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Counter with serial output? — Parallax Forums

Counter with serial output?

ArchiverArchiver Posts: 46,084
edited 2001-05-04 17:57 in General Discussion
Can anyone recommend a 12-bit (or higher) ripple counter IC which has
serial output? Thanks!

steve
Steve Roberts: sroberts@s...

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2001-05-04 00:17
    >Can anyone recommend a 12-bit (or higher) ripple counter IC which has
    >serial output?

    Steve,

    Nothing comes to mind. Like a lot of other requirements mentioned here from
    time to time, it may not exist as a pre-packaged logic component. You could
    certainly make one with a CPLD, however, and bundle the rest of your logic
    with it! I see that Electronix Express is offering CPLD prototyping systems
    at extremely reasonable prices. If you want to learn the technology,
    there's no better time to do it.

    Here's the link: http://www.elexp.com/tst_pldt.htm

    Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
    Manufacturer of the famous BOB-II Serial Video Text Display Module!
  • ArchiverArchiver Posts: 46,084
    edited 2001-05-04 04:25
    At 11:51 AM 5/2/01 -0700, Stephen Roberts wrote:
    >Can anyone recommend a 12-bit (or higher) ripple counter IC which has
    >serial output? Thanks!

    How fast does it need to count? Input duty cycle?

    I could see an 8 pin 12c508 or 12c671 do this quite easily for slow speeds
    (less than 1 MHz). Faster than that - I'd look at doing it in a CPLD - my
    current favourite is the EPM7032SLC44 from Altera. Cheap, easy to code,
    easy to program, fits in a 44 pin PLCC socket. You can clock those quite
    fast - 50 or 60 MHz.

    dwayne



    Dwayne Reid <dwayner@p...>
    Trinity Electronics Systems Ltd Edmonton, AB, CANADA
    (780) 489-3199 voice (780) 487-6397 fax

    Celebrating 17 years of Engineering Innovation (1984 - 2001)

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  • ArchiverArchiver Posts: 46,084
    edited 2001-05-04 04:32
    Hi Steve,

    I'm not sure if this may help, but take a look at the following link

    http://www.phanderson.com/counter.html

    Also, philips makes a serial real time clock PCF8593 (I2C) which has an
    event counter mode. I've been wanting to try one of these for some time.

    Steve






    At 04:17 PM 05/03/2001 -0700, you wrote:
    >>Can anyone recommend a 12-bit (or higher) ripple counter IC which has
    >>serial output?
    >
    >Steve,
    >
    >Nothing comes to mind. Like a lot of other requirements mentioned here from
    >time to time, it may not exist as a pre-packaged logic component. You could
    >certainly make one with a CPLD, however, and bundle the rest of your logic
    >with it! I see that Electronix Express is offering CPLD prototyping systems
    >at extremely reasonable prices. If you want to learn the technology,
    >there's no better time to do it.
    >
    >Here's the link: http://www.elexp.com/tst_pldt.htm
    >
    >Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
    >Manufacturer of the famous BOB-II Serial Video Text Display Module!
    >
    >
    >
    >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2001-05-04 16:57
    >>Can anyone recommend a 12-bit (or higher) ripple counter IC which has
    >>serial output? Thanks!
    >
    >How fast does it need to count? Input duty cycle?
    >
    >I could see an 8 pin 12c508 or 12c671 do this quite easily for slow speeds
    >(less than 1 MHz). Faster than that - I'd look at doing it in a CPLD - my
    >current favourite is the EPM7032SLC44 from Altera. Cheap, easy to code,
    >easy to program, fits in a 44 pin PLCC socket. You can clock those quite
    >fast - 50 or 60 MHz.
    >
    >dwayne
    >
    >

    Needs to count at about 5 MHz, at a 50% duty cycle.
    Steve Roberts: sroberts@s...
  • ArchiverArchiver Posts: 46,084
    edited 2001-05-04 17:57
    If you need to count at 5MHz, you still have a choice. Fast micros like
    Ubicom's SX series can handle it, and they can be programmed with simple
    tools from Parallax.

    My personal preference would be an Altera EPM7032S, as mentioned by another
    contributor. This logic chip could, ferinstance, support a 16-bit counter
    and a 16-bit parallel-in serial-out shift register. A multiplexer could
    replace the shift register, allowing the counter chain to get even longer,
    but then your count could change during readout. Either way, using Altera's
    (free) MaxPlusII tools, the design job is trivial. You just need a device
    programming adapter cable, and that should be fairly simple to fabricate.
    Altera was charging $150 for it (ByteBlaster) last I knew...

    >>>Can anyone recommend a 12-bit (or higher) ripple counter IC which has
    >>>serial output? Thanks!

    Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
    Manufacturer of the famous BOB-II Serial Video Text Display Module!
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