I MIGHT have some ICL7109s. I designed them into a product about 20 years
ago and may still have some. Let me know if you want me to look for them.

Harold


> I can identify with that challenge. :o(  I have a product still in the
> field
> that uses an ICL7109 A/D converter. Some customers keep their products as
> long as they are working and it is good will to keep supporting them.  I
> have made some pluggable daughter boards on occasion, and sent them off
> for
> the customer to plug them in, in place of a chip, because the customer did
> not want to upgrade. I suppose I could have said "have to upgrade."  But I
> would not feel comfortable with that. You are fortunate to still find the
> 7490.
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of
> TOMTOM
> Sent: Friday, June 30, 2006 12:56 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Where have all the 7490's gone?
>
> One of the reasons why the 7490 has become obsolete (scarce if you prefer)
> is because they are a high current, high heat device compared with the
> newer
> technology (CMOS, etc.).  The 74LS Series is an improvement in speed but
> still relatively high current and heat.  Many designers are considering
> low
> voltage devices as a result of the increased demand for portable, battery
> powered stuff.  I would thing that newer designs for production quantities
> would consider alternatives to the 74xx or 74LSxx devices.  That being
> said,
> it is just MHO.
>
> ----- Original Message -----
> From: "PicDude" <picdude@narwani.net>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Sent: Friday, June 30, 2006 1:45 AM
> Subject: Re: [EE] Where have all the 7490's gone?
>
>
>> Nice resource -- thanks.
>> -Neil.
>>
>>
>> On Wednesday 28 June 2006 17:51, Harold Hallikainen wrote:
>>> I'm finding them at various places in LS and HC. Try
>>> http://www.findchips.com .
>>>
>>> Harold
>>>
>>> > Why have all the 74xx90's (decade counters) disappeared suddenly?  My
>>> > usual
>>> > sources (Digikey & Mouser) are claiming that they're
>>> > discontinued/obsolete.
>>> > Anyone know where I can get just 10-12 of these in SOIC packaging?
>>> > Have
>>> > some
>>> > PCB's already made from over a year ago that I need these for, so
>>> it's
>>> > not a
>>> > simple matter of choosing a different part.
>>> >
>>> > Cheers,
>>> > -Neil.
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