8kBytes of In-System Self-Programmable Flash, 512 Bytes In-System Programmable EEPROM, 512 Bytes Internal SRAM. Two 8-bit timer/counters with PWM and prescaler, 10-bit ADC, I2C Interface, and debugWIRE for on-chip-debug. Up to 20 MIPS throughput at 20 MHz with an external oscillator. 1.8 – 5.5 V operation, 1.8V logic level available with an oscillator at 4MHz or below. Half the flash (4KB) version: ATtiny45 2KB version: ATtiny25

Specifications:

Program Memory Size – 8kB
RAM Size – 512B
Number of I /O – 6
Package / Case – 8-DIP (0.300″, 7.62mm)
Speed – 10MHz
Oscillator Type – Internal
Program Memory Type – Flash
EEPROM Size – 512B
Core Processor – AVR
Data Converters – A/D 4 (10 bit resolution)
Core Size – 8-Bit
Operating Temperature – -40°C ~ 85°C
Connectivity – USI
Peripherals – Brown-out Detect/Reset, POR, PWM, WDT
Voltage – Supply (Vcc/Vdd) – 1.8 V ~ 5.5 V

Cross-relation:

• pin and feature compatible with tiny25, more memory.
• pin and feature compatible with tiny45, more memory.