This page is intended to show the outline of the chip and to provide additional information that might not be clear from the data sheet.
Read the generic info about Xtiny and MEGAX.
The ATMEGA808 comes in different casings. It has 8KB of flash and a maximum of 32 pins.
The ATMEGA809 has more pins : 40 and 48
VQFN/TQFP 32