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fRaSsL
Joined: 31 Mar 2003
Posts: 1570
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 Posted: Sat Jan 10, 2004 12:42 pm Post subject: DEC 4008 - 1973? |
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Hi,
I found this little chip...
Does anyone know, what this is?
Thanks!
Frank |
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mtx500
Joined: 21 Nov 2003
Posts: 117
Location: Nuremberg, Germany
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| Posted: Mon Jan 12, 2004 2:32 am Post subject: Re: DEC 4008 - 1973? |
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| fRaSsL wrote: | I found this little chip...
Does anyone know, what this is? |
I think it is an ordinary logic chip of the 40xx (CMOS) series (TTL series is 74xx). As such, it would be a 4-bit binary full adder with fast carry.
For the Pinout, see the ChipDir entry http://www.xs4all.nl/~ganswijk/chipdir/giicm/4008.txt |
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fRaSsL
Joined: 31 Mar 2003
Posts: 1570
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| Posted: Mon Jan 12, 2004 3:26 am Post subject: |
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| Hehe... I thought the same... but a CMOS chip in 1973??? |
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Elar
Joined: 16 Jul 2003
Posts: 746
Location: Tallinn, Estonia
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| Posted: Mon Jan 12, 2004 2:26 pm Post subject: Re: DEC 4008 - 1973? |
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| mtx500 wrote: |
I think it is an ordinary logic chip of the 40xx (CMOS) series (TTL series is 74xx). As such, it would be a 4-bit binary full adder with fast carry.
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Not likely. Motorola standard CMOS series was 14xxx. |
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fRaSsL
Joined: 31 Mar 2003
Posts: 1570
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| Posted: Mon Jan 12, 2004 3:36 pm Post subject: |
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| Maybe "DEC" stands for decoder? |
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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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| Posted: Mon Jan 12, 2004 5:03 pm Post subject: |
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I can't find any information on this Motorola chip. It's not 4008 as the 4008 is a 16-pin chip, and DEC4008 is a 14-pin chip.
Genna |
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Sun Oct 31, 2004 4:16 am Post subject: |
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It's an 8-bit parity generator made for Digital Equipment Corp. (Same as the MC4008.) It's TTL, not CMOS, BTW - and yes, there were CMOS chips as far back as the late '60s. I have a couple RCA 4000-series CMOS chips in white ceramic DIPs from 1969.
- c.webster |
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Mon Nov 15, 2004 8:16 am Post subject: 4008 |
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I have a Motorola 4005, date code 7011, same package, 14 gold pins and it is a 16 bit memory.
I also have the data sheet to the 4005 somewhere and I am sure that there was a 4008 and 4009 mentioned.
So I'm sure it is any kind of very early memory chip.
When I find the datasheet I will post better information. |
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Tue Nov 16, 2004 8:11 pm Post subject: |
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Nope, it's what I said it is - an 8-bit parity generator. Here's page 1 of the data sheet:
http://home.att.net/~c.and.a/mc4008.gif
BTW, I'm the guy who sold you the four MC4005 RAMs + data sheet.
- c.webster |
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Wed Nov 17, 2004 2:03 am Post subject: okok, you're right |
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Hi, yes, I found the datasheet and I was wrong.
Even without your correction I would have posted this today;-)
But nevertheless nice to meet you here again! |
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Sun Dec 05, 2004 4:09 am Post subject: Re: okok, you're right |
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| wepwawet wrote: | | But nevertheless nice to meet you here again! |
Likewise!
- CMW |
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