This part is a kind of semiconductor called 100390PC.

Function of this product has Low Power Single Supply Hex PECL-to-TTL Translator.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

100390 Low Power Single Supply Hex PECL-to-TTL Translator September 1990 Revised August 2000 100390 Low Power Single Supply Hex PECL-to-TTL Translator General Description The 100390 is a hex translator for converting F100K logic levels to TTL logic levels. Unlike other level translators, the 100390 operates using only one +5V supply. Differential inputs allow each circuit to be used as an inverting, noninverting, or differential receiver. An internal reference generator provides VBB for single-ended operation. The standard FAST 3-STATE outputs are enabled by a common active low TTL compatible OE input. Partitioned VCCs on chip are brought out on separate power pins, allowing the noisy TTL VCC power plane to be isolated from the relatively quiet ECL VCC. The 100390 is ideal for applica [ ... ]

100390PC PDF Datasheet Download