24LC21AT/SN

Memory IC Overview

The Microchip Technology 24LC21AT/SN is a 1Kb (128 x 8) dual-mode serial EEPROM 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 interfaces with clock frequencies up to 400 kHz at 5V and 100 kHz at 2.5V. The device features a page write buffer for eight bytes, self-timed write cycles of 10 ms, and access times as fast as 900 ns. Designed for industrial applications, it functions within a temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Implements DDC1/DDC2 interface standards for monitor identification and EDID storage
• Supports dual operation modes: Transmit-Only for continuous data streaming and Bidirectional for standard I2C read/write operations
• Includes hardware write protection via the VCLK pin to prevent unintended memory modifications
• Features low-power CMOS technology with typical standby current consumption of 10 μA

Memory IC Applications

• Monitor identification and EDID configuration storage
• Industrial control systems requiring non-volatile data retention
• Display equipment utilizing Display Data Channel protocols

Memory IC Procurement Notes

Verify that the specific ordering suffix 'T' corresponds to tape-and-reel packaging requirements for your assembly line. Confirm the 'I' designation matches the required industrial temperature range of -40°C to +85°C. Ensure the SOIC package width aligns with your PCB footprint design rules before finalizing procurement orders.

Memory IC Selection Notes

Select this component when both EDID transmission capabilities and standard I2C data logging are required in a single device. The dual-mode architecture allows flexible integration into display systems while maintaining compatibility with standard microcontroller buses. Consider the 8-byte page buffer efficiency for applications involving frequent small data updates.

Memory IC Part Context

This part belongs to the 24LC21A family of 1Kb serial EEPROMs manufactured by Microchip Technology. It serves as a direct replacement for the standard 24LC21, offering enhanced functionality through dual-mode support. The 'SN' suffix indicates surface-mount packaging, distinguishing it from through-hole PDIP variants within the same product series.

Memory IC Replacement Considerations

The 24LC21A is functionally compatible with the legacy 24LC21. Verify that any substitute parts support the specific dual-mode transition logic required for DDC compliance if used in display applications.