[SI-LIST] Re: IC package

  • From: Dav0 Lieby <dav0x@xxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Tue, 17 Aug 2004 10:07:17 -0700 (PDT)

At one point someone was selling modified
DRAMs in clear packages as image sensors.

> Another reason for black (or other photo opaque
> color) other than clear 
> is that ambient light shining on the die can have
> 'unintended 
> consequences' . I remember a couple cases a long
> time ago where in one 
> instance ambient light shining through the 'erase'
> window on an EPROM 
> somehow changed timing enough to crash a system
> (covering the window 
> with black tape restored normal functionality). In
> another case 120Hz 
> noise was modulated onto some driver outputs in a
> de-lidded chip we were 
> working on in the lab. Shielding the die from the
> ambient fluorescent 
> lighting made the 120Hz nose on the outputs go away.
> -Ray

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