Substituting for "recirculating shift register"

Discussion in 'General Electronics Chat' started by bob800, Oct 5, 2012.

  1. bob800

    Thread Starter Member

    Dec 10, 2011
    48
    3
    I'm trying to find a substitute IC for the ancient "2524", 512-bit recirculating shift register (for use in a TV typewriter circuit). The datasheet can be found/downloaded here.

    After some researching, it appears that this is simply an enormous "ring counter", but with only the last D flip-flop available for output (?). I've searched Digikey, Mouser, Jameco, using the search term of "ring counter" among many other types, but I can't find anything like the 2524! Is there another name for this that I'm missing? (I've tried "recirculating shift register", of course).

    I would really appreciate if anyone could point me in the right direction!

    Thanks,

    bob800
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,018
    3,235
    The longest I know of is the CD4517 dual 64-bit shift-register. You would need four of them connected in series to give you 512 bits. That would not be difficult to do.
     
  3. MMcLaren

    Well-Known Member

    Feb 14, 2010
    759
    116
    Do you have a link to the circuit you're trying to build, please? I'd love to see what it looks like. Thanks...
     
  4. bob800

    Thread Starter Member

    Dec 10, 2011
    48
    3
    Thanks! It looks like that's my best option...

    Here's the magazine article I was referencing (see the schematic on the 14th page): http://www.google.com/url?sa=t&rct=...hICADQ&usg=AFQjCNE5oA_7mjmImYsq2vW4zKKhkV2Mog

    And if you're interested, the full "TV Typewriter Cookbook" by Don Lancaster: http://www.google.com/url?sa=t&rct=...qIC4CQ&usg=AFQjCNESvQkokaM3oJ7ql_Si_7P7_GVRVA
     
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