AT49F002N-70JC

Memory IC Overview

The AT49F002N-70JC is a 5-volt only in-system reprogrammable Flash memory manufactured by Microchip Technology. It provides 2 megabits of storage organized as 262,144 words by 8 bits. The device features a fast read access time of 70 ns and operates within the commercial temperature range of 0°C to 70°C. It utilizes a sector architecture including one 16K byte boot block with programming lockout capability, two 8K byte parameter blocks, and two main memory blocks. The component supports hardware data protection and DATA polling for end-of-program detection.

Memory IC Feature Summary

• Supports single-voltage 5V operation for both reading and reprogramming without requiring high input voltages.
• Features a dedicated 16K byte boot block that can be permanently locked out against programming to ensure secure code integrity.
• Includes hardware data protection mechanisms such as VCC sense inhibition and noise filters to prevent inadvertent writes.
• Provides internal program control and timers, allowing for autonomous erase and programming cycles.

Memory IC Applications

• In-system reprogrammable nonvolatile storage
• Secure system boot code storage
• Embedded firmware storage

Memory IC Procurement Notes

Verify the specific package type (PLCC, PDIP, TSOP, or VSOP) required for your design, as the 'JC' suffix indicates the PLCC package variant. Confirm the operating temperature range matches your application needs, as this part is rated for commercial temperatures. Ensure compatibility with existing 5V logic levels and check for any obsolete status notices from the manufacturer.

Memory IC Selection Notes

Select this component when a 2-megabit capacity NOR Flash memory is required for applications needing in-system reprogrammability. It is suitable for designs where a protected boot block is necessary to safeguard critical startup code. Consider the 70 ns access speed and 5V-only power supply requirements during system architecture planning.

Memory IC Part Context

This component belongs to the AT49F002 series of 5-volt Flash memories originally developed by Atmel, which was acquired by Microchip Technology. The series offers various access speeds and package options to accommodate different performance and form factor requirements in embedded systems.

Memory IC Replacement Considerations

AT49F002-70JC

Memory IC FAQ

How is the boot block programming lockout feature enabled?

The lockout feature is enabled by executing a specific six-command sequence involving loading data AA to address 5555, data 55 to address 2AAA, data 80 to address 5555, data AA to address 5555, data 55 to address 2AAA, and finally data 40 to address 5555.

What happens if the RESET pin is pulled to 12 volts?

Applying 12 volts to the RESET pin overrides the boot block programming lockout feature, allowing the protected boot block data to be altered through chip erase, sector erase, or word programming.