In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kgracey wrote:

Dave,

Creating and qualifying a new package requires a significant investment of time and money, so it would take a substantial commitment from a customer for us to add a new package. One of the challenges from our standpoint is that the SX20/28 die is one part, so it costs us the same to package up an 18 or 28-pin part (okay, it's about two cents less). The market expectation is that lower pins costs less, but in our case (being fabless) it's not true. 

For your small space needs with the SX28, I'd use the SX28AC/SS Proto Board. You get a small SX chip, power supply, proto area, resonator and SX-Key socket in a nice package for less than $10. We made these specifically for customers like yourself. 

There may already exist an adapter for the SX48 to fit into a 10x10 pin grid array. This wouldn't be too small, though. 

We're always doing our best with the SX line to accommodate both hobbyists and commercial users. This is why the tools are cheap (and will get cheaper in another month or two) and the Proto Boards are also affordable.

Ken Gracey
Parallax, Inc.

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