PDF ICS843S1066 Data sheet ( Hoja de datos )

Número de pieza	ICS843S1066
Descripción	CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
Fabricantes	IDT
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No Preview Available ! CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER ICS843S1066 General Description The ICS843S1066 is a high frequency clock ICS generator and is a member of the HiPerClockS™ HiPerClockS™ family of High Performance Clock Solutions from IDT. The ICS843S1066 uses an external 20MHz crystal to synthesize either 1066.67MHz or 1600MHz. The ICS843S1066 has excellent cycle-to-cycle and RMS period jitter performance. The ICS843S1066 operates at 3.3V operating supply and is available in a fully RoHS compliant 8-lead TSSOP package. Features • One differential LVPECL output • Crystal oscillator interface designed for 18pF, 20MHz parallel resonant crystal • Cycle-to-Cycle Jitter: 25ps (maximum) • Period Jitter, RMS: 1.9ps (maximum) • Output Duty Cycle: 48 – 52% • Full 3.3V supply mode • 0°C to 70°C ambient operating temperature • Available in lead-free (RoHS 6) package Table 1. Frequency Table F_SEL Crystal Frequency (MHz) 0 20 1 20 Multiplier Value 53.3 80 Output Frequency (MHz) 1066.67 (default) 1600 Block Diagram F_SEL Pulldown 20MHz XTAL_IN OSC XTAL_OUT PLL Multiplier Q nQ Pin Assignment VCCA VEE XTAL_OUT XTAL_IN 1 2 3 4 8 VCC 7Q 6 nQ 5 F_SEL ICS843S1066 8 Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View IDT™ / ICS™ 3.3V LVPECL CLOCK SYNTHESIZER 1 ICS843S1066CG REV. A AUGUST 27, 2008 1 page ICS843S1066 CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER Application Information Power Supply Filtering Technique As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. To achieve optimum jitter perform- ance, power supply isolation is required. TheICS843S1066 provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. VCC and VCCA should be individually connected to the power supply plane through vias, and 0.01µF bypass capacitors should be used for each pin. Figure 1 illustrates this for a generic VCC pin and also shows that VCCA requires that an additional 10Ω resistor along with a 10µF bypass capacitor be connected to the VCCA pin. 3.3V VCC .01µF 10Ω VCCA .01µF 10µF Figure 1. Power Supply Filtering Crystal Input Interface The ICS843S1066 has been characterized with 18pF parallel resonant crystals. The capacitor values, C1 and C2, shown in Figure 2 below were determined using a 20MHz, 18pF parallel resonant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts. X1 18pF Parallel Crystal XTAL_IN C1 14p XTAL_OUT C2 14p Figure 2. Crystal Input Interface IDT™ / ICS™ 3.3V LVPECL CLOCK SYNTHESIZER 5 ICS843S1066CG REV. A AUGUST 27, 2008 5 Page ICS843S1066 CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER Ordering Information Table 9. Ordering Information Part/Order Number 843S1066CGLF 843S1066CGLFT Marking 66CL 66CL Package “Lead-Free” 8 Lead TSSOP “Lead-Free” 8 Lead TSSOP Shipping Packaging Tube 2500 Tape & Reel Temperature 0°C to 70°C 0°C to 70°C NOTE: Parts that are ordered with an "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications, such as those requiring extended temperature ranges, high reliability or other extraordinary environmental requirements are not recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDT™ / ICS™ 3.3V LVPECL CLOCK SYNTHESIZER 11 ICS843S1066CG REV. A AUGUST 27, 2008 11 Page

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Número de pieza	Descripción	Fabricantes
ICS843S1066	CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER	IDT

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