This is the Atmel AVR ATtiny85-20PU microcontroller, a favorite of DIYers who need a small and efficient microcontroller.
- Controller family: ATtiny
- Embedded interfaces: I2C, SPI
- Number of IOs: 6
- Program memory size: 8KB
- RAM memory size: 512B
- Number of pins: 8
- CPU speed: 20MHz
- Supply voltage: 2.7 to 5.5VDC
The datasheet is available from Atmel.