 125MHz signal) for each channel as well and Vcc and GND. All other pins are floating. The R pin was not connected because the output current will vary depending on the loading. If there is no indication that the device is switching, then the D pin was also left floating. 

    Regards,

    Matt