AT49F002NT-90JI

Memory IC Overview

The AT49F002NT-90JI is a 5-volt only in-system reprogrammable Flash memory with a capacity of 2 megabits (256K x 8). It features a 90 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 Thin Small Outline Package (TSOP) measuring 8 x 20 mm. Active current consumption is 50 mA, while CMOS standby current is 100 µA.

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 via VCC sense, program inhibit, and noise filtering.
• Internal program control and timer manage erase and program cycles without external clocks.
• DATA polling and toggle bit features allow detection of the end of program or erase cycles.

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 products are now part of Microchip Technology. Confirm the package type matches the TSOP specification and ensure the operating temperature range aligns with commercial requirements. Check for specific ordering suffixes that may indicate variations in testing or packaging standards.

Memory IC Selection Notes

Select this component for designs requiring 5V-only operation and sector-based memory organization. The industrial grade variant (-JI) supports a wider temperature range compared to commercial options. Ensure system voltage stability above 3.8V to prevent program inhibition during operation.

Memory IC Part Context

This device belongs to the AT49F002 family of 2-megabit Flash memories. It shares architectural similarities with other variants like the AT49LV002 but differs in supply voltage requirements. The 'N' suffix indicates the presence of a RESET pin, distinguishing it from non-reset versions.

Memory IC Replacement Considerations

AT49F002NT-70JI

Memory IC FAQ

How is the boot block programming lockout feature enabled?

The feature is enabled by executing a six-command sequence involving specific address locations and data patterns, which permanently locks the boot block against programming at input voltages of 5.5V or less.

What is the function of the RESET pin on the AT49F002NT?

The RESET pin halts device operations and places outputs in a high impedance state when low. Applying 12V to this pin allows overriding the boot block programming lockout.