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C6745 I/O pin stress tolerance question

Hirofumi Fujita
Intellectual 1780 points

HI,

 Let me confirm a bit about the I/O pin stress tolerance of the C6745 (QFP package) device.

1. Is there any acceptable condition to provide "high" state on the any input pin (like McASP, SPI etc) with out supplying any voltage on the DVDD & CVDD ?

2. Is there any specification about the latch-up tolerance ? (such as AECQ100 compliance ?)

best regards,

Hirofumi Fujita

  • 0
    TI__Guru*** 125430 points

    Hirofumi Fujita said:
    1. Is there any acceptable condition to provide "high" state on the any input pin (like McASP, SPI etc) with out supplying any voltage on the DVDD & CVDD ?

    No -- the absolute maximum ratings specify the input range as -0.3V to DVDD+0.3V.  Therefore if DVDD=0.0V then the absolute maximum voltage that can be applied to any pin is 0.3V.

    Hirofumi Fujita said:
    2. Is there any specification about the latch-up tolerance ? (such as AECQ100 compliance ?)

    The c674x is not Q100 qualified in general.  For peripherals where you would have external device insertion/removal (e.g. USB, SD/MMC, etc.) you should have dedicated ESD protection external to the processor.

  • 0 in reply to Brad Griffis
    TI__Intellectual 1780 points

    Hi Brad,

    Thank you for the comment. And let me confirm a bit more details.

    Brad Griffis said:
    The c674x is not Q100 qualified in general.  For peripherals where you would have external device insertion/removal (e.g. USB, SD/MMC, etc.) you should have dedicated ESD protection external to the processor.

    I agree that the necessity of any external protection for those pins which will connect/disconnect  external device.

    But for qualification topic, for example C6748 has just extended temperature option, but C6745/C6747 has not only extended temperature option, but also automotive range option.  Are those automotive option devices aren't qualified with such as AEC-Q100 neither?

    best regards,

    Hirofumi Fujita

  • 0 in reply to Hirofumi Fujita
    TI__Guru*** 125430 points

    Although it is available in the automotive temp range it is not Q100 qualified. Q100 qualification goes way beyond temperature range.

  • 0 in reply to Brad Griffis
    TI__Guru*** 125430 points

    Fujita-san,

    I apologize, but I need to retract my previous statement.  I have just discovered that the 'T' devices are in fact Q100 qualified devices.  I have requested that this be explicitly stated in the documentation to avoid such ambiguities.

    Best regards,
    Brad