24CS256-E/SN

Memory IC Overview

The Microchip Technology 24CS256-E/SN is a 256-Kbit (32,768 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 Industrial temperature grades from -40°C to +85°C. The device includes a 1-Kbit Security Register containing a factory-programmed 128-bit serial number and user-programmable 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 up to 1 MHz and High-Speed mode up to 3.4 MHz with output slope control.
• Integrated 1-Kbit Security Register providing a unique 128-bit factory-programmed serial number and lockable user identification pages.
• Built-in Error Correction Code (ECC) logic capable of correcting single-bit errors within four-byte readouts for improved data integrity.
• Flexible data protection mechanisms including hardware write-protect via the WP pin and enhanced software-based zone protection.

Memory IC Applications

• Automotive systems requiring AEC-Q100 qualified nonvolatile memory storage
• Industrial applications needing reliable data logging with high endurance
• Consumer electronics utilizing serialized product identification

Memory IC Procurement Notes

Verify that the suffix 'SN' corresponds to the SOIC package variant as specified in the datasheet documentation. Confirm the 'E' designation indicates the Extended temperature grade (-40°C to +125°C) if required by your specific application environment, distinct from the standard Industrial grade. Ensure compatibility with your system's I²C bus voltage levels and pull-up resistor requirements for the selected operating frequency.

Memory IC Selection Notes

Select this component when high-speed data transfer rates up to 3.4 MHz are necessary alongside robust security features. The inclusion of ECC makes it suitable for environments where data corruption risks are elevated. Consider the 8-lead SOIC package for surface mount assembly constraints. Evaluate the need for the extended temperature range indicated by the 'E' suffix against your operational thermal profile requirements.

Memory IC Part Context

This device belongs to the 24CS series of Serial EEPROMs, which are designed for applications demanding enhanced security and reliability compared to standard variants. It maintains backward compatibility with legacy 24AA/24LC/24FC families while adding advanced features like the Security Register and ECC. The series is widely used in automotive and industrial sectors where persistent storage and device authentication are critical.

Memory IC Replacement Considerations

The datasheet confirms backward compatibility with the 24AA256, 24LC256, 24FC256, and AT24C256C serial EEPROMs. When substituting these parts, verify that the target application can accommodate the 24CS256's specific I²C addressing sequences and configuration register requirements, particularly regarding the Enhanced Software Write Protection mode.