Why does the Prop come in a fat PDIP instead of a narrow PDIP?

Rayman

Anybody know?· I think I would greatly prefer a narrow PDIP body...· I think I read that the silicon is 1 mm^2, so I think it would fit..

parts-man73

I'm not sure that I've ever seen a narrow 40 pin DIP.

I'm sure someone will immediately post a picture of some obscure chip to prove me wrong but.....

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Brian

uController.com - home of SpinStudio

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Rayman

I guess that explains it, such a thing doesn't exist... Maybe it's a mechanical problem with something that long...

Phil Pilgrim (PhiPi)

Besides that, I think the die is too big to fit in a 0.300" wide package.

-Phil

kittmaster

As a semiconductor engineer, typically when you have that many connections to the die, the bond wires become very unrully. It would be very difficult to have a narrow package with that many bond wires in any type of narrow package config.

Also the die gets larger as well and most likely won't sit in a narrow carrier properly. Even 28 pin devices tend to expand in width, like 32's etc etc

Beau Schwabe

Phil is correct...

The current Propeller die is·almost 6mm square or .42inches ... it would be physically impossible to use a .3 inch dip


kittmaster,

I've seen that many connections on a single chip in a .3 inch, but special tooling was required, since the die was actually oriented 45 deg inside the DIP package.· It's not common.







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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Post Edited (Beau Schwabe (Parallax)) : 12/8/2007 3:27:46 AM GMT

mosquito56

noobs alive and well thanx

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Mosquito: An animal which buzzes in your ear and never stops.