ATTINY45-20SH

Overview

The ATtiny45-20SH is an 8-bit AVR microcontroller featuring a high-performance RISC architecture. It includes 4K bytes of In-System Programmable Flash, 512 bytes of EEPROM, and 256 bytes of SRAM. The device operates at maximum clock frequencies up to 20 MHz when powered between 4.5V and 5.5V, or up to 10 MHz across the 2.7V to 5.5V range. It provides six programmable I/O lines, a 10-bit ADC with four single-ended channels, and two PWM outputs.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for efficient processing.
• Non-volatile memory systems including ISP Flash, EEPROM, and internal SRAM with specified endurance ratings.
• Integrated peripheral suite comprising timers, counters, universal serial interface, and analog-to-digital conversion capabilities.
• Multiple software-selectable power-saving modes designed to minimize energy consumption during operation.

Applications

• Battery-powered embedded systems requiring low active and standby current consumption.
• Simple control applications utilizing the integrated analog comparator and temperature measurement features.
• Cost-sensitive consumer electronics leveraging the compact package and extensive instruction set.

Procurement Notes

Verify that the ordering suffix 'SH' corresponds to the specific 8-pin SOIC package variant within the ATtiny45 family. Confirm the speed grade matches the required operational frequency for your voltage supply conditions. Ensure the component meets the industrial temperature range specifications if operating in extreme environments. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Selection Notes

Select this component when 4K bytes of program memory and 256 bytes of RAM are sufficient for the application logic. Choose the ATtiny45 over the ATtiny25 if additional memory resources are needed, or over the ATtiny85 if cost and pin count are primary constraints. Consider the 20MHz speed grade only if the system operates reliably at 4.5V to 5.5V. Evaluate the 8-pin SOIC package suitability for surface mount assembly processes.

Part Context

This part belongs to the ATtiny25/45/85 series of 8-bit AVR microcontrollers manufactured by Microchip Technology (formerly Atmel). The series shares a common core architecture and peripheral set, differentiated primarily by memory sizes and available package options. The ATtiny45 serves as the mid-range option in terms of storage capacity within this specific low-pin-count family.

Replacement Considerations

ATtiny45-20SU

FAQ

What is the maximum operating frequency at 2.7V?

At a supply voltage of 2.7V, the maximum operating frequency is 10 MHz.

How many general purpose I/O lines does the ATtiny45 provide?

The device provides six programmable I/O lines accessible via Port B.