This part is a kind of semiconductor called 93C66.

Function of this product has 4096-Bit Serial CMOS EEPROM (MICROWIRE Synchronous Bus).

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

FM93C66 4096-Bit Serial CMOS EEPROM (MICROWIRETM Synchronous Bus) July 2000 FM93C66 4096-Bit Serial CMOS EEPROM (MICROWIRE™ Synchronous Bus) General Description FM93C66 is a 4096-bit CMOS non-volatile EEPROM organized as 256 x 16-bit array. This device features MICROWIRE interface which is a 4-wire serial bus with chipselect (CS), clock (SK), data input (DI) and data output (DO) signals. This interface is compatible to many of standard Microcontrollers and Microprocessors. There are 7 instructions implemented on the FM93C66 for various Read, Write, Erase, and Write Enable/Disable operations. This device is fabricated using Fairchild Semiconductor floating-gate CMOS process for high reliability, high endurance and low power consumption. “LZ” and “L” versions of FM93C66 offer ver [ ... ]

93C66 PDF Datasheet Download