24LCS21A-I/P

Memory IC Overview

The Microchip Technology 24LCS21A-I/P is a 1K-bit (128 x 8) dual-mode Electrically Erasable PROM designed for monitor identification and configuration storage. It operates on a single supply voltage ranging from 2.5V to 5.5V. The device features a 2-wire I²C-compatible serial interface supporting up to 400 kHz clock frequency at 5V, and implements the DDC1/DDC2 interface standard. It includes hardware write protection, a page-write buffer for eight bytes, and ensures 1,000,000 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 Transmit-Only mode
• Supports bidirectional I²C communication and unidirectional Transmit-Only mode using separate clock inputs
• Features flexible hardware write protection via dedicated pin and internal control fuse
• Utilizes low-power CMOS technology with typical standby current of 10 μA at 5.5V

Memory IC Applications

• Monitor identification and EDID storage in display systems
• Configuration and control information storage requiring serial transmission
• Dual-mode memory applications needing transition between transmit-only and bidirectional protocols

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) as specified in the datasheet. Confirm the package type 'P' indicates an 8-lead Plastic DIP. Ensure compatibility with system voltage levels within the 2.5V to 5.5V operating range. Check for RoHS compliance status if required by assembly specifications.

Memory IC Selection Notes

Select this component when DDC compliance is required for display interfaces. Choose the PDIP package for through-hole mounting requirements. Consider the dual-mode capability if the application necessitates switching between continuous transmission and standard I²C read/write operations. Verify that the 128-byte memory depth meets the specific data storage needs.

Memory IC Part Context

The 24LCS21A belongs to the 24LCS series of dual-mode I²C serial EEPROMs manufactured by Microchip Technology. It is specifically engineered to comply with VESA Display Data Channel standards. The device serves as a bridge between traditional serial EEPROM functionality and specialized display identification protocols, offering flexibility in system design.

Memory IC Replacement Considerations

The 24LCS21 is noted as not recommended for new designs; the 24LCS21A is the designated replacement. Verify pinout compatibility and electrical characteristics before substitution. Ensure the substitute supports the same dual-mode operation and DDC standards.