24LCS21A-I/SNG

Memory IC Overview

The Microchip Technology 24LCS21A-I/SNG is a 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. The device supports two operational modes: Transmit-Only mode, which utilizes the VCLK pin for clocking data out via SDA, and Bidirectional mode, which implements a standard I²C-compatible interface using SCL and SDA pins. It features hardware write protection, a page-write buffer for up to 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 capabilities
• Features low-power CMOS technology with typical standby current of 10 μA at 5.5V
• Includes hardware write-protect pin and flexible write-protection control fuse
• Provides ESD protection greater than 4000V across all pins

Memory IC Applications

• Monitor identification and configuration storage
• Storage of serial transmission configuration information
• Control information storage requiring dual-mode operation

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the industrial temperature range of -40°C to +85°C as specified in the datasheet. Confirm the 'SNG' suffix indicates the 8-lead Plastic SOIC package with lead-free and RoHS compliance. Ensure design requirements align with the specific dual-mode protocol implementation detailed in the functional description section.

Memory IC Selection Notes

Select this component when application logic requires seamless transition between unidirectional EDID transmission and bidirectional I²C communication. The device is suitable for systems needing hardware-enforced write protection and high endurance. Consider the specific timing requirements for VCLK initialization and SCL transition detection during power-up sequences.

Memory IC Part Context

This part belongs to the 24LCS21A series of dual-mode I²C serial EEPROMs manufactured by Microchip Technology. It is designed specifically for applications compliant with VESA Display Data Channel (DDC) standards. The series offers both PDIP and SOIC packaging options to accommodate different board layout constraints while maintaining identical electrical characteristics.

Memory IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.