This part is a kind of semiconductor called HC4052.

Function of this product has 8-Channel Analog Multiplexer . Dual 4-Channel Analog Multiplexer . Triple 2-Channel Analog Multiplexer.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

74VHC4051 • 74VHC4052 • 74VHC4053 8-Channel Analog Multiplexer • Dual 4-Channel Analog Multiplexer • Triple 2-Channel Analog Multiplexer April 1994 Revised April 1999 74VHC4051 • 74VHC4052 • 74VHC4053 8-Channel Analog Multiplexer • Dual 4-Channel Analog Multiplexer • Triple 2-Channel Analog Multiplexer General Description These multiplexers are digitally controlled analog switches implemented in advanced silicon-gate CMOS technology. These switches have low “on” resistance and low “off” leakages. They are bidirectional switches, thus any analog input may be used as an output and vice-versa. Also these switches contain linearization circuitry which lowers the “on” resistance and increases switch linearity. These devices allow control of up to ±6V (peak) analog [ ... ]

HC4052 PDF Datasheet Download