AT49BV040-90VI

Memory IC Overview

The AT49BV040-90VI is a 4-megabit (512K x 8) single-voltage Flash memory manufactured by Microchip Technology. It operates within a voltage range of 2.7V to 3.6V and features a 90 ns access time. The device utilizes a 32-lead TSOP package and supports an industrial operating temperature range from -40°C to +85°C.

Memory IC Feature Summary

• Features a user-enabled boot block protection mechanism that provides write lockout for the lowest order addresses to ensure data integrity.
• Supports byte-by-byte programming with internal program control and timers, eliminating the need for high input voltages during operation.
• Includes hardware data protection mechanisms such as VCC sense inhibition and noise filters to prevent inadvertent programming cycles.

Memory IC Applications

• System firmware storage requiring bottom boot block protection
• Industrial embedded systems operating in wide temperature ranges
• Battery-powered devices utilizing single 2.7V to 3.6V power supplies

Memory IC Procurement Notes

Verify the specific ordering suffix 'VI' corresponds to the 32-lead TSOP package and industrial temperature rating (-40°C to +85°C). Confirm the manufacturer designation on the datasheet, noting historical Atmel branding may appear on legacy documentation. Ensure compatibility with 3-volt-only command sets for read and programming operations.

Memory IC Selection Notes

Select this component when a 4-megabit capacity with a 90 ns access speed is required for industrial environments. The BV series is appropriate for applications needing a lower minimum supply voltage of 2.7V compared to the LV series. Consider the boot block lockout feature if secure code storage at the base address is necessary.

Memory IC Part Context

This part belongs to the AT49BV/LV040 family of 3-volt Flash memories. It shares architectural similarities with the AT49LV040 but differs in its wider voltage tolerance starting at 2.7V. The device is designed for in-system reprogrammability using standard 3-volt logic levels without requiring external high-voltage generators.

Memory IC Replacement Considerations

AT49BV040-90TI

Memory IC FAQ

How is the end of a program cycle detected?

The device supports Data Polling, where reading the last programmed byte yields the complement of the loaded data until completion, and Toggle Bit monitoring on I/O6.

What is the function of the boot block lockout feature?

It permanently protects the 16K byte boot sector (addresses 00000H to 03FFFH) from being erased or programmed once enabled, while allowing updates to the main memory.