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I cannot to find SN79518 datasheet from Texas Instrument!!!

Andrey Bykov
Prodigy 40 points
Other Parts Discussed in Thread: SN55452B

Hi!

I have a problem inside old industrial PLC from Allen&Bradley.It age more than 20 years. I guess problem is old driver  from TI named SN79518P in DIP-8 .

But I don't can find any information about this chip in internet :-(.

Can anyone give to me direction for my serching?

  • 0
    TI__Guru 71526 points

    Hello Andrey, 

    This device was designated obsolete in 1998.  You can find information at our obsolete device vendor, Rochester Electronics:  https://www.rocelec.com/search?q=sn79518 . 

    At your service,

    ~Leonard 

  • 0 in reply to LeonardEllis
    Prodigy 40 points
    Hello Leonard!
    Thank you very much for help!
    But I don't see any specification on the mention site :-(
    Could you please send me SN79518 datasheet or datasheet for similar transiver?
  • 0 in reply to LeonardEllis
    Prodigy 40 points
    I would like to get datasheet for SN79518P from archives Texas Instruments and recomendation for compatibility SN79518P with other transivers from TI.
  • 0 in reply to Andrey Bykov
    TI__Guru 71526 points

    Hi Andrey, 

    We have been searching in many places for any information on this device.  Since it was obsoleted over 20 years ago, this has presented a challenge, but regardless, we are still pursuing every possible avenue to obtain any information available.  

    I'm wondering if you have contacted Allen-Bradley?  What is the part number of the PLC where this device is used?  Do you have a schematic you can share?  This would help to find a replacement device, to see how it is actually used in the design.  There is a possibility that the SN79518 was a custom or privately marked device, and if we can see how it is used in the circuit, perhaps we can see a standard catalog equivalent. 

    And just to clarify, have you identified some defective devices in these PLCs and you are wanting to replace the ICs?  If so, you could purchase the actual device from Rochester Electronics, as they have over 140,000 of these in stock! (and as a side note, I sent Rochester a request for datasheet, so far, they have not found anything). 

    I (and 3 other people) am continuing to look for any information available and will send that to you just as soon as I find something. 

    Thank you for your patience.

    ~Leonard   

  • 0 in reply to Andrey Bykov
    TI__Guru 71526 points

    Hello Andrey, 

      We have not verified this absolutely, but from what we were able to trace, we believe the SN79518 is the same as the SN55452B.  Assuming you have the schematic for your PLC, see if this matches the functions: 

    SN55452B[slrs021a].pdf

    We will continue to check if indeed this is 100-percent compatible.

    ~Leonard  

  • 0 in reply to Andrey Bykov
    TI__Guru 71526 points

    Hi Andrey,

      Still waiting to hear from you as to providing a schematic, and the Allen-Bradley PLC product number.  We believe we have reconstructed the SN79518 part number creation path, but still are not 100-percent sure, so we need some documentation and feedback from you, please!

    In advance, thank you,

    ~Leonard  

      

  • 0 in reply to LeonardEllis
    Prodigy 40 points
    Hello Leonard!
    Thank you very much for respond!
    Exuse me for delay! I realy was very busy on my job.
     
    Allen&Bradley don't replyed to me about electric circuits request of damaged module.
    But we fixed module without any circuits  .
    Module's number: 1785-BCM/C. This is backup module for PLC-5/30 redundant industrial system.
    About SN79518: I like your idea that IC was a custom market device. And now different vendors sale last parts around the world. I guess, you are right and SN55452B is very close analog for SN79518. When I look at diagramms on my scope I can confirm that pin's function of ICs the same.
    Tommorow we will continue testing our module inside overall system.
    I don't explain you what reason of module damage beacause I don't found any broken parts, exept two relays which was are "sticky".
    Few words, after manipulation with soldering/desoldering station module came back to life!
     
    Thank you very much Leonard for help!
    Inside our old equipment a lot of obsolete components from TI, Unitrode and National Semiconductors and I guess I will have to ask you help in future.
     
    Best regards
    Andrey Bykov