FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR FEATURES di
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ICS843251-04
FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
FEATURES
differential 3.3V LVPECL output Crystal oscillator interface designed 18pF parallel resonant crystals Crystal input frequency range: 19.33MHz 30MHz Output frequency range: 145MHz 187.5MHz frequency range: 580MHz 750MHz phase jitter 156.25MHz (1.875MHz 20MHz): 0.39ps (typical) 3.3V operating supply 70°C ambient operating temperature Industrial temperature information available upon request Available both standard lead-free compliant packages
GENERAL DESCRIPTION
ICS843251-04 10Gb/12Gb Ethernet Clock Generator member HiPerClockSHiPerClocks family high perfor mance devices from ICS. ICS843251-04 synthesize Gigabit Ethernet Gigabit Ethernet with 25MHz crystal. also generate SATA 10Gb Fibre Channel reference clock frequencies with appropriate choice crystals. ICS843251-04 excellent phase jitter performance packaged small 8-pin TSSOP, making ideal systems with limited board space.
CONFIGURATION TABLE
Crystal Frequency (MHz)
WITH
25MHZ CRYSTAL
Output Divide Output Frequency (MHz) 187.5 156.25 Application Gigabit Ethernet Gigabit Ethernet
Inputs Feedback Frequency Divide (MHz)
WITH
CONFIGURATION TABLE
Crystal Frequency (MHz) 21.25 25.5
SELECTABLE CRYSTALS
Inputs Frequency (MHz) 637.5 637.5 Output Divide Output Frequency (MHz) 159.375 159.375 187.5 Application SATA Gigabit Fibre Channel SATA Gigabit Fibre Channel Gigabit Ethernet
Feedback Divide
BLOCK DIAGRAM
XTAL_IN
ASSIGNMENT
Phase Detector
580MHz-750MHz
XTAL_OUT
DIV.
VCCA XTAL_OUT XTAL_IN
FREQ_SEL
(default)
FREQ_SEL Pulldown
ICS843251-04
8-Lead TSSOP 4.40mm 3.0mm 0.925mm package body Package View
Preliminary Information presented herein represents product prototyping pre-production. noted characteristics based initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves right change circuitry specifications without notice. 843251AG-04 REV. SEPTEMBER 2005
ICS843251-04
FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
Type Power Power Input Input Description Analog supply pin. Negative supply pin. Crystal oscillator interface. XTAL_IN input, XTAL_OUT output. Pulldown Frequency select pin. LVCMOS/LVTTL interface levels. Differential clock outputs. LVPECL interface levels. Core supply pin.
TABLE DESCRIPTIONS
Number Name VCCA XTAL_OUT, XTAL_IN FREQ_SEL
Output Power
NOTE: Pulldown refers internal input resistors. Table Characterristics, typical values.
TABLE CHARACTERISTICS
Symbol RPULLDOWN Parameter Input Capacitance Input Pulldown Resistor Test Conditions Minimum Typical Maximum Units
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FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
4.6V -0.5V 0.5V 50mA 100mA 101.7°C/W mps) -65°C 150°C NOTE: Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. These ratings stress specifications only. Functional operation product these conditions conditions beyond those listed Characteristics Characteristics implied. Exposure absolute maximum rating conditions extended periods affect product reliability.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, Inputs, Outputs, Continuous Current Surge Current Package Thermal Impedance, Storage Temperature, TSTG
TABLE POWER SUPPLY CHARACTERISTICS, 3.3V±5%, TA=0°C 70°C
Symbol VCCA ICCA Parameter Core Supply Voltage Analog Supply Voltage Power Supply Current Analog Supply Current Power Supply Current Test Conditions Minimum 3.135 3.135 Typical Maximum 3.465 3.465 Units
TABLE LVCMOS/LVTTL CHARACTERISTICS, 3.3V±5%, TA=0°C 70°C
Symbol Parameter Input High Voltage Input Voltage Input High Current Input Current FREQ_SEL FREQ_SEL FREQ_SEL FREQ_SEL 3.465V 3.465V, Test Conditions Minimum -0.3 Typical Maximum Units
TABLE LVPECL CHARACTERISTICS, 3.3V±5%, TA=0°C 70°C
Symbol VSWING Parameter Output High Voltage; NOTE Output Voltage; NOTE Peak-to-Peak Output Voltage Swing Test Conditions Minimum Typical Maximum Units
NOTE Outputs terminated with
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FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
Test Conditions Minimum 19.33 Typical Fundamental Maximum Units
TABLE CRYSTAL CHARACTERISTICS
Parameter Mode Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitance Drive Level
TABLE CHARACTERISTICS, 3.3V±5%, TA=0°C 70°C
Symbol fOUT Parameter Output Frequency 156.25MHz Integration Range: 1.875MHz 20MHz 159.375MHz Integration Range: 1.875MHz 20MHz 187.5MHz Integration Range: 1.875MHz 20MHz Test Conditions Minimum 0.39 0.48 Typical Maximum 187.5 Units
Phase Jitter (Random); NOTE
Output Rise/Fall Time
Output Duty Cycle NOTE Please refer Phase Noise Plots following this section.
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FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
Phase Noise Plot
LVPECL
Noise Power
SCOPE
Phase Noise Mask
Offset Frequency
-1.3V 0.165V
Jitter Area Under Masked Phase Noise Plot
3.3V OUTPUT LOAD TEST CIRCUIT
PHASE JITTER
PERIOD
Clock Outputs
100%
PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
OUTPUT RISE/FALL TIME
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FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR APPLICATION INFORMATION
POWER SUPPLY FILTERING TECHNIQUES
high speed analog circuitry, power supply pins vulnerable random noise. ICS843251-04 provides separate power supplies isolate high switching noise from outputs internal PLL. VCC, VCCA should individually connected power supply plane through vias, bypass capacitors should used each pin. achieve optimum jitter performance, power supply isolation required. Figure illustrates resistor along with .01F bypass capacitor should connected each VCCA pin. resistor also replaced ferrite bead.
3.3V .01F
.01F
FIGURE POWER SUPPLY FILTERING
CRYSTAL INPUT INTERFACE
ICS843251-04 been characterized with 18pF parallel resonant crystals. capacitor values, shown Figure below were determined using 25MHz, 18pF parallel resonant crystal were chosen minimize error. optimum values slightly adjusted different board layouts.
XTAL_OUT 18pF Parallel Crystal XTAL_IN
Figure CRYSTAL INPUt INTERFACE
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FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
drive transmission lines. Matched impedance techniques should used maximize operating frequency minimize signal distortion. Figures show different layouts which recommended only guidelines. Other suitable clock layouts exist would recommended that board designers simulate guarantee compatibility across printed circuit clock component process variations.
TERMINATION 3.3V LVPECL OUTPUT
clock layout topology shown below typical termination LVPECL outputs. different layouts mentioned recommended only guidelines. FOUT nFOUT impedance follower outputs that generate ECL/LVPECL compatible outputs. Therefore, terminating resistors current path ground) current sources must used functionality. These outputs designed
3.3V
FOUT
FOUT
((VOH VOL) (VCC
FIGURE LVPECL OUTPUT TERMINATION
FIGURE LVPECL OUTPUT TERMINATION
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ICS843251-04
FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR RELIABILITY INFORMATION
TABLE JAVS. FLOW TABLE
LEAD TSSOP
Velocity (Meters Second)
Multi-Layer PCB, JEDEC Standard Test Boards 101.7°C/W
90.5°C/W
89.8°C/W
TRANSISTOR COUNT
transistor count ICS843251-04 1891
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FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
LEAD TSSOP
PACKAGE OUTLINE SUFFIX
TABLE PACKAGE DIMENSIONS
SYMBOL 0.45 -4.30 0.65 BASIC 0.75 0.10 -0.05 0.80 0.19 0.09 2.90 6.40 BASIC 4.50 Millimeters Minimum 1.20 0.15 1.05 0.30 0.20 3.10 Maximum
Reference Document: JEDEC Publication MO-153
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ICS843251-04
FEMTOCLOCKSCRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
Marking 51A04 51A04 1A04L 1A04L Package Lead TSSOP Lead TSSOP Lead "Lead-Free" TSSOP Lead "Lead-Free" TSSOP Shipping Packaging tube 2500 tape reel tube 2500 tape reel Temperature 70°C 70°C 70°C 70°C
TABLE ORDERING INFORMATION
Part/Order Number ICS843251AG-04 ICS843251AG-04T ICS843251AG-04LF ICS843251AG-04LFT
NOTE: that ordered with "LF" suffix number Pb-Free configuration RoHS compliant.
aforementioned trademarks, HiPerClockS FemtoClocks trademarks Integrated Circuit Systems, Inc. subsidiaries United States and/or other countries. While information presented herein been checked both accuracy reliability, Integrated Circuit Systems, Incorporated (ICS) assumes responsibility either infringement patents other rights third parties, which would result from use. other circuits, patents, licenses implied. This product intended normal commercial applications. other applications such those requiring extended temperature range, high reliability, other extraordinary environmental requirements recommended without additional processing ICS. reserves right change circuitry specifications without notice. does authorize warrant product life support devices critical medical instruments. 843251AG-04
REV. SEPTEMBER 2005
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