24CS256T-E/MS66KVAO

Memory IC Overview

The Microchip Technology 24CS256T-E/MS66KVAO is a 256-Kbit (32,768 x 8-bit) serial EEPROM featuring an I²C interface with High-Speed mode support up to 3.4 MHz. It operates within a voltage range of 1.7V to 5.5V and supports extended temperature ranges from -40°C to +125°C. The device includes a Security Register with a factory-programmed 128-bit serial number and user-programmable ID pages. Built-in ECC logic enhances data reliability, while versatile write protection options include hardware WP pin control and enhanced software zone protection.

Memory IC Feature Summary

• High-speed I²C communication supporting standard modes and 3.4 MHz High-Speed operation
• Integrated Security Register containing a unique 128-bit serial number and lockable user identification space
• Built-in Error Correction Code (ECC) logic for improved read reliability
• Configurable write protection allowing full array or individual zone locking via hardware or software

Memory IC Applications

• Automotive systems requiring AEC-Q100 qualified nonvolatile memory
• Industrial applications needing reliable data storage across extended temperature ranges
• Consumer electronics utilizing serialized product identification
• Embedded systems requiring secure configuration data storage

Memory IC Procurement Notes

Verify the specific suffix '66KVAO' against official Microchip documentation to confirm exact packaging, tape-and-reel specifications, and regional availability constraints. Ensure the Extended temperature grade (-40°C to +125°C) matches system requirements. Confirm RoHS compliance status and check for any active engineering change notices affecting this specific ordering variant before finalizing procurement.

Memory IC Selection Notes

Select this component when high-speed I²C data rates up to 3.4 MHz are required alongside robust security features. The built-in ECC and extensive write protection options make it suitable for critical data storage where data integrity is paramount. Ensure the host controller supports the necessary I²C timing parameters for High-Speed mode operation at the target supply voltage.

Memory IC Part Context

This part belongs to the 24CS256 family of serial EEPROMs, designed as a backward-compatible replacement for legacy devices like the 24AA256 and 24LC256. It offers enhanced features such as higher clock speeds, integrated serialization, and advanced software-based write protection compared to earlier generations in the industry-standard I²C EEPROM market.

Memory IC Replacement Considerations

The datasheet confirms backward compatibility with 24AA256, 24LC256, 24FC256, and AT24C256C serial EEPROMs. Verify pinout compatibility and ensure that the host firmware can handle the additional Configuration and Security register commands if migrating from these legacy parts.