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JingleJoe
Joined: Nov 10, 2011
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Location: Lancashire, England
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 Posted: Tue May 08, 2012 2:01 pm Post subject:
Seeking other frequency divider / binary counter chips |
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I'm aware of the 4040, 4020, 4060 and even 4024 which all count in binary or divide the input clock frequency by half each step.
However I am looking for a frequency divider IC with multiple clock inputs and only a few divisions for each one, 3 is plenty. I'm thinking, if there's one clock input and 3 outputs you could fit 3 separate counters/dividers in a standard 14 pin IC. Does anyone know if such an IC exists? Or anything similar?
I don't want to go wasting a whole 4040 you see, for just three or four outputs. I've got cost and board space in mind too.
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richardc64
Joined: Jun 01, 2006
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Location: NYC
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| Posted: Tue May 08, 2012 3:46 pm Post subject:
Re: Seeking other frequency divider / binary counter chips |
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The CD4520 is very nice. It contains two synchronous 4-bit binary counters, each with clk, enable and reset. Clock and enable are somewhat interchangeable, effectively being two clk inputs of opposite polarities.
The similar 4518 is decimal. Its first stage The first stage of each counter is a divide-by-2.
| JingleJoe wrote: | | I'm thinking, if there's one clock input and 3 outputs you could fit 3 separate counters/dividers in a standard 14 pin IC. Does anyone know if such an IC exists? Or anything similar? |
Only obscure and over-priced electronic organ ICs. http://www.organservice.com/crm/topdividers.htm#Fig14
Edit: Clarified 4518 detail.
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Last edited by richardc64 on Wed May 09, 2012 5:19 am; edited 1 time in total |
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JingleJoe
Joined: Nov 10, 2011
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| Posted: Wed May 09, 2012 5:11 am Post subject:
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The CD4520 looks perfect!  But my usual supplier doesn't have any  I may have to resort to Rapid and their extortionate postage charges.
Those old organ chips look very interesting, I'd love to play with some but they are just too expensive/rare 
EDIT: neither my usual supplier, spiratronics, or Rapid have the 4520 Anyone got any they would like to sell me?
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PHOBoS
Joined: Jan 14, 2010
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| Posted: Wed May 09, 2012 8:43 am Post subject:
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You could also use some flipflops (which is what's usually inside those divider chips) but it'll probably not really reduce the chip count.
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mrmrshoes
Joined: Feb 19, 2011
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JingleJoe
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| Posted: Wed May 09, 2012 2:38 pm Post subject:
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I thought about using flip flops phobos, but like you said, increases the chipcount 
Thankyou mrmrmshoes  I may buy from them if I can't get any at my local electronics shop.
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JingleJoe
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| Posted: Thu May 10, 2012 6:19 am Post subject:
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Spiffing! My electronics shop had them in stock  They look about 30 years old though I love that place.
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Psyingo
Joined: Jun 11, 2009
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| Posted: Sat May 12, 2012 8:39 am Post subject:
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| JingleJoe wrote: | | Spiffing! My electronics shop had them in stock They look about 30 years old though I love that place. |
The older they are, the warmer the tone. |
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JingleJoe
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| Posted: Sat May 12, 2012 10:59 am Post subject:
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| Psyingo wrote: | | JingleJoe wrote: | | Spiffing! My electronics shop had them in stock They look about 30 years old though I love that place. |
The older they are, the warmer the tone. |
I sense an air of sarcasm there They are logic chips anyway, I don't know how "warm" they can be
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bubzy
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| Posted: Sun May 13, 2012 1:08 am Post subject:
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| Quote: | | I don't know how "warm" they can be |
love this quote.
try 18volts through one, they can get pretty warm.
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JingleJoe
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| Posted: Sun May 13, 2012 2:58 pm Post subject:
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| bubzy wrote: | | Quote: | | I don't know how "warm" they can be |
love this quote.
try 18volts through one, they can get pretty warm. |
Oh I've been there, but with a 74 TTL; it didn't like more than 5 volts at all my fingers have hard skin from all the burns, admittedly 99% from soldering but 1% are from hot chips
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