Datasheet-style PDF for the 24LC21 family serial EEPROM, with the I_P suffix in the name likely pointing to an industrial-temperature or PDIP package variant, though the…

A 312 KB PDF covering the 24LC21 serial EEPROM, with the -1 suffix probably marking a separate edition or part one of the documentation.

PDF reference for the 24LC21A, the revised version of the dual-mode DDC serial EEPROM commonly found in monitors and display boards for holding EDID information.

PDF documentation, 716 KB, for the 24LC21 dual-mode 1 Kbit serial EEPROM, a chip widely used for EDID storage in displays.