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Just curious, how big is the actual piece of wafer inside a Propeller DIP? — Parallax Forums

Just curious, how big is the actual piece of wafer inside a Propeller DIP?

Oldbitcollector (Jeff)Oldbitcollector (Jeff) Posts: 8,091
edited 2012-08-29 17:18 in Propeller 1
For some reason, this occurred to me today. Would a cut-down 24pin DIP be possible?

(See attached)

Jeff
propeller_dip_cut.jpg
propeller_dip_cut.jpg
458 x 279 - 25K

Comments

  • Heater.Heater. Posts: 21,230
    edited 2012-08-28 21:51
    No idea how big the chip is but my bet is that you could take a hacksaw to the DIP Prop and remove 6 pins from the tail end and still have a working Prop.
  • cgraceycgracey Posts: 14,255
    edited 2012-08-28 22:01
    The die is 7.3mm x 7.3mm, as I recall.
  • Tracy AllenTracy Allen Posts: 6,664
    edited 2012-08-28 22:03
    From Chip, Propeller-Die-Photo, square, 7.28mm on a side.
  • Roger LeeRoger Lee Posts: 339
    edited 2012-08-28 22:06
    Jeff, be careful with the saw.
    When you get back from the shop: Where are you going with this? :lol:


    Btw: like the new part number. Missed that at first glance.
  • Dr_AculaDr_Acula Posts: 5,484
    edited 2012-08-28 23:20
    Right now, Jeff will be measuring from the center of the chip half of 7.3mm and you know, I can hear sawing in the workshop...
  • TubularTubular Posts: 4,706
    edited 2012-08-28 23:32
    Yeah it's certainly a nice big rainbow colored thing, as I found out using the mill. Here's the thread
    http://forums.parallax.com/showthread.php?134596-Lobotomized-Prop

    You could certainly cut it down, but need the I2C boot pins. Also you can get 0.6" to 0.3" width converters, so something like a DIP-24s with 16 GPIO could me made (losing P8-23)

    and the result...

    attachment.php?attachmentid=85313&d=1316653089
  • SRLMSRLM Posts: 5,045
    edited 2012-08-28 23:33
    If Parallax offered a Propeller Die poster, I'd buy it. (and T-Shirts, and mugs, and ... , and ...)
  • pedwardpedward Posts: 1,642
    edited 2012-08-28 23:46
    I counted the pins in Tubular's photo, and it's possible to make a DIP-24 version without disturbing the die. For safety, just make sure the border is the same on the cut side as the notch.

    It's fortuitous that the VSS and VDD pins line up where they do!
  • PaulPaul Posts: 263
    edited 2012-08-29 05:33
    I posted something similar a couple years ago. Probably not practical for a production system.

    40 pin dip.jpg

    Propeller24_Chip.JPG


    (Yes, it's gimped.)
    40 pin dip.jpg
    350 x 281 - 20K
    Propeller24_Chip.JPG
    679 x 326 - 37K
  • PublisonPublison Posts: 12,366
    edited 2012-08-29 06:11
    Oldbitcollector (Jeff) wrote: »
    Would a cut-down 24pin DIP be possible?

    Yes! They can be found at your friendly Parallax Store :)
  • ctwardellctwardell Posts: 1,716
    edited 2012-08-29 07:10
    Considering that the same die would be used, there would be very little cost advantage, so I'm not sure I see why it would really be needed.

    If space is the concern you can go smaller using the other packages and still have full pinout.

    C.W.
  • Invent-O-DocInvent-O-Doc Posts: 768
    edited 2012-08-29 07:28
    It might be more expensive, but there is the SPIN STAMP....
  • Duane C. JohnsonDuane C. Johnson Posts: 955
    edited 2012-08-29 07:35
    Paul wrote: »
    I posted something similar a couple years ago. Probably not practical for a production system.

    40 pin dip.jpg

    Propeller24_Chip.JPG


    (Yes, it's gimped.)

    But did it run?

    Duane J
  • PublisonPublison Posts: 12,366
    edited 2012-08-29 09:36
    Invent-O-Doc wrote: »
    It might be more expensive, but there is the SPIN STAMP....

    Doc..see post #11 :)
  • Martin HodgeMartin Hodge Posts: 1,246
    edited 2012-08-29 11:41
    Thinking about buying 10,000 dies from Parallax and having them custom packaged? ;)
  • PublisonPublison Posts: 12,366
    edited 2012-08-29 17:18
    Martin Hodge wrote: »
    Thinking about buying 10,000 dies from Parallax and having them custom packaged? ;)

    10,000 PDIP's in a "Hello Kitty" motif would sell like hotcakes! :)
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