24LCS21A/P

Memory IC Overview

The Microchip Technology 24LCS21A/P is a 1 Kbit (128 x 8-bit) 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 and features a 2-wire I2C-compatible serial interface. The device supports two operational modes: Transmit-Only mode, which continuously outputs memory data clocked by the VCLK pin, and Bidirectional mode, allowing standard read/write access via SCL and SDA pins. It includes hardware write protection, page-write buffering 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 interfaces for monitor identification with automatic recovery to DDC1
• Supports bidirectional I2C communication and unidirectional transmit-only operation
• Includes hardware write-protect pin and flexible software-based array locking
• Features 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
• Dual-mode serial EEPROM applications requiring DDC compliance

Memory IC Procurement Notes

Verify that the ordering suffix 'P' corresponds to the 8-lead Plastic DIP package as specified in the datasheet. Confirm the temperature range designation matches the required industrial specifications. Ensure compatibility with the system's voltage levels and I2C bus requirements before integration.

Memory IC Selection Notes

Select this component when DDC1/DDC2 compliance is required for display applications. It is suitable for designs needing dual-mode operation between continuous transmission and standard I2C control. Consider the PDIP package availability if through-hole mounting is necessary for the specific PCB layout constraints.

Memory IC Part Context

The 24LCS21A belongs to Microchip's 24LCS series of dual-mode I2C serial EEPROMs. It is specifically engineered to meet VESA Display Data Channel standards. The '/P' suffix indicates the 8-lead Plastic DIP package variant, distinguishing it from surface-mount options like the SOIC package.

Memory IC Replacement Considerations

Public documentation notes that the 24LCS21 is not recommended for new designs and suggests using the 24LCS21A instead. Verify functional equivalence if substituting older revisions or similar capacity devices within the same product family.