M28W320FCB70ZB6E

Memory IC Overview

The M28W320FCB70ZB6E is a 32Mbit (2Mb x16) parallel NOR flash memory manufactured by Micron Technology Inc. It features a 70ns access time and operates on a 3V supply with VDD ranging from 2.7V to 3.6V and VDDQ from 1.65V to 3.6V. The device utilizes a TFBGA47 package measuring 6.39mm x 6.37mm with a 0.75mm pitch. It employs an asymmetrical block architecture with parameter blocks located at the bottom of the address space, supporting hardware write protection and boot block locking.

Memory IC Feature Summary

• Supports instant individual block locking with three levels of protection to prevent accidental programming or erasure.
• Includes a Protection Register containing a unique 64-bit device identifier and 128-bit user-programmable OTP cells.
• Features asynchronous parallel interface enabling chip-in-execution (XiP) for direct code execution.

Memory IC Applications

• Industrial control systems requiring reliable firmware storage
• Communication equipment needing robust boot code retention
• Embedded applications utilizing bottom-boot-block architectures

Memory IC Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance status and check for obsolete part status notifications. Ensure voltage requirements match system design specifications before integration.

Memory IC Selection Notes

Select this model when a bottom-aligned boot block configuration is required for system startup. Consider the TFBGA47 package constraints for PCB layout. Verify compatibility with existing parallel NOR flash controllers regarding timing and command set support.

Memory IC Part Context

This component belongs to the M28W320 family of 32Mbit parallel NOR flash memories. It shares architectural similarities with the M28W320FCT variant but differs in parameter block placement. The device represents legacy technology from the Numonyx/Micron portfolio designed for high-reliability embedded storage.

Memory IC Replacement Considerations

Direct pin-compatible replacements may include other M28W320 variants with different access speeds or packages. Verify electrical characteristics and command set compatibility before substitution.

Memory IC FAQ

What is the difference between M28W320FCT and M28W320FCB?

The primary difference is the location of the parameter blocks. M28W320FCT places them at the top of the address space, while M28W320FCB locates them at the bottom.

How does the Write Protect (WP) pin function?

When WP is low, Lock-Down is enabled, preventing changes to the block protection status. When high, Lock-Down is disabled, allowing blocks to be locked or unlocked.