ATtiny85 – AVR 8 Pin (20MHz 8K)

Atmel’s itty-bitty ATtiny85 8-Bit Processor. 8K of program space, 6 I/O lines, and 4-channel 10 bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit.

Atmel ATtiny85 Datasheet