Key facts
- Brand
- Atmel
- Model
- ATtiny25/V, ATtiny45/V, ATtiny85/V
- Category
- microcontrollers
- Industry
- Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2026-10-17
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ATMEL ATtiny25/V * ATtiny45/V ATtiny85/V * * Preliminary handbook
The ATtiny25/45/85 is a low‑power CMOS 8‑bit microcontroller based on Atmel's enhanced RISC AVR architecture. It offers 2/4/8 KB of flash, up to 512 B of EEPROM, 512 B of SRAM, six programmable I/O lines, a 10‑bit ADC, and multiple timer/counter modules, making it suitable for compact, power‑sensitive designs.
This handbook details the device's features, pin‑out diagrams for PDIP, SOIC and QFN/MLF packages, CPU core architecture, register set, and programming guidelines. It also includes code examples, resource links, and reliability information such as data‑retention and endurance specifications.
Atmel ATtiny25/V, ATtiny45/V, ATtiny85/V specifications
| Program Memory Flash | 2/4/8K Bytes |
|---|---|
| EEPROM | 128/256/512 Bytes |
| Internal SRAM | 128/256/512 Bytes |
| Operating Voltage (V) | 1.8 - 5.5V |
| Operating Voltage (V) | 2.7 - 5.5V |
| Speed Grade (V) | 0 - 4 MHz |
| Speed Grade (V) | 0 - 10 MHz |
| Speed Grade (V) | 0 - 20 MHz |
| Active Mode Current | 300 µA |
| Power-down Mode Current | 0.1 µA |
Source: Atmel ATtiny25/45/85 Datasheet
All Atmel ATtiny25/V, ATtiny45/V, ATtiny85/V documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the endurance of the Flash memory?
The Flash memory has an endurance of 10,000 Write/Erase Cycles.
What is the endurance of the EEPROM?
The EEPROM has an endurance of 100,000 Write/Erase Cycles.
What is the operating voltage range for the ATtiny25/45/85?
The device 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 ATtiny25/45/85 version.
From: ATMEL ATtiny25/V * ATtiny45/V ATtiny85/V * * Preliminary handbook
How much flash memory is available on the ATtiny25/45/85?
The microcontroller provides 2 KB, 4 KB, or 8 KB of in‑system programmable flash memory.
From: ATMEL ATtiny25/V * ATtiny45/V ATtiny85/V * * Preliminary handbook