24CS256T-E/ST66KVAO

Memory IC Overview

The Microchip Technology 24CS256T-E/ST66KVAO 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 lockable ID pages. Built-in Error Correction Code (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 identification storage
• Built-in Error Correction Code (ECC) logic for improved read reliability
• Configurable write protection via hardware pin or software-controlled independent memory zones

Memory IC Applications

• Automotive systems requiring AEC-Q100 qualified nonvolatile memory
• Industrial applications needing reliable data logging and configuration storage
• Consumer electronics utilizing product serialization and secure identification
• Embedded controllers requiring high-speed data access with low power consumption

Memory IC Procurement Notes

Verify the specific suffix 'ST66KVAO' against official Microchip documentation to confirm the TSSOP-8 package, automotive qualification status, and tape-and-reel packaging format. Ensure compatibility with system voltage levels and I²C bus speed requirements before integration. Cross-reference the datasheet revision date to confirm current manufacturing specifications and environmental compliance details.

Memory IC Selection Notes

Select this component when application requirements demand high-speed I²C data transfer rates alongside robust security features such as unique device serialization. The extended temperature rating and automotive qualification make it suitable for harsh environments. Consider the built-in ECC and flexible write protection schemes if data integrity and anti-tampering measures are critical design constraints.

Memory IC Part Context

This part belongs to the 24CS256 family of serial EEPROMs designed for applications requiring secure, nonvolatile data storage. It is backward compatible with legacy 24AA256, 24LC256, and AT24C256 devices, facilitating easier upgrades in existing designs. The inclusion of manufacturer identification functions allows for automated inventory management and device verification during production.

Memory IC Replacement Considerations

Direct substitutes include the 24CS256-I/ST and 24CS256-E/ST for industrial and extended temperature variants respectively. Legacy compatible parts like the 24LC256 or 24AA256 may function but lack the advanced security register and high-speed mode capabilities.