fungus:
john1993:
its true that a 14pin dip CHIP is bigger than a 32pin qfp CHIP but to imagine a 14pin dip BOARD would be bigger than a promini is ridiculous. specially considering the pin duplication, unnecessary parts, and wasted space from the sparkfun moron designer of promini. bringing out 14 pins to headers would end up much smaller than promini even with the single cap, crystal, and led circuit required. it looks like somebody has never bothered to actually measure either device or even glanced at the mechanicals.bringing out 14 pins will always take a fraction that of bringing out 28 regardless of chip package all else equal.
Did you bother to look at the picture I posted?
Even if you take the Tiny84's 14 pins directly to the edge of the PCB you still can't make a PCB which is exactly 7 holes long. You need to make it longer for the other components + connectors.
(nb. I guess you could make it double sided...but that still increases the overall volume)
Other than folks who like to produce simple PCB's as an end to themselves (as your example indicates) when putting together a PCB for a chip, what matters is the area that chip takes. The purpose of the board includes all of the other items that are needed to implement that purpose. So if you need a tiny to satisfy those needs what matters is the relative space for the tiny compared to the other possibility you are proposing, the pro micro--which as I demonstrated takes at least 3 times the board space and potentially much higher if one works with SMD's and board space is tight.
For the tiny, in many cases the only additional components REQUIRED is a resister to hold the reset pin high and a set of six pads for programming. Both of which can be placed inside the same footprint as the chip itself if so desired. And that can be done without adding volume, since as I have explained the six pads DO NOT require soldered pin headers in order to be useful. Indeed, even hobbyists can (and should get away from populating those headers by using something like this; SparkFun ISP Pogo Adapter v2 - KIT-23451 - SparkFun Electronics which can be purchased or put together at home if one wishes...