24CS256T-E/ST

Memory IC Overview

The Microchip Technology 24CS256T-E/ST is a 256-Kbit (32K x 8) 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 industrial temperatures from -40°C to +125°C. The device includes a 1-Kbit Security Register containing 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

• Integrated 128-bit factory-programmed serial number for unique device identification
• Built-in Error Correction Code (ECC) logic for improved read reliability
• Enhanced software write protection allowing independent locking of eight memory zones
• Backward compatible with legacy 24AA256/24LC256/24FC256 devices

Memory IC Applications

• Automotive systems requiring AEC-Q100 qualified nonvolatile storage
• Industrial equipment needing high-reliability data logging
• Consumer electronics utilizing serialized component tracking
• IoT devices requiring secure configuration parameter storage

Memory IC Procurement Notes

Verify the specific suffix 'T-E/ST' corresponds to the TSSOP-8 package and Extended temperature grade (-40°C to +125°C). Confirm that the 'T' indicates tape and reel packaging if required by automated assembly lines. Ensure the ordering part number matches the exact datasheet revision DS20005998D to guarantee compatibility with the documented electrical characteristics and pinout definitions.

Memory IC Selection Notes

Select this component when application requirements demand High-Speed I2C communication at 3.4 MHz alongside robust data integrity features. The inclusion of ECC and a dedicated Security Register makes it suitable for applications requiring unique serialization and protected configuration data. Choose this variant over standard versions if extended temperature operation or specific automotive qualification standards are mandatory for the system design.

Memory IC Part Context

This device belongs to the 24CS256 family of serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 24LC256 but adds advanced security and speed features. The 'T' suffix denotes tape and reel packaging, while 'ST' specifies the 8-lead Thin Shrink Small Outline Package (TSSOP). The 'E' indicates the extended temperature rating, distinguishing it from industrial-only variants.

Memory IC Replacement Considerations

The 24CS256 is backward compatible with the 24LC256, 24AA256, and AT24C256C. However, direct replacement requires verifying that the host controller supports the 3.4 MHz High-Speed mode and the specific I2C addressing sequences for the Security and Configuration registers. Software modifications may be necessary to utilize the enhanced write protection and ECC features.