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XRU8871 documentation

mabla pacraistu
Prodigy 20 points

Hi,

During the holidays, my dad asked me to fix an old device of his. There doesn't seem to be any visible damage (eg. leaking caps or corrosion on the PCB), so I wanted to check if all the ICs on it are still functioning correctly. However, for many of these chips I can't find any documentation whatsoever. (The device is from '93, one part bears a datecode marking of the 49th week of 1992). One of these unknown chips is an XRU8871 (photo attached below), which, according to this page, was manufactured by TI and NS (and NS has been acquired by TI a bit over a decade ago). (I also already tried contacting ROHM, to no avail, and I've just posted a similar question to the ST forums at the time of writing.) Does anyone happen to know anything about this chip? (I also don't know if this is the correct forum for this, as I don't know what the chip actually does.)

Thanks

Photo of the chip:

(FYI, the big chip on the bottom is an HMCS400-series 4-bit microcontroller.)

  • 0
    TI__Guru 71526 points

    Hello Mabla,

      An initial review of old devices, I am not able to locate any information about this device.  I am pursuing other sources, it may take a few days.  I will update this E2E by Wednesday this week.

    At your service,

    ~Leonard  

  • 0
    Guru 316780 points

    Most of the entries on that web page are from obvious scammers and contain imaginary information. The different values in the manufacturer column just show that nobody actually knows. (If that chip were so common that it was made by multiple manufacturers, the datasheets would be all over the internet.)

    I doubt that this chip came from TI. But even if it did, it would be a custom(-labelled) part without publically available information.

  • +1 in reply to LeonardEllis
    Prodigy 20 points

    With some help from elsewhere, it's most likely that it's actually a Rohm BU8871 but with a different prefix. Did TI or NS make such a chip as well at one point?

    Either way, thanks.

  • 0 in reply to mabla pacraistu
    TI__Guru 71526 points

    Hello Malba,

    Glad you were able to find more information about this IC.  Unfortunately, neither NSC nor TI had a DTMF Receiver in the portfolio. 

    I hope you are able to resolve the issue with the product.

    Regards,

    ~Leonard