This part is a kind of semiconductor called 93LC66.

Function of this product has 1K/2K/4K 2.0V Microwire Serial EEPROM.

Manufacturers : Microchip Technology

Image and pinout :

Some of the text within the PDF file :

Not recommended for new designs – Please use 93LC46C, 93LC56C or 93LC66C. 93LC46/56/66 1K/2K/4K 2.5V Microwire Serial EEPROM Features: • Single supply with programming operation down to 2.5V • Low-power CMOS technology • 100 µA typical active read current at 2.5V • 3 µA typical standby current at 2.5V • ORG pin selectable memory configuration • 128 x 8- or 64 x 16-bit organization (93LC46) • 256 x 8- or 128 x 16-bit organization (93LC56) • 512 x 8 or 256 x 16 bit organization (93LC66) • Self-timed erase and write cycles (including auto-erase) • Automatic ERAL before WRAL • Power on/off data protection circuitry • Industry standard 3-wire serial I/O • Device status signal during erase/write cycles • Sequential read function • 1,000,000 E/W cycles ensur [ ... ]

93LC66 PDF Datasheet Download