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TMS320C6655: LINE DOWN: Can "25" (1.25GHz) parts be used in applications designed for 1GHz parts without board modifications?

Don Koch
Prodigy 10 points
Part Number: TMS320C6655


We have an established board that was designed around a TMS320C6655CZHA part.  Due to supply issues, our contract manufacturer used a TMS320C6655CZHA25 part instead.

None of the boards are working, and we have a line down situation.

What is the functional differences between these two parts?

What modifications to our boards might be necessary to get the 1.25GHz parts to work in our 1GHz application?

  • 0
    TI__Guru* 84475 points

    HI Don

    I would recommend checking on 2 things

    1) I believe the 1.25 GHz device will likely boot up at 1250 MHz. Refer to Table 6.29 in the datasheet - It would be good for you to see if you can confirm PLL configuration and device frequency. If you were assuming 1 GHz operations etc. 

    2)  The 1.25GHz  devices maybe from stronger silicon , that would typically mean that for a given voltage and temperature they may have higher static (leakage) current , additionally if they are running at 1.25 GHz instead of 1GHz perhaps you are overshooting your power budget?

    It would be good to get further details on

    1) What is the nature of failures. 

    2) How many board build vs how many failing 

    3) See if you have a way to measure current or device frequency on new boars with 25 silicon vs any golden reference 1 GHz board, to understand the differences. 

    Hope this helps

    Regards

    Mukul