Digital Clock IC

Discussion in 'The Projects Forum' started by daviddeakin, Feb 27, 2010.

  1. daviddeakin

    Thread Starter Active Member

    Aug 6, 2009
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    Don't mean to hijack this thread, but does anyone know if there is an all-in-one clock chip on the market any more? (Something like the old MM5314 variety, which took mains frequency in one end and put out 7-seg or BCD signals at the other). I have built a couple of clocks using logic, but I was hoping to cut down on my parts-count next time, and I don't have the ability to program MCUs.
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    A real-time clock IC is probably the closest thing to what you are looking for.

    By the way, I have relocated your query in a thread of its own.

    hgmjr
     
  3. hgmjr

    Moderator

    Jan 28, 2005
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    Here is a link to the selection page on the Digikey website.

    hgmjr
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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  5. MMcLaren

    Well-Known Member

    Feb 14, 2010
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    I remember building a digital clock using one of those special purpose ICs back in the 70's. Not sure if there's anything like those ICs around any more, but, on a somewhat related note, I did build a novelty single chip Clock/Calendar/Timer with a six digit Charlieplexed 7-segment display last year using an 18-pin PIC16F88 (sorry)...

    Kind regards, Mike

    [​IMG]

    [​IMG]
     
  6. daviddeakin

    Thread Starter Active Member

    Aug 6, 2009
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    Aha! Yes I had seen these chips on Farnell, but looking at the datasheets I couldn't figure out what to actually do with them.
    For example, the PCF8563 http://www.farnell.com/datasheets/60445.pdf
    How do you go abotu setting the time/date, or does it get it from GPS or something? Additionally, assuming I actually managed to get the thing putting out the right numbers/dates in BCD, is it actually possible to decode it without an MCU (and without extraordinary numbers of logic ICs)?

    EDIT: Idea! Perhaps feed the BCD output into a serial>parallel shift register and then feed the outputs of the register straight to 7-seg display drivers? (I'm really only interested in the time, not the date or other functions)

    Beenthere, the Maximim chip appears to need an MCU interface, which is out of my league I'm afraid!
     
    Last edited: Feb 28, 2010
  7. k7elp60

    Senior Member

    Nov 4, 2008
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    The NTE2061 is a direct replacement for the MM5316 and are available from Mouser electronics. If you want build a clock with the NTE2061, I would be happy to send you a schematic for a clock. I have built several with that IC
     
  8. daviddeakin

    Thread Starter Active Member

    Aug 6, 2009
    207
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    Thanks for the pointer! Annoyingly this chip is harder to obatin here in Britian, although I could get hold of it if I run out of alternatives. I would like to see the schem though! mallorynichols ATT hotmal DOT co DOT uk

    Going back to the PCF8563, does anyone know what deivce would serve as the master receiver (as shown in the block diagram on page 20)? http://www.farnell.com/datasheets/60445.pdf
     
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