AT49F001A-45TI

Memory IC Overview

The AT49F001A-45TI is a 5-volt only in-system reprogrammable Flash memory manufactured by Atmel. It provides 1 megabit of storage organized as 131,072 words by 8 bits. The device features a fast read access time of 45 ns and operates within an industrial temperature range of -40°C to +85°C. It utilizes a sector architecture comprising one 16K-byte boot block with programming lockout, two 8K-byte parameter blocks, and two main memory blocks. Byte-by-byte programming typically takes 30 µs per byte, while the full chip erase cycle completes in approximately 3 seconds.

Memory IC Feature Summary

• Supports single-voltage 5V operation for both reading and reprogramming without requiring high input voltages.
• Includes hardware data protection mechanisms such as VCC sense and noise filters to prevent inadvertent programming.
• Features a dedicated 16K-byte boot block that can be permanently locked out against further programming or erasure.

Memory IC Applications

• In-system reprogrammable code storage
• Secure boot code implementation
• Parameter data retention

Memory IC Procurement Notes

Verify the manufacturer origin, as this component was originally produced by Atmel Corporation before its acquisition by Microchip Technology. Confirm the specific package type (TSOP) and speed grade (-45) match the design requirements. Check for availability of legacy components from authorized distributors or surplus markets, as older flash memory parts may have limited production runs.

Memory IC Selection Notes

Select this component when a 5-volt-only interface is required for nonvolatile storage. Ensure the system supports the specific sector architecture and command sequences for erasure and programming. Consider the 45 ns access time for compatibility with the target microprocessor bus speeds. Verify that the physical TSOP package dimensions fit the PCB layout constraints.

Memory IC Part Context

This part belongs to the AT49F001A series of 1-megabit Flash memories. It is functionally similar to other variants like the AT49F001AN but differs in pin configuration, specifically regarding the RESET pin availability. The 'TI' suffix indicates the TSOP package and industrial temperature rating.

Memory IC Replacement Considerations

AT49F001A-45VI

Memory IC FAQ

How is the boot block programming lockout feature enabled?

The lockout feature is enabled by executing a specific six-command software sequence to designated addresses. Once activated, the boot block cannot be erased or programmed with input voltages of 5.5V or less.

What method detects the end of a program cycle?

The device supports DATA polling, where reading the last loaded byte yields its complement during programming. Alternatively, the Toggle Bit on I/O6 toggles between states until the cycle completes.