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Old 7th Jun 2021, 8:57 am   #1
Ricardo
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Default 34024PC 14-Pin DIL IC

I am working to restore a FT101E transceiver which has been in storage for many years and the 34024PC frequency counter / divider IC in the marker / calibrator circuit seems to be faulty. [3.2 MHz input, correct supplies, but no 100kHz or 25khz outputs]

Does anyone have a spare one of these ICs stashed away somewhere that I could buy or any ideas where I could obtain one?


Regards,

Richard
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Old 7th Jun 2021, 9:41 am   #2
John_BS
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Default Re: 34024PC 14-Pin DIL IC

Could you use a CD4024b by cross plugging pins or similar?

John
NB seller in France offering them on ebay?

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Old 7th Jun 2021, 11:22 am   #3
Chrispy57
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Default Re: 34024PC 14-Pin DIL IC

https://www.ebay.co.uk/itm/192472730...sAAOSwWxNYndVK

from France, 9.50 inc postage if you're desperate?
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Old 7th Jun 2021, 1:07 pm   #4
Ricardo
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Default Re: 34024PC 14-Pin DIL IC

Thanks for the replies.

John, It looks to me as if the CD4024B has the same pin-out - just going by the Yaesu documentation. I couldn't seem to find a data-sheet for the 34024PC anywhere. From a CD4024B datasheet it looks as though with a 9V supply it should work with a 3.2 MHz input. So it might be worth trying one as a substitute. They are certainly more readily available and cheaper than the 34024PC.

Chispy57, Thanks for the link. I will bear that french supplier in mind if the CD4024B isn't a suitable replacement for some reason and I can't find the 34024PC more cheaply elsewhere.

Regards,

Richard
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Old 7th Jun 2021, 2:39 pm   #5
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Default Re: 34024PC 14-Pin DIL IC

They replicated the functionality of the 4000 CMOS family along with pinouts so you'll also find the 74HC4024 a possibility. It's much faster than the original CD4000 family, BUT it's not for power supplies over 5v

It's one way out if you hit speed problems with CD4000 logic, but you lose the wide range power supply voltage feature.

74HC4046 is handy for use as a phase detector. It's VCO is awful, just don't even think of using it!

David
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Old 7th Jun 2021, 4:00 pm   #6
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Default Re: 34024PC 14-Pin DIL IC

This data sheet explains the Fairchild 30000 series CMOS variant to the 4000 CMOS series.

Dave
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Old 8th Jun 2021, 9:19 am   #7
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Default Re: 34024PC 14-Pin DIL IC

According to the Fairchild 1975 catalogue, 34024 is specified to clock at up to 30MHz with a 10V supply. Clock to Q output delay is 37ns.

Rich
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Old 8th Jun 2021, 9:55 am   #8
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Default Re: 34024PC 14-Pin DIL IC

Texas data-sheet states 3.5MHz max at 5V Vcc. So you should be OK?

John
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Old 8th Jun 2021, 12:31 pm   #9
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Default Re: 34024PC 14-Pin DIL IC

In the PB-1547 module the supply for that IC is running from a 9.1V Zener, so a 5V unit will not work.

Regards, Peter
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Old 8th Jun 2021, 1:36 pm   #10
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Default Re: 34024PC 14-Pin DIL IC

Quote:
5V unit will not work.

No, these are CMOS counters with 5 to 15V Vcc. They're slowest on 5V.

John
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Old 8th Jun 2021, 3:18 pm   #11
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Default Re: 34024PC 14-Pin DIL IC

Philips/NXP HEF4024BP claims to operate at 13(min)~25MHz (typical) at 10V but is no longer manufactured. Might be able to find NOS.

Texas Instruments CD4024BE appears to be cross referenced to HEF4024BP. A few vendors state a maximum operating frequency of 24MHz but do not provide other operating condition criteria.

Rich
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Old 9th Jun 2021, 6:21 am   #12
Ricardo
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Default Re: 34024PC 14-Pin DIL IC

Thanks for all the information and suggestions. As John has said the IC needs to operate from a 9V supply. I have ordered a 4024B CMOS IC and will fit it in a DIL socket. So if it doesn't work as expected for some reason I can more easily swap it out for a higher spec' part.

Regards,

Richard
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Old 12th Jun 2021, 7:15 am   #13
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Default Re: 34024PC 14-Pin DIL IC

I am pleased to say that a CD4024B works perfectly well in this application.

Mods, as far as I am concerned this wanted thread can now be closed.

Regards,

Richard
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