Looking for AVR MCU with internal PLL clock source with more than 8 pins?
There are several AVRs with more than 8 pins, that incorporate the PLL clock multiplier based on the internal RC oscillator. Unfortunately, this is not one of the parameters that can be searched for on the Atmel site. 

There is, however, a work-around:

Search through all the include files (*.h) in your AVRGCC installation folder for the string PLLCSR. The headers for the AVR parts which do have the PLL will show up. After that, you would still need to go through the datasheets of that subset to check for number of pins, and to check for a line like this:


  On chip PLL for fast PWM (32MHz, 48MHz, 64MHz) and CPU (12MHz, 16MHz); PLL source RC &amp; XTAL


On a quick scan, I found the AT90PWM81/161 to meet the requirements, there are several others too.