ICS841664I

FemtoClock® Crystal-to-HCSL Clock Generator ICS841664I DATA SHEET General Description The ICS841664I is an optimized sRIO clock generator and a member of the family of high-performance clock solutions from IDT. The device uses a 25MHz parallel crystal to generate 125MHz and 156.25MHz clock signals, replacing solution requiring multiple oscillator and fanout buffer solutions. The device has excellent phase jitter (<1ps RMS) suitable to clock components requiring precise and low-jitter sRIO clock signals. Designed for telecom, networking and industrial application, the ICS841664I can also drive the high-speed sRIO SerDes clock inputs of communication processors, DSPs, switches and bridges. Features Four differential HCSL clock outputs: configurable for sRIO (125MHz or 156.25MHz) clock signals One REF_OUT LVCMOS/LVTTL clock output Selectable crystal oscillator interface, 25MHz, 18pF parallel resonant crystal or LVCMOS/LVTTL single-ended reference clock input or LVCMOS/LVTTL single-ended input Supports the following output frequencies: 125MHz or 156.25MHz VCO: 625MHz Supports PLL bypass and output enable functions RMS phase jitter, using a 25MHz crystal (1.875MHz - 20MHz): 0.45ps (typical) @ 125MHz Full 3.3V power supply mode -40°C to 85°C ambient operating temperature Lead-free (RoHS 6) packaging Block Diagram XTAL_IN 25MHz XTAL_OUT REF_IN REF_SEL OSC Pulldown Pulldown IREF 0 fref 1 FemtoClock PLL VCO = 625MHz M = ÷25 BYPASS FSEL[0:1] MR/nOE Pulldow...