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IC Info
- 04-10-2005
- Martin, VK2UMJ
April 10, 2005, 7:46 am

Looking for the pinout details for an obsolete (?) IC - MC14410, DTMF
encoder (Motorola I believe). Yes, I've tried Google and several datasheet
sites, with no luck. I only need the pin designations not the whole
datasheet, so if anyone can help by posting the info it'd be much
appreciated.
Also, anyone know what DTMF encoder/generator chips are out there these
days? I've looked in WES and Jaycar cats for several of the common IC's but
the 14410 seems to be the only one listed in WES, and it needs a 1MHz xtal
rather than the 3.5795MHz commonly available and used by the other
encoders....
TIA

Re: IC Info
On Sun, 10 Apr 2005 17:46:51 +1000, "Martin, VK2UMJ"

In the common variety stuff there is the 8870 decoder and the 8880
encoder/decoder using 3.579MHz. Consumer Microcircuits (CML) do some
exotic units, aimed at the two way radio market, that will handel
DTMF.
I just bought some surface mount 8870s - beware though the MOQ was 840
ICs! It looks as if Farnell and RS both do the 8870 but not the 8880.
Alan
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Re: IC Info
On Sun, 10 Apr 2005 21:08:34 +1000, "Martin, VK2UMJ"

How many encoders are you after??
I have some PCB's with Sharp LR4087B encoders on them (and a 3.579MHz
xtal). If you only need one let me know and I will stick one in the
post for you with a diagram. The board already functions as a
generator and has a 5v reg on it as well.
Alan
Contact details in sig below
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Jenal Communications
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Jenal Communications
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Re: IC Info

Thanks, but it seems these ones need a tad more circuitry than some of those
others that have a direct input from a keypad to give a tone out (from what
I could see of the 3312 datasheet)...
Trying to keep things very simple and inexpensive, hence the desire (if
possible) to use an encoder chip that has the row/column direct input from a
DTMF type keypad, and also uses the commonly available 3.5795MHz xtal...
Cheers

Re: IC Info

datasheet
but
http://www.holtek.com.tw/english/products/comm_3.htm
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId10%001&catalogId10%001&productId11%7089
http://www.freescale.com/files/timing_interconnect_access/doc/data_sheet/MC145740.pdf
http://www.datasheetarchive.com/search.php?search=tone+dialer&sType=desc
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