AT49F516-70VI

Memory IC Overview

The AT49F516-70VI is a 5-volt only in-system programmable and erasable Flash Memory manufactured by Atmel. It provides 512K of memory organized as 32,768 words by 16 bits. The device features a fast read access time of 70 ns and operates within an industrial temperature range of -40°C to +85°C. It utilizes a 44-Lead Plastic J-Leaded Chip Carrier (PLCC) package. Key specifications include a typical word programming time of 10 µs per word, a maximum erase cycle time of 10 seconds, and support for up to 10,000 write cycles.

Memory IC Feature Summary

• Supports single voltage operation with 5V read and reprogramming capabilities.
• Includes an internal program control and timer for automated operations.
• Features an 8K word boot block with optional hardware lockout protection.
• Provides data polling and toggle bit mechanisms for end-of-cycle detection.

Memory IC Applications

• In-system programmable code storage
• Boot block secure code retention
• Nonvolatile data storage requiring word-by-word programming

Memory IC Procurement Notes

Verify the manufacturer designation, as this component was originally produced by Atmel before its acquisition by Microchip Technology. Confirm the specific suffix 'VI' corresponds to the 70 ns speed grade and the Industrial (-40°C to +85°C) operating temperature range. Ensure the PLCC-44 package type matches the design requirements. Cross-reference the ordering code against current distributor catalogs to confirm availability and exact datasheet revision alignment.

Memory IC Selection Notes

Select this component when a 512K x 16-bit Flash memory architecture is required for applications needing in-system reprogrammability without high voltage generation. The 70 ns access time suits moderate-speed embedded systems. Consider the 8K word boot block feature if secure system startup code protection is necessary. Verify that the 5V-only power supply constraint aligns with the target system's voltage rails.

Memory IC Part Context

This part belongs to the AT49F516 series of 5-volt Flash memories. It is functionally similar to other devices in the family but distinguished by its 70 ns access speed and industrial temperature rating. The 'VI' suffix specifically denotes the speed bin and temperature range within the broader product line.

Memory IC Replacement Considerations

Compatible substitutes include AT49F516-55VI for faster access or AT49F516-90VI for relaxed timing requirements, provided the package and pinout remain identical. Other 512K x 16-bit 5V Flash memories may require logic level translation or timing adjustments.

Memory IC FAQ

How is the boot block lockout feature enabled?

The lockout is enabled by executing a specific six-command sequence involving writing AA to address 5555H, 55 to 2AAA H, 80 to 5555H, followed by another AA/55 pair, and finally 40 to 5555H.

What indicates the end of a program cycle?

The end of a program cycle can be detected via Data Polling, where I/O7 outputs the complement of the loaded data, or via the Toggle Bit on I/O6, which stops toggling once the cycle completes.