ICS840-77 synthesizer equivalent, crystal-to lvcmos/lvttl frequency synthesizer.
* One LVCMOS/LVTTL output, 15Ω output impedence
* Crystal oscillator interface designed for 19.44MHz, 18pF parallel resonant crystal
* Output frequency: 77.76.
not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be left floating. Though not requir.
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