ATTINY44A-SSU

Overview

The ATTINY44A-SSU is an 8-bit AVR microcontroller featuring 4K bytes of In-System Programmable Flash, 256 bytes of EEPROM, and 256 bytes of SRAM. It operates within a voltage range of 1.8V to 5.5V with speed grades up to 20 MHz at 4.5V–5.5V. The device includes one 8-bit and one 16-bit Timer/Counter with PWM channels, a 10-bit ADC with differential inputs, and an on-chip analog comparator. It utilizes a 14-pin SOIC package and supports industrial temperature ranges.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Integrated non-volatile memory segments with high endurance ratings for Flash and EEPROM data retention.
• Comprehensive peripheral set including dual timer/counters, programmable watchdog, and universal serial interface.
• Low power consumption capabilities with multiple software-selectable sleep modes.

Applications

• Battery-powered embedded systems requiring low active current draw
• Industrial control interfaces utilizing the universal serial interface
• Sensor monitoring applications leveraging the 10-bit ADC and analog comparator

Procurement Notes

Verify the specific speed grade suffix matches the required operating frequency for the target supply voltage. Confirm the SSU packaging designation corresponds to the 14-pin SOIC form factor. Ensure the component meets the industrial temperature range specifications if deployed in harsh environments. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Selection Notes

Select this model when 4K Flash capacity is sufficient for application code. Choose over the ATtiny24A variant if additional I/O lines or memory are needed. Consider the ATtiny84A if larger program storage is required. Verify that the 14-pin SOIC footprint aligns with the PCB layout constraints. Ensure the voltage regulator provides stable output within the 1.8V to 5.5V operational window.

Part Context

This component belongs to the ATtiny24A/44A/84A family of 8-bit AVR microcontrollers. It shares the same core architecture and peripheral features as its siblings, differing primarily in memory sizes. The family is designed for cost-sensitive applications requiring efficient processing and low power operation. All variants support in-system programming via SPI.

Replacement Considerations

Direct substitutes include other ATtiny44A variants with different package options such as PDIP or QFN. Cross-family replacements like ATmega48PA offer more resources but require design adjustments. Verify pin compatibility and firmware compatibility before substituting with older ATtiny44 models lacking the 'A' suffix enhancements.