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TMS320C6742: confim the device electorical specification

Kaka
Guru 24520 points
Part Number: TMS320C6742

Hi TI expert,

Please le me confirm the following question.

[QUestion]

Would you please teach me the specification of undershoot ??

Also would you please teach me the  time limitation of overshoot and undershoot?

Best regards.

Kaka

  • 0
    TI__Guru**** 161600 points
    Hi,

    This is described in the Data Manual, See Chapter 5, Table 5.1 Absolute Maximum Ratings Over Operating Case Temperature Range.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Guru 24520 points

    Hi Yordan

    Thank you for response.
    I know that data sheet provide this speculation but I could not understand the mean of description on.
    According to the data sheet , the overshoot undershoot is the Dvdd +20%. Does this mean the 3.3V + 0.66V when DVDD is 3.3V? It seems that the it is exceeded the aboslute maximum rating of device(3.6V or 3.8V). What do think? How about undershoot? I could not find the spec of this. Would you please show me the value of undershoot if the vdd is 3.3V?

    Also, would you please teach me how should we consider the time limitation? I could not understand the mean of "up to 20% of Signal Period".
    If the period was 1s, will the time limitation be 200ms?

    Best regards.
    Kaka

  • 0 in reply to Kaka
    Guru 24520 points
    Hi Yordan,

    Would you please provide your answer for my question by end of today in Japan time?

    Best regard.
    Kaka
  • 0 in reply to Kaka
    TI__Guru**** 161600 points
    Hi,

    According to the data sheet , the overshoot undershoot is the Dvdd +20%. Does this mean the 3.3V + 0.66V when DVDD is 3.3V?

    Correct. This is listed in the absolut maximum ratings.

    lso, would you please teach me how should we consider the time limitation? I could not understand the mean of "up to 20% of Signal Period".
    If the period was 1s, will the time limitation be 200ms?

    Your understanding is correct.

    I've notified the hw team.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Guru 24520 points
    Hi
    Thank you for response.
    Could you please provide the answer for the rest questions as below??

    Best regards
    Kaka

    >It seems that the it is exceeded the aboslute maximum rating of device(3.6V or 3.8V). What do think? How about undershoot? I could not find the spec of this. Would you please show me the value of undershoot if the vdd is 3.3V?
  • 0 in reply to Kaka
    TI__Mastermind 43660 points
    Kaka,

    The overshoot and undershoot specification are same and you could able to see it in absolute maximum ratings. Please don't confuse with the input supply maximum limit and output voltage ranges, these two limits are completely different.

    Regards,
    Senthil
  • 0 in reply to Senthilkumar Srinivasan
    Guru 24520 points

    Hi Senthil,

    Thank you for your response. I got it for the different.
    So, you mean that the undershoot range is from -0.66V to 3.96V when DVDD is 3.3V, right? I would like to know the minimum voltage value.

    By the way, I also referred the following post.

     


    If the signal was DC signal(not period signal), what is undershoot/overshoot of the maximum limitation time? Should customer follow the value of "-0.3V to DVDD + 0.3V"?

    Best regards.

    Kaka

  • 0 in reply to Kaka
    TI__Mastermind 43660 points
    Kaka,

    The overshoot and undershoot spec is 20% of DVDD for up to 20% of the cycle. This is saying that it can overshoot OR undershoot by 20% of DVDD.

    Regards,
    Senthil
  • 0 in reply to Senthilkumar Srinivasan
    Guru 24520 points
    Senthil,

    I got it.

    Best regards.
    Kaka