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5962R9583301VFA LVDS Driver Output

Chau Brown
Prodigy 60 points
Other Parts Discussed in Thread: DS90C031QML-SP, STRIKE

The DSCC 5962-95833 spec lists, in the absolute maximum ratings section, the output voltage (Dout+, Dout-) as -0.3V to (Vcc+0.3). Does Vcc in (Vcc+0.3V) mean the applied Vcc -- i.e., the actual supply voltage of part in the circuit? For a 5962R9583301VFA device that is off (not powered, Vcc = 0V), is the 5962R9583301VFA part stressed if one of the +/- outputs inadvertently sees 3.3V?

  • 0
    TI__Mastermind 29655 points

    Hi Chau,

    I looked at the part datasheet and saw that the input voltage (DI) ranges from -0.3 to (Vcc + 0.3), and the output voltage (DO+/-) ranges from -0.3 to +5.8 V. In your question, did you mean the input voltage?

    In the case of what you are seeing with -0.3 V to (Vcc + 0.3), Vcc corresponds to the applied Vcc, as you have suggested. This max spec for the DS90C031QML-SP is related to the absolute maximum so that you do not trigger the ESD diode.   Regarding whether the part becomes stressed to the point of damage, that is largely dependent on whether you apply a static differential input to the DS90C31QML while Vcc = 0 V or whether it is just a momentary ESD strike on the scale of less than a microsecond.

    A good reference for more information on this topic are in the two blog posts fellow colleagues have written about ESD:

    https://e2e.ti.com/blogs_/b/analogwire/archive/2015/06/05/clamp-diodes-a-one-way-street

    https://e2e.ti.com/blogs_/b/analogwire/archive/2015/12/02/what-you-need-to-know-about-internal-esd-protection-on-integrated-circuits

    Thanks,

    Michael

  • 0
    Prodigy 60 points
    Hi, Michael

    I am looking at the DSCC spec 5962-95833. The DSCC spec list (Vcc+-0.3) max for both input voltage and output voltage (Dout+/Dout-). The manufacturer's spec does not list the output voltage as (Vcc+0.3) max. Which spec applies -- DSCC or manufacturer's part spec -- to the 5962R9583301VFA device? If DSCC, if the output sees 3.3V when the device is off, is there an ESD diode at the output that can be forward-biased?

    Thanks,
    Chau
  • 0 in reply to Chau Brown
    TI__Genius 17125 points

    The TI datasheet for the DS90C031QML-SP has the correct, up to date information and the SMD has out of date information.

    For device  5962R9583301VFA, when there is no supply voltage, the outputs are high impedance.   The abs max voltage is 5.8V and independent of supply voltage.

    This was not the case on the original mil part released in 1997, and the output abs max was dependent upon the supply voltage.   When the space grade part was released in the 2000 timeframe, the outputs were changed so that they would go into high impedance when there was no supply.   The mil part also had that change.  Apparently, the SMD did not get updated with this information.   I will contact DLA about this.