ATTINY85-20SI

Overview

The ATTINY85-20SI is an 8-bit AVR microcontroller manufactured by Microchip Technology, housed in an 8-lead EIAJ SOIC package. It features 8 KB of In-System Programmable Flash memory, 512 bytes of EEPROM, and 512 bytes of SRAM. The device supports a maximum clock frequency of 20 MHz when operating within the 4.5V to 5.5V supply range, and up to 10 MHz between 2.7V and 5.5V. It includes six programmable I/O lines, a 10-bit ADC with four single-ended channels, and operates across an industrial temperature range of -40°C to +85°C.

Feature Summary

• High-performance 8-bit AVR architecture executing most instructions in a single clock cycle
• Non-volatile memory with 10,000 write/erase cycles for Flash and 100,000 for EEPROM
• Integrated Universal Serial Interface (USI) supporting SPI and I2C compatible modes
• On-chip debug system (debugWIRE) and multiple power-saving operational modes

Applications

• In-system programming via SPI serial interface
• Industrial embedded control systems requiring wide voltage tolerance
• Battery-powered devices utilizing low-power idle and power-down modes

Procurement Notes

Verify that the ordering suffix 'SI' corresponds specifically to the 8-lead EIAJ SOIC package configuration as defined in official manufacturer documentation. Confirm the speed grade matches the required operational frequency for your specific supply voltage conditions. Ensure compliance with RoHS directives if lead-free packaging is mandated for your assembly process.

Selection Notes

Select this component when 8 KB of program memory is required alongside a compact surface-mount footprint. The 20 MHz speed grade is suitable for applications needing higher processing throughput at voltages above 4.5V. Consider alternative packages such as PDIP or SU if through-hole mounting or different reel packaging is preferred.

Part Context

This device belongs to the ATtiny family of 8-bit microcontrollers based on the AVR enhanced RISC architecture. It shares core specifications with the ATtiny25 and ATtiny45 models, differentiated primarily by its larger Flash, EEPROM, and SRAM capacities. The series is designed for cost-sensitive applications requiring efficient code execution and low power consumption.

Replacement Considerations

ATtiny85-20SU offers identical electrical characteristics but utilizes a standard SOIC package rather than the EIAJ variant. ATtiny85-20PU provides the same performance in a through-hole PDIP package. Verify pin compatibility and physical dimensions before substituting.