[sdiy] Another new hard to find part....

[Colin Hinz]

On Mon, 5 Jul 2004, Ingo Debus wrote:

> Am Montag, 05.07.04 um 06:59 Uhr schrieb James Patchell:
>
> > Recreating the 74HC283 with "discrete" circuitry, while an interesting
> > exercise, would be problematic...i.e...way too many parts.  I could
> > recreate the functionality with a CPLD, like say a Xilinx XC9536
>
> The 74283 could probably be recreated with a "simple" PLD like the
> 22V10 too. I haven't investigated if it's really possible, perhaps it's
> necessary to generate the "internal carry" with an extra product term,
> so the PLD would probably be slower than the original. Of course it's
> not pin-compatible, since the 74283 has 16 pins.
> Isn't there even a "in-system-programmable" version of the 22V10
> available that requires no programming hardware?

Yes, it's the isp22V10, made by Lattice Semiconductor. It has 4 more
pins than a regular 22V10, for the ISP interface.

I used their parts *religiously* for a few years in the mid-1990s,
but a change in projects, and then employers, means that I haven't
laid eyes on the parts in nearly 5 years.

- Colin Hinz
  Toronto, Canada