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SN75LVDS83 input applied with no VCC

Ed Walker
Prodigy 5 points
Other Parts Discussed in Thread: SN75LVDS83

We need to allow for inputs to be applied without VCC applied.
LVDS83A and B both have ESD clamps from input to VCC, this will allow backfeed into the VCC when unpowered and an input applied.

LVDS83 does not show the input clamps, and its ABS MAX spec on the inputs is 5.5V, the other two state VCC+0.5V.

Is it acceptable to have an input applied to the LVDS83 without its VCC applied?

  • 0
    TI__Mastermind 20985 points

    Hi Ed, I will need to ask Design about this; it may take several days.  I see your point that the LVDS83 I/O diagram doesn't include the ESD diode to Vdd.

    Best regards,
    RE

  • 0 in reply to RE
    TI__Mastermind 20985 points

    Hi Ed, sorry it took some time to find this answer.  I confirmed that the SN75LVDS83 datasheet is correct, by showing no ESD diode from inputs to VCC, and that the acceptable input voltage is -0.5V to 5.5V (not -0.5V to IOVCC+0.5V).  Inputs can be applied with no VCC.

    Best regards,
    RE