24CS256-I/SN

Memory IC Overview

The Microchip Technology 24CS256-I/SN is a 256-Kbit (32,768 x 8) Serial EEPROM featuring a High-Speed I²C interface with support for 3.4 MHz operation. It operates within a voltage range of 1.7V to 5.5V and includes a 1-Kbit Security Register containing a factory-programmed 128-bit serial number and a user-programmable ID page. The device supports up to 1,000,000 write cycles, offers data retention exceeding 200 years, and incorporates built-in Error Correction Code logic. It is available in multiple packages including the 8-Lead SOIC.

Memory IC Feature Summary

• Integrated 128-bit globally unique serial number and lockable user identification page within a dedicated security register.
• Built-in Error Correction Code logic capable of correcting single-bit errors during read operations.
• Versatile data protection options including hardware write-protect pin and enhanced software-based zone protection.
• High-speed I²C interface supporting standard modes up to 1 MHz and high-speed mode up to 3.4 MHz.

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the suffix 'I' corresponds to the Industrial temperature grade (-40°C to +85°C) as specified in the datasheet. Confirm the 'SN' package designation matches the required 8-Lead SOIC form factor. Ensure the specific revision level aligns with your design requirements, as documentation indicates updates to the DS20005998 series.

Memory IC Selection Notes

Select this component when a globally unique identifier is required without manual serialization steps. The built-in ECC provides reliability advantages over standard EEPROMs in noisy environments. Consider the 3.4 MHz capability if system latency constraints demand faster bus throughput compared to legacy 400 kHz devices.

Memory IC Part Context

This part belongs to the 24CS series of Serial EEPROMs, which are distinguished by integrated security features not found in the standard 24LC or 24AA families. It serves as a backward-compatible replacement for devices like the 24LC256 while adding hardware-level security and error correction capabilities essential for modern embedded systems.

Memory IC Replacement Considerations

The datasheet explicitly lists backward compatibility with the 24AA256, 24LC256, 24FC256, and AT24C256C serial EEPROMs. When substituting these parts, verify that the host controller supports the additional Configuration and Security register access sequences required by the 24CS256.

Memory IC FAQ

How does the built-in ECC function?

The device utilizes an Error Correction Code scheme that can correct up to one incorrectly read bit within a four-byte readout. An Error Correction State latch in the Configuration register indicates when ECC has been invoked.

Can the security register be modified after programming?

The first 16 bytes contain a read-only 128-bit serial number. The subsequent 64-byte user-programmable ID page can be permanently write-protected via a specific software sequence, preventing further alterations.