ATTINY861-20SU

Overview

The ATTINY861-20SU is an 8-bit AVR microcontroller featuring 8K bytes of In-System Programmable Flash, 512 bytes of EEPROM, and 512 bytes of SRAM. It operates at a maximum clock frequency of 20 MHz when powered between 4.5V and 5.5V, or up to 10 MHz across the 2.7V to 5.5V range. The device utilizes a 20-pin SOIC package and includes 16 programmable I/O lines. Key peripherals comprise an 11-channel 10-bit ADC, two timers/counters, and a Universal Serial Interface.

Feature Summary

• Executes most instructions in a single clock cycle using an advanced RISC architecture with 32 general-purpose working registers.
• Supports In-System Programming via SPI for Flash and EEPROM reprogramming without external programming hardware.
• Integrates multiple power-saving modes including Idle, ADC Noise Reduction, Standby, and Power-Down to optimize energy consumption.

Applications

• Battery-powered sensor nodes requiring low active current consumption
• Industrial control systems utilizing the industrial temperature range
• General-purpose embedded logic controllers

Procurement Notes

Verify the specific speed grade suffix against the required operating voltage and frequency constraints. Confirm the package type matches the PCB footprint requirements. Check the manufacturing lifecycle status as availability may be limited for mature products. Ensure the datasheet revision aligns with the design specifications.

Selection Notes

Select this component for applications needing 8KB program memory and high-speed processing up to 20MHz at 5.5V. Consider the ATtiny861V variant if operation below 2.7V is required, noting its lower maximum frequency limit. Evaluate the thermal performance within the SOIC package for the intended ambient conditions.

Part Context

This part belongs to the ATtinyx61 family of 8-bit AVR microcontrollers manufactured by Microchip Technology. The family shares a common core architecture and peripheral set, differentiated primarily by memory sizes and package options. The 'SU' suffix denotes the 20-pin Small Outline Integrated Circuit (SOIC) package configuration.

Replacement Considerations

Direct pin-compatible substitutes within the same series include the ATtiny461-20SU and ATtiny261-20SU, which offer reduced memory capacities. Cross-series replacements require verification of register compatibility and pin mapping.