M28W640ECB90N6

Memory IC Overview

The M28W640ECB is a 64 Mbit (4 Mbit x 16) non-volatile Flash memory featuring a bottom boot block architecture. It operates with a core supply voltage of 2.7V to 3.6V and an I/O supply of 1.65V to 3.6V, supporting optional 12V fast programming. The device provides access times of 70, 85, 90, or 100 ns and includes Common Flash Interface support. It consists of eight 4 KWord parameter blocks and 127 32 KWord main blocks, offering hardware protection, block locking, and a unique device identifier.

Memory IC Feature Summary

• Asymmetrical blocked architecture with parameter blocks located at the bottom address space for secure boot applications.
• Instant individual block locking scheme allowing any combination of blocks to be locked or unlocked without latency.
• On-chip Program/Erase Controller manages timings and verifies execution of program and erase commands.
• Supports program and erase suspend operations to allow reading data from other blocks during ongoing operations.

Memory IC Applications

• Secure boot code storage in embedded systems requiring bottom-starting firmware.
• Industrial control systems needing robust hardware write protection.
• Automotive electronics utilizing high endurance and reliability standards.
• Consumer devices requiring flexible data logging and configuration storage.

Memory IC Procurement Notes

Verify the specific access time suffix required for your design, as the base model supports multiple speeds. Confirm package availability matches your PCB layout needs, typically TSOP48 or TFBGA48. Ensure the VPP pin handling aligns with your system's power sequencing to enable fast programming features if utilized. Check for RoHS compliance status relevant to your manufacturing region requirements.

Memory IC Selection Notes

Select this component when a bottom boot block configuration is mandatory for the application's memory map. Consider the 100,000 cycle endurance rating against the expected write frequency of the target system. Evaluate the need for the optional 12V VPP supply; omitting it simplifies power design but increases programming time. Ensure the 16-bit data width fits the controller interface constraints of the host processor.

Memory IC Part Context

This part belongs to the M28W640ECT/ECB family of 3V Supply Flash Memories from STMicroelectronics. It shares architectural similarities with the top-boot variant (M28W640ECT), differing primarily in the location of the parameter blocks. The family utilizes a CMOS technology optimized for low power consumption and high density within the 64 Mbit capacity class.

Memory IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with existing board layouts and software drivers before considering alternative sources or updated revisions from the manufacturer.