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Questions about the C6670's part name

Expert 2985 points

Hi all,

Before we powered up our custom board with C6670, we got the resistance value of 0.2 Ohm between CVDD and GND using the hand-held multi-meter and the resistance value of 0.2 Ohm between CVDD and GND is 0.2 Ohm also. Is this normal? We think there must be a short circuit.

After we check the schematics and PCB, we can not find any errors. So we suspect that  there must be some errors about this C6670 itself. Actually we bought it from a seller with a very low price about 167$ of two pcs.

The C6670 we bought is as follow


From the errata of C6670, the table 1 is as follow


We find the lot trace could be 10A or 20C. So what is the C6670 we bought with Lot trace of YB20?

In another board, we find the YB20C chip as follow


 

1. So what is the difference between YB20 and YB20C? Is the YB20 very old chip?

2. How to differentiate the TMS320C6670CYP2 and TMS320C6670ACYP2 from the C6670's surface?

3.  Is the value of 0.2 Ohm between and CVDD or CVDD1 and GND normal before powering up the C6670?

 

Regards,
Feng

3

  • Feng,

    1. So what is the difference between YB20 and YB20C? Is the YB20 very old chip?

    the "20" in both part numbers indicates PG2.0 as indicated in the Errata document.  Neither device is 'old'.

    2. How to differentiate the TMS320C6670CYP2 and TMS320C6670ACYP2 from the C6670's surface?

    These are both C6670A as indicated above.

    3.  Is the value of 0.2 Ohm between and CVDD or CVDD1 and GND normal before powering up the C6670?

    We have addressed this in previous thread:

    e2e.ti.com/.../482325

    Tom

  • Hi Tom.

    1. The C6670's errata(sprz332f) shows me that there are only 10A and 20C of the lot trace but there is no description for 20.

    So what does the C means? What is difference between YB20-33V7ZK9 and YB20C-48ZCJD9? 

    I think there is something wrong about the C6670 with YB20(not YB20C) as lot trace. Please help me to confirm it is or not.

     

    2. 'A1.2GHz' shows it is C6670A, am I right?

     

    3. Sorry for the duplication of this question. To be clear, I will continue to seek help for that problem in that thread.

     

    Regards,

    Feng

  • Feng,

    You are reading too much into the marking.  The '20' is the significant part of the symbolization.  The trailing letter is not significant to the revision.

    Tom

  • Hi Tom,

    These following reasons made me want to validate the trailing letter of C6670.

    1. I had used C6670 since 2013, I always saw the YB20C on C6670 not YB20. But now I got YB20 on C6670. (I saw YB20 on C6678)

    2. I bought the 2 pieces of C6670 with a very low price(160$) that was almost half of the price(with 2 or 3 pcs) from some big electronics distributor. I suspect there are something wrong with these two chips.

    3. The C6670's errata shows me that there is 10A or 20C.

    4. After indirectly accessing to the TI Semiconductor Technical Support in China, they told me that YB20-33V7ZK9 did not exist.

    I had ordered two new chips from the other reliable distributor. There are some days I can receive the chips.

    Before I replace a new one on my board, I just want to validate this C6670 with 'YB20-33V7ZK9'.

    So could you please help me to validate the 'YB20-33V7ZK9' again even I had got some indirect responses from TI Semiconductor Technical Support in China?

    Regards,

    Feng

  • Feng,

    I will post the question to our production team.  It might take a week or 2 to get an answer.

    Tom

  • Hi Tom,

    Thanks!! I'll wait for that.

    Regards,
    Feng
  • Feng,

    Can you provide information about the distributor where you got these devices?  We also do not believe the device symbolization is valid.

    Tom

  • Any and all Part Authentication requests, part markings, and die verification should follow the anti-counterfeit process:

    In order for TI to begin the verification process all of the following information is required.  Please provide the required information to ti-counterfeit@list.ti.com for devices purchased through to TI or an authorized TI distributor.

    Required information

    1)      Completed Counterfeit Request Form. 

    2)      High quality pictures of the bottom & top of the device(s)

    3)      High quality pictures of the 2D bar code labels.  

    4)      Copies/pictures of shipping documents, i.e. packing slip showing the origin of the devices to TI .  (If this information cannot be provided we are unable to provide verification due to uncertainties regarding chain of custody of the products.)

    5)      Provide device application.

    Once the required information is provided and submitted, your request will be reviewed for verification.

    TI strongly encourages you to purchase all your TI parts either directly from TI or from authorized TI distributors (http://focus.ti.com/docs/general/distribcountryresults.jhtml) and not from the gray market or brokers.

  • Hi Tom,

    I got these two C6670 chips with 'YB20-33V7ZK9' from a second level or even less level distributor, they even do not have English corporation name which I can provide to you. 

    I suspect that these two C6670 chips with 'YB20-33V7ZK9' are modified from C6678, because I had seen YB20 on C6678. Maybe someone modified the surface silk-screen from '8' among 'C6678' to '0' among 'C6670'.

    If convenient, could you help me to confirm that the 'YB20-33V7ZK9' is actually belong to C6678?

    Regards,
    Feng

  • No further information can be provided

    Tom

  • Hi Tom,

    Thanks for your help from the beginning. 

    I had sent one email to ti-counterfeit@list.ti.com to start the verification process. Anything helpful I will post on this thread later.

    Regards,
    Feng

  • Hi Tom,

    I had confirmed that the C6670 with lot trace YB20-33V7ZK9 like this pic below is fake or broken before I got it.

    Then we order one packet of  C6670 with 44 chips from Arrow Electronics and replace the fake one with a new one.

    And then the C6670 works OK! CVDD and CVDD1 are OK! JTAG scan successfully!

    The new C6670 we ordered from Arrow is as the pic fellow

    I think the C6670 with YB20 is fake because there is only 10A or 20C in the C6670's errata Table-1.

    And we had got the confirmation that the 33V7ZK9 does not exist from TI Semiconductor Technical Support in China indirectly.

    I am very curious that what this C6670 chip with 'YB20-33V7ZK9' acutally is. Is it C6678 with the silk-screen modification? Or it is just C6670 but it is broken?

    Regards,

    Feng