On: The world's smallest ARM chip announced, designed for swallowable computers

[microtherion]

They do, more or less.

http://www.atmel.com/devices/ATtiny1634.aspx

[Kliment → microtherion]

None of those come in a package nearly as small.

[microtherion → Kliment]

The data sheet claims that the ATtiny1634-UUR is 2.38x2.02mm, which to me does not seem all that much larger than the chips under discussion.

[Kliment → microtherion]

Ah, you are entirely correct. I didn't see the -U in the listing on Atmel's site, but it is indeed in the datasheet. The ball layout is a pain to route though, 0.4mm pitch.