24LCS21AT/SN

Memory IC Overview

The Microchip Technology 24LCS21AT/SN is a 1Kb (128 x 8-bit) dual-mode Electrically Erasable PROM housed in an 8-pin SOIC package. It operates on a single supply voltage ranging from 2.5V to 5.5V and supports I2C-compatible serial interfaces with clock frequencies up to 400 kHz at 5V and 100 kHz at 2.5V. The device features hardware write protection, a page-write buffer for eight bytes, and ensures over one million erase/write cycles with data retention exceeding 200 years.

Memory IC Feature Summary

• Implements DDC1/DDC2 interface standards for monitor identification with automatic recovery to DDC1 mode
• Supports dual operational modes: Transmit-Only for continuous memory streaming and Bidirectional for standard I2C read/write access
• Includes flexible hardware write-protection capabilities via dedicated pins and internal control fuses

Memory IC Applications

• Monitor identification and configuration storage
• Display Data Channel (DDC) applications
• Storage of system configuration and control information

Memory IC Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging when ordering. Confirm the 'I' designation matches the required industrial temperature range of -40°C to +85°C. Ensure the 'SN' suffix corresponds to the 8-lead Plastic SOIC package format. Cross-reference the full part number against the manufacturer's current datasheet revision to confirm active status and any recent manufacturing changes.

Memory IC Selection Notes

Select this component for designs requiring strict compliance with VESA Display Data Channel standards. It is suitable for applications needing both unidirectional EDID transmission and bidirectional configuration updates. Consider the low standby current and robust ESD protection for reliable operation in noisy environments. Verify that the available pinout and package dimensions fit the target PCB layout constraints.

Memory IC Part Context

This device belongs to the 24LCS21A family of dual-mode serial EEPROMs designed specifically for display industry applications. It serves as a non-volatile memory solution for storing Extended Display Identification Data (EDID). The series provides a bridge between traditional I2C memory interfaces and specialized display communication protocols.

Memory IC Replacement Considerations

The 24LC21AT/I/SN is a similar I2C EEPROM but lacks the dual-mode DDC functionality. The 24LCS21A/P offers the same electrical characteristics in a PDIP package. Verify compatibility if substituting packages or removing DDC-specific features.