This part is a kind of semiconductor called ABB0204.
Function of this product has Low Skew Output Buffer.
Manufacturers : Abracon Corporation
Image and pinout :
Some of the text within the PDF file :
ABB0204 Low Skew Output Buffer FEATURES • • • • • • • • • Frequency range 50 ~ 120MHz. Internal phase locked loop will allow spread spectrum modulation on reference clock to pass to the outputs (up to 100kHz SST modulation). Zero input - output delay. Less than 700 ps device - device skew. Less than 250 ps skew between outputs. Less than 200 ps cycle - cycle jitter. Output Enable function tri-state outputs. 3.3V operation. Available in 8-Pin 150mil SOIC. PIN CONFIGURATION REF CLK2 CLK1 GND 1 8 CLKOUT CLK4 VDD CLK3 ABB0204 2 3 4 7 6 5 Remark If REF clock is stopped for more than 10us after it has already been provided to the chip, and after power-up, the output clocks will disappear. In that instance, a full power-up reset is required in order [ ... ]