[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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