Older parts - need info

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Mike
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Older parts - need info

Post by Mike » Mon Jun 30, 2003 5:43 pm

I have a bunch of older, I believe, ic's. I have searched google for most of them, with no luck. I was hoping that somebody could help me identify any of the following. I just typed everything that was printed on the chip:<p>1. Seeq 5190017801 8404
2. Motorola MC145152 P1 D8521
3. Motorola 04M43 8417
4. Motorola MC145152 8250
5. 185 04M43 D8321
6. Motorola 27M20 8541
7. Texas Instruments 414 A 51R82609 M33 Taiwan
8. Texas Instruments 7418 SN7474N
9. 71K62 7924
10. 185 M6865 K8313
11. (This one is surface mount) Motorola XC7991OFN 8828 QYAQ8828
12. Motorola 87K26 RQ8140
13. Motorola 04M29 8531<p>If anybody can help me, then thanks. I was just curious about what each of these chips are and what they can do.
Thanks, Mike

naljta
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Re: Older parts - need info

Post by naljta » Mon Jun 30, 2003 6:18 pm

I can help with some of them.<p>TI SN7474, Dual Dtype FlipFlops <p>MC145152-2 : Parallel-Input PLL Frequency Synthesizer<p>Instead of using google try the manufactuers websites<p>TI: www.ti.com
Motorola: www.motorola.com<p>hope this helps. If you can't find the data sheet for the flip flops email me. I have a copy.<p>Nevin

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Re: Older parts - need info

Post by analogee » Mon Jun 30, 2003 7:55 pm

Older, indeed. Most of these numbers include "date codes" which indicate the date of manufacture.<p>For example:<p>1. 8404 => 1984, 4th week.
2. D8521 => 1985, 21st week.
3. 8417 => 1984, 17th week.<p>and so on...<p>It can sometimes be a little hard to tell what is a date code, but generally it is 4 digits (sometimes with a letter in front), and the last 2 digits can't be greater than 52 (or 53, maybe?), since there are 52 weeks in a year.<p>Unfortunately, I can't help with many of the devices, as far as telling you what they are. Looks like #2 and #4 (MC145152) are frequency synthesizers (same parts, different dates of manufacture), which is kind of cool: datasheet for MC145152<p>Hope that helps.<p>Regards,
Todd<p>[ June 30, 2003: Message edited by: analogee ]</p>
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Dean Huster
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Re: Older parts - need info

Post by Dean Huster » Tue Jul 01, 2003 3:36 pm

Trouble is, it's rare to find obsolete devices on a manufacturer's web site. Don't forget that a lot of those numbers might be "house numbers" and are only the vendor's part number and not the device type. Unless you have what is normally company-confidential information, you'll never find out the device's type number.<p>Dean
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Edd
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Re: Older parts - need info

Post by Edd » Tue Jul 01, 2003 7:54 pm

Well the alpha numeric complexity/confusion was shortened a bit by the manuf code dates. I'll throw in the 185 on line items 5 and 10....thats the EIA identifier of RotoMola which the majority of your devices seem to be.
Also on that 68xx Motorola chip if its a larger multipinned device I would suspect it to be an associated support chip to their "6800' series of u/p's back in those days.<p>73's de Edd
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Bernius1
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Re: Older parts - need info

Post by Bernius1 » Wed Jul 02, 2003 4:14 am

Thanks, Ed. The only Moto prefix I have in Qty is
'417'. There's a site , [URL=http://www.d8apro.com] with a Heathkit crossover, and both Heath and Moto use the 417, 442, & 443 prefixes. I strongly suggest printing a copy of the crossover, and READ THE 'CROSS-TO' numbers. I also have an old ECG catalog with crossovers of obsolete parts, and lots o' PINOUTS ! ( ecg992 = LM2900, & CA810 = ECG1115 ).
Let me know if I can help anyone.
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Re: Older parts - need info

Post by Dean Huster » Wed Jul 02, 2003 4:59 am

Aha! The Heathkit numbering is a perfect example of "house numbering". There are some Heathkit chips that have only Heathkit's part number on them even though they may be a relatively common generic part. They commonly did that with memory chips in the trainer kits. The "417-####7" is strictly an in-house Heathkit number and has nothing at all to do with Motorola, which is where d8apro's cross-reference comes in handy. In fact, Motorola probably couldn't even come up with the Heath number if they needed it to save their company from Chapter 11.<p>Dean
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Re: Older parts - need info

Post by KN9TTN » Wed Jul 02, 2003 4:00 pm

If you need help on HEATH KIT house number to
device numbers i might be able to help as
do have some cross ref no guarntees
e mail direct to [email protected]

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Re: Older parts - need info

Post by Calcbert » Wed Jul 02, 2003 6:31 pm

Don't forget to try www.chipdocs.org. You have to pay to get datasheets from them, but they will list the basic description of the chip for free.

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