Key facts
- Brand
- Atmel
- Model
- ATtiny25
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-04
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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 specifications
| 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 |
Source: ATMEL - Features High Performance Low Power AVR 8-Bit Microcontroller Advanced RISC Architecture 120
All Atmel ATtiny25 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 flash memory sizes are available for the ATtiny25/45/85?
The device offers 2 KB, 4 KB, or 8 KB of in‑system programmable flash memory.
From: ATMEL - Features High Performance Low Power AVR 8-Bit Microcontroller Advanced RISC Architecture 120
What voltage ranges does the ATtiny25/45/85 support?
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.
From: ATMEL - Features High Performance Low Power AVR 8-Bit Microcontroller Advanced RISC Architecture 120
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