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AM26LV32E: Skew and Datasheet Questions

Kazuki Itoh
Genius 10900 points
Part Number: AM26LV32E
Other Parts Discussed in Thread: AM26LV32,

Tool/software:

Hi team,

Could you please address customer's questions below?

  • Could you explain why the two skew values differ between the AM26LV32E and the AM26LV32?
  • Could you provide the actual skew performance for the AM26LV32E? Our customer’s production design is marginal, and we are concerned.
  • Unlike the competing part RAA7884QR4GSP, the 32 Mbps data rate is not specified in the EC table of the AM26LV32E datasheet. Could you let us know the reason?

Best regards,
Kazuki Itoh

  • 0
    TI__Guru* 75011 points

    Kazuki,

    Kazuki Itoh said:
    Could you provide the actual skew performance for the AM26LV32E? Our customer’s production design is marginal, and we are concerned.

    What customer is this? Do we have an active NDA? What Vcc and temperature are they asking for specifically?

    Kazuki Itoh said:
    Could you explain why the two skew values differ between the AM26LV32E and the AM26LV32?

    The non E version has a larger margin of safety. 

    Kazuki Itoh said:
    Unlike the competing part RAA7884QR4GSP, the 32 Mbps data rate is not specified in the EC table of the AM26LV32E datasheet. Could you let us know the reason?

    The AM26LV32E has the typical frequency in the EC as 32MHz.

    -Bobby

  • 0 in reply to BOBBY
    TI__Genius 10900 points

    Hi Bobby,

    Thank you for your support. I sent customer information from Webex as this is open forum.

    I'm checking Vcc and temperature.
    Could you elaborate on why the non E version has a larger margin of safety?

    Best regards,
    Kazuki Itoh

  • 0 in reply to Kazuki Itoh
    TI__Guru* 75011 points
    Kazuki Itoh said:
    Could you elaborate on why the non E version has a larger margin of safety?

    I suspect the systems engineer either copied a competitor's max values or they padded it due to higher standard deviation or Cpk. 

    -Bobby

  • 0 in reply to BOBBY
    TI__Genius 10900 points

    Hi Bobby,

    BOBBY said:
    I suspect the systems engineer either copied a competitor's max values or they padded it due to higher standard deviation or Cpk. 

    I think it lacks specificity, so the customer will not be convinced.
    Could you double‑check this with the systems engineer?
    We need a factual answer, not a guess.

    Best regards,
    Kazuki Itoh

  • 0 in reply to BOBBY
    TI__Genius 10900 points

    Hi Bobby,

    BOBBY said:
    What Vcc and temperature are they asking for specifically?

    Please provide the actual skew values at Vcc=3.3V and temperatures of 25°C and 80°C.

    BOBBY said:
    The AM26LV32E has the typical frequency in the EC as 32MHz.

    Regarding the data rate feedback, the datasheet for the AM26LV32E lists 32MHz as a typical value in the Electrical Characteristics as you mentioned.
    However, the product folder shows a maximum signaling rate of 32Mbps for the AM26LV32E.
    This difference between max/typ is causing confusion. Could you please revise this?



    Best regards,
    Kazuki Itoh

  • +1 in reply to Kazuki Itoh
    TI__Guru* 75011 points
    Kazuki Itoh said:
    Could you double‑check this with the systems engineer?
    We need a factual answer, not a guess.

    Not sure how. The device was made in the year1990. Systems engineer for this device probably isn't at TI anymore.

    Padding the max values based on standard deviation of 6 sigma is a standard TI practice. Some even go higher. It depends on the systems engineer.

    Kazuki Itoh said:
    Please provide the actual skew values at Vcc=3.3V and temperatures of 25°C and 80°C.

    I've sent you the information through email. The summary is, data collected is heavily padding the typical and max values. Based on the actual measurements, the PCB and actual load will introduce more skew than the device itself.

    -Bobby

  • 0 in reply to BOBBY
    TI__Genius 10900 points

    Hi Bobby,

    Thank you for your support.

    Could you please comment on this custoemr feedback?

    Kazuki Itoh said:
    However, the product folder shows a maximum signaling rate of 32Mbps for the AM26LV32E.
    This difference between max/typ is causing confusion. Could you please revise this?

    Best regards,
    Kazuki Itoh

  • +1 in reply to Kazuki Itoh
    TI__Guru* 75011 points

    Kazuki,

    I will work with marketing to see if we can change the product page to state typical and call out 32MHz to match the datasheet.

    -Bobby