This part is a kind of semiconductor called 74HC4046.

Function of this product has CMOS Phase Lock Loop.

Manufacturers : Fairchild

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Some of the text within the PDF file :

MM74HC4046 CMOS Phase Lock Loop February 1984 Revised February 1999 MM74HC4046 CMOS Phase Lock Loop General Description The MM74HC4046 is a low power phase lock loop utilizing advanced silicon-gate CMOS technology to obtain high frequency operation both in the phase comparator and VCO sections. This device contains a low power linear voltage controlled oscillator (VCO), a source follower, and three phase comparators. The three phase comparators have a common signal input and a common comparator input. The signal input has a self biasing amplifier allowing signals to be either capacitively coupled to the phase comparators with a small signal or directly coupled with standard input logic levels. This device is similar to the CD4046 except that the Zener diode of the metal gate CMOS device [ ... ]

74HC4046 PDF Datasheet Download