This part is a kind of semiconductor called PI3C3125.

Function of this product has 2-Port Bus Switch.

Manufacturers : Pericom Semiconductor Corporation

Image and pinout :

Some of the text within the PDF file :

PI3C3125 PI3C3126 111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222 2.5V/3.3V, High Bandwidth, Hot Insertion,4-Bit, 2-Port Bus Switch with Individual Enables Product Features • Near zero propagation delay • 5Ω switches connect inputs to outputs • High Bandwidth (>400 MHz) • Rail-to-Rail, or 2.5V or 3.3V Switching • 5V I/O Tolerant • 2.5V Supply Voltage Operation • Permits Hot Insertion • Packages available: – 14-p [ ... ]

PI3C3125 PDF Datasheet Download