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Vlasta
Joined: 15 May 2012
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 Posted: Tue Oct 30, 2012 3:54 am Post subject: Excited..... [PHOTOS ADDED] |
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I bought something on impulse and I think I have something amazing - no it is not a 4004 wafer but it is OLD. I bought a bunch of wafers off a guy and also a wafer template mask. I have just got the wafers today and will let you guys have pics and notes as I get them under my microscope - there are about 90 or so 4" wafers with dies and also ONE 3" wafer with dies.
The wafer mask template is in a box and is approximately 4" x 4" with an active mask area of about 3 4/16" x 3 4/16" and the box is marked.... well look at the photo.......anyone know about this item at all and care to speculate what it might be a mask of?
And yes the date reads September 21st 1977!!!
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Steve
Last edited by Vlasta on Wed Oct 31, 2012 5:12 am; edited 1 time in total |
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Robev
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Vlasta
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| Posted: Tue Oct 30, 2012 4:09 am Post subject: |
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Based on what number?
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Steve |
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Robev
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| Posted: Tue Oct 30, 2012 4:10 am Post subject: |
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| Vlasta wrote: |
Based on what number? |
the part number
see above the second option may be a better guess
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Vlasta
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| Posted: Tue Oct 30, 2012 4:16 am Post subject: |
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Rob maybe I am being a bit thick but which part number on the mask box led you to the two options above? I suppose 1977 vintage it is no longer available?
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Robev
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| Posted: Tue Oct 30, 2012 4:18 am Post subject: |
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23701
but my guess is pure speculation
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Last edited by Robev on Tue Oct 30, 2012 4:23 am; edited 1 time in total |
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Vlasta
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| Posted: Tue Oct 30, 2012 4:22 am Post subject: |
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oh yeah.... missed that one. I will get it under my microscope later on and see what I can see - the wafers - lots of different ones.
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Vlasta
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| Posted: Tue Oct 30, 2012 4:25 am Post subject: |
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How come the prototype mask is dated 1977 though?
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Robev
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| Posted: Tue Oct 30, 2012 4:34 am Post subject: |
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| Vlasta wrote: | | How come the prototype mask is dated 1977 though? |
Good point, as I said my guess was pure speculation and I missed the date on the pdf
However I do think it is a TI mask
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Vlasta
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| Posted: Tue Oct 30, 2012 4:38 am Post subject: |
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I will get some microscope shots tonight and see if we can solve the conundrum
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Steve |
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Robev
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| Posted: Tue Oct 30, 2012 4:48 am Post subject: |
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Here is another possibility
SNJ54LS253J
found after a search for 908B and dates back to 1972 originally
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Vlasta
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| Posted: Tue Oct 30, 2012 4:53 am Post subject: |
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How do you get the date?
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Robev
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| Posted: Tue Oct 30, 2012 4:56 am Post subject: |
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| Vlasta wrote: | | How do you get the date? |
download the pdf (6 Pages) and read it
Top of Page states "SDLS147 – SEPTEMBER 1972 – REVISED MARCH 1988"
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Last edited by Robev on Tue Oct 30, 2012 4:59 am; edited 1 time in total |
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Vlasta
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| Posted: Tue Oct 30, 2012 4:58 am Post subject: |
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ya ya ya - you have more time than I do - stuck here in the office....
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Robev
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| Posted: Tue Oct 30, 2012 4:59 am Post subject: |
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| Vlasta wrote: | | ya ya ya - you have more time than I do - stuck here in the office.... |
see above
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