AT49F002NT-70JC

Memory IC Overview

The AT49F002NT-70JC is a 5-volt-only in-system reprogrammable Flash memory with a capacity of 2 megabits (256K x 8). It features a 70 ns access time and operates within a commercial temperature range of 0°C to 70°C. The device utilizes a parallel interface and is housed in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package.

Memory IC Feature Summary

• Sector architecture includes one 16K byte boot block with programming lockout, two 8K byte parameter blocks, and two main memory blocks.
• Hardware data protection prevents inadvertent programming through VCC sense, program inhibit, and noise filtering.
• Internal program control and timer manage erase cycles without requiring external clocks.

Memory IC Applications

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

Memory IC Procurement Notes

Verify the manufacturer origin as Atmel Corporation for this specific part number. Confirm the package type corresponds to the 32-lead PLCC variant indicated by the 'J' suffix. Ensure the operating temperature range matches the commercial specification required for the application environment.

Memory IC Selection Notes

Select this component when a 5-volt supply is available and parallel flash memory is required. The 70 ns speed rating suits applications needing moderate read performance. Consider the sector layout if distinct regions for boot code and user data are necessary.

Memory IC Part Context

This device belongs to the AT49F002 family of 5-volt Flash memories. It shares architectural similarities with other variants differing primarily in access speed and package style. The NT designation indicates a TSOP or similar thin profile option, while JC specifies the PLCC package.

Memory IC Replacement Considerations

AT49F002NT-55JC

Memory IC FAQ

How is the boot block programming lockout feature enabled?

The lockout feature is activated by executing a specific six-program command sequence to designated addresses with particular data patterns.

What method detects the end of a program cycle?

DATA polling can be used, where reading the last programmed byte yields its complement until the cycle completes.