Atmel ATTINY45-20PU is tiny little 8pin DIP microcontroller, packed with high performance, low power 8 bit Advanced RISC Architecture. Its operational Voltage limit is 2.7V to 5.5V. It has 20 MHz CPU Clock, 6 general purpose I/O lines, 4KB ISP flash memory, 256B EEPROM, 256-Byte SRAM. It has 2 timers, 4 PWM Channel and 4 Channel 10-bit ADC inputs. Operational Temperature range of this microcontroller is -40 to 85 degree C.