AT49LV001-12JI

Memory IC Overview

The AT49LV001-12JI is a 1-megabit (131,072 x 8) parallel Flash memory manufactured by Microchip Technology. It operates on a single 3.0V to 3.6V supply and features a 120 ns access time. The device utilizes a sector architecture comprising one 16-Kbyte boot block with programming lockout, two 8-Kbyte parameter blocks, and two main memory blocks. It supports byte-by-byte programming and includes hardware data protection mechanisms.

Memory IC Feature Summary

• Sector-based erase architecture with dedicated boot block for secure code storage
• Internal program control and timer for automated erase and programming cycles
• Hardware data protection against inadvertent writes via VCC sense and noise filters
• DATA polling and toggle bit capabilities for end-of-cycle detection

Memory IC Applications

• In-system reprogrammable non-volatile storage
• Secure boot code storage with lockout protection
• Parameter storage in industrial systems
• General-purpose firmware storage

Memory IC Procurement Notes

Verify the specific package type associated with the 'JI' suffix, as ordering information indicates 'J' corresponds to PLCC and 'I' denotes Industrial temperature range. Confirm that the datasheet version matches the manufacturing date code. Ensure compatibility with 3.0V to 3.6V supply rails before integration into the design.

Memory IC Selection Notes

Select this component for applications requiring 1-megabit capacity with parallel interface speed of 120 ns. It is suitable for designs needing hardware write protection for critical boot sectors. Compare with AT49BV001 if 2.7V operation is required, or consider higher density parts like AT49LV002 if more storage is needed.

Memory IC Part Context

This part belongs to the AT49BV/LV001 family of 3-volt Flash memories. It shares architectural similarities with the AT49LV002 but offers lower density. The 'LV' designation indicates low voltage operation starting at 3.0V, distinguishing it from the standard BV series which supports 2.7V.

Memory IC Replacement Considerations

AT49LV001-12VI

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, 55, 80, AA, 55, and 40 to addresses 5555, 2AAA, 5555, 5555, 2AAA, and 5555 respectively.

What happens if the RESET pin is pulled high during an erase cycle?

Pulling the RESET pin high halts the current operation and places outputs in a high-impedance state. If done during programming or erasing, the operation may fail and must be repeated after RESET returns to a logic high level.