This datasheet describes the features and characteristics of the ATtiny25/45/85 series of high performance, low power AVR® 8-bit microcontrollers.
The ATtiny25/45/85 is a low‑power CMOS 8‑bit microcontroller based on Atmel's AVR enhanced RISC architecture. It offers 2 KB, 4 KB or 8 KB of in‑system programmable flash, up to 512 B of EEPROM, 512 B of SRAM, six programmable I/O lines, multiple timers, a 10‑bit ADC, and various low‑power modes.
The device is available in 8‑pin PDIP, 8‑pin SOIC and 20‑pad QFN/MLF packages and operates from 1.8 V to 5.5 V. Detailed pin‑out diagrams, block diagrams, and register descriptions are provided, along with typical electrical characteristics such as active mode current of 300 nA at 1 MHz, 1.8 V.
| Flash program memory | 2 KB / 4 KB / 8 KB |
|---|---|
| EEPROM size | 128 B / 256 B / 512 B |
| SRAM size | 128 B / 256 B / 512 B |
| Operating voltage | 1.8 V – 5.5 V (ATtiny25/45/85V), 2.7 V – 5.5 V (ATtiny25/45/85) |
| Maximum clock speed | 0‑4 MHz @ 1.8‑5.5 V, 0‑10 MHz @ 2.7‑5.5 V, 0‑20 MHz @ 4.5‑5.5 V |
| I/O pins | 6 programmable I/O lines |
| Timer/Counter | 8‑bit Timer/Counter with Prescaler and Two PWM Channels |
| ADC | 10‑bit ADC, 4 single‑ended channels, 2 differential pairs |
| Package options | 8‑pin PDIP, 8‑pin SOIC, 20‑pad QFN/MLF |
| Active mode current (1 MHz, 1.8 V) | 300 nA |
| Power‑down mode current (1.8 V) | 0.1 µA |
The device offers 2 KB, 4 KB, or 8 KB of in‑system programmable flash memory.
It operates from 1.8 V to 5.5 V for the ATtiny25/45/85V version and from 2.7 V to 5.5 V for the standard ATtiny25/45/85.
The microcontroller provides six programmable I/O lines.
The active mode current is 300 nA.