AT49F002AT-55JI

Memory IC Overview

The AT49F002AT-55JI is a 5-volt-only in-system reprogrammable Flash memory with a 2-megabit (256K x 8) capacity. It features a 55 ns access time and operates within an industrial temperature range of -40°C to +85°C. The device utilizes a sector architecture comprising one 16K-byte boot block, two 8K-byte parameter blocks, and four main memory blocks. It supports byte-by-byte programming with a typical cycle time of 20 µs and includes hardware data protection mechanisms.

Memory IC Feature Summary

• Sector-based erase architecture with dedicated boot block lockout for secure code storage
• Internal program control and timer eliminating the need for external clocks during operations
• Hardware data protection including VCC sense and noise filtering to prevent inadvertent writes
• DATA polling and toggle bit capabilities for efficient end-of-cycle detection

Memory IC Applications

• In-system reprogrammable firmware storage
• Secure boot code retention
• Industrial embedded systems requiring 5V operation

Memory IC Procurement Notes

Verify the specific suffix 'JI' corresponds to the 32-lead PLCC package and industrial temperature grade (-40°C to +85°C). Confirm that the component is sourced from authorized distributors to ensure authenticity, as this part originates from Atmel's legacy portfolio now managed by Microchip Technology. Check for RoHS compliance status if required for your assembly process.

Memory IC Selection Notes

Select this component when a 5V-only supply is available and parallel interface compatibility is required. It is suitable for applications needing a protected boot sector and moderate write endurance. Consider alternative low-voltage parts if system power budgets are below 3.3V or if higher density is needed.

Memory IC Part Context

This part belongs to the AT49F002A series of 5-volt Flash memories. It shares functional similarities with the AT49LV002 but operates at a fixed 5V supply. The 'T' indicates a TSOP package, while 'J' denotes the PLCC variant. This series was designed for direct EPROM replacement in existing 5V designs.

Memory IC Replacement Considerations

Direct pin-compatible replacements include other AT49F002 variants with different access times or packages. Verify voltage levels carefully when substituting with LV versions, as they require lower supply voltages.