FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER FEATURES

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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER FEATURES

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ICS8430252-45
FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
FEATURES
differential 3.3V LVPECL output LVCMOS/LVTTL output Crystal oscillator interface designed 25MHz, 18pF parallel resonant crystal 25MHz crystal generates both output frequency 156.25MHz (LVPECL) 125MHz (LVCMOS) frequency: 625MHz phase jitter 156.25MHz (1.875MHz 20MHz) using 25MHz crystal: 0.39ps (typical) Full 3.3V supply mode 70°C ambient operating temperature Industrial temperature available upon request Available both standard lead-free RoHS compliant packages
GENERAL DESCRIPTION
ICS8430252-45 output LVPECL LVCMOS/LVTTL Synthesizer optimized genHiPerClockSerate Ethernet reference clock frequencies member HiPerClocksfamily high performance clock solutions from ICS. Using 25MHz, 18pF parallel resonant crystal, following frequencies generated: 156.25MHz LVPECL output and, 125MHz LVCMOS output. 8430252-45 uses ICS' generation phase noise technology achieve lower typical phase jitter, easily meeting Ethernet jitter requirements. ICS8430252-45 packaged small 16-pin TSSOP package.
BLOCK DIAGRAM
Pullup
ASSIGNMENT
VCCO_A VCCA CLK_EN VCCO_B XTAL_IN XTAL_OUT
XTAL_IN XTAL_OUT
25MHz
Phase Detector
625MHz
Feedback Divider
CLK_EN
Pullup
ICS8430252-45
16-Lead TSSOP 4.4mm 5.0mm 0.92mm 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. 8430252CG-45 REV. DECEMBER 2005
ICS8430252-45
FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
Type Description Output enable pin. LVCMOS/LVTTL interface levels. Table Function Table. Negative supply pin. LVCMOS/LVTTL clock output. Output supply output. connect. Analog supply pin. Core supply pin. Crystal oscillator interface. XTAL_IN input, XTAL_OUT output. Output supply outputs. Differential clock outputs. LVPECL interface levels. Clock enable pin. LVCMOS/LVTTL interface levels. Table Function Table.
TABLE DESCRIPTIONS
Number Name VCCO_A VCCA XTAL_OUT, XTAL_IN VCCO_B nQB, CLK_EN Input Power Output Power Unused Power Power Input Power Output Input Pullup
Pullup
TABLE CHARACTERISTICS
Symbol Parameter RPULLUP Input Capacitance Power Dissipation Capacitance Input Pullup Resistor VCC, VCCA, VCCO_A, VCCO_B 3.465V Test Conditions Minimum Typical Maximum Units
TABLE SELECT FUNCTION TABLE
Input Output Hi-Z Active
TABLE CLK_EN SELECT FUNCTION TABLE
Input CLK_EN Active Outputs High Active
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
4.6V -0.5V 0.5V 50mA 100mA 89°C/W lfpm) -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, VCCA VCCO_A, VCCO_B 3.3V±5%, 70°C
Symbol VCCA VCCO_A, VCCO_B ICCA Parameter Core Supply Voltage Analog Supply Voltage Output Supply Voltage Power Supply Current Analog Supply Current Test Conditions Minimum 3.135 3.135 3.135 Typical Maximum 3.465 3.465 3.465 Units
TABLE LVCMOS LVTTL CHARACTERISTICS, VCCA VCCO_A 3.3V±5%, 70°C
Symbol Parameter Input High Voltage Input Voltage Input High Current Input Current CLK_EN CLK_EN 3.465V 3.465V, -150 Test Conditions Minimum -0.3 Typical Maximum Units
Output High Voltage; NOTE
Output Voltage; NOTE NOTE Outputs terminated with VCCO_A/2. Parameter Measurement Information Section, "3.3V Output Load Test Circuit".
TABLE LVPECL CHARACTERISTICS, VCCA VCCO_B 3.3V±5%, 70°C
Symbol VSWING Parameter Output High Voltage; NOTE Output Voltage; NOTE Peak-to-Peak Output Voltage Swing Test Conditions Minimum VCCO VCCO Typical Maximum VCCO VCCO Units
NOTE Outputs terminated with VCCO_B
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
Test Conditions Minimum Typical Fundamental Maximum Units
TABLE CRYSTAL CHARACTERISTICS
Parameter Mode Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitance Drive Level NOTE: Characterized using 18pF parallel resonant crystal.
TABLE CHARACTERISTICS, VCCA VCCO_A, VCCO_B 3.3V±5%, 70°C
Symbol fOUT Parameter Output Frequency Range Phase Jitter (Random); NOTE Output Rise/Fall Time Output Duty Cycle 125MHz (1.875MHz 20MHz) 156.25MHz (1.875MHz 20MHz) Test Conditions Minimum Typical 156.25 0.41 0.39 Maximum Units
NOTE Please refer Phase Noise Plots.
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
TYPICAL PHASE NOISE 156.25MHZ
10Gb Ethernet Filter 156.25MHz
Phase Jitter (Random) 1.875Mhz 20MHz 0.39ps (typical)
NOISE POWER
-100 -110
Phase Noise Data
-120 -130 -140 -160 -170 -180 -190
Phase Noise Result adding 10Gb Ethernet Filterto data
100k
-150
100M
OFFSET FREQUENCY (HZ)
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
1.65V±5%
VCCA, VCCO_B
SCOPE
VCCA VCCO_A
SCOPE
LVPECL
LVCMOS
-1.3V±0.165V -1.65V±5%
3.3V CORE/3.3V LVPECL OUTPUT LOAD TEST CIRCUIT
Phase Noise Plot
3.3V CORE/3.3V LVCMOS OUTPUT LOAD TEST CIRCUIT
CCO_LVCMOS
Noise Power
Phase Noise Mask
PERIOD
Offset Frequency
PERIOD
100%
Jitter Area Under Masked Phase Noise Plot
PHASE JITTER
LVCMOS OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
PERIOD
PERIOD
Clock Outputs
100%
LVPECL OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
Clock Outputs
LVCMOS OUTPUT RISE/FALL TIME
LVPECL OUTPUT RISE/FALL TIME
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER APPLICATION INFORMATION
POWER SUPPLY FILTERING TECHNIQUES
high speed analog circuitry, power supply pins vulnerable random noise. ICS8430252-45 provides separate power supplies isolate high switching noise from outputs internal PLL. VCC, VCCA, VCCO_X 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.
3.3V .01F VCCA .01F
FIGURE POWER SUPPLY FILTERING
CRYSTAL INPUT INTERFACE
ICS8430252-45 been characterized with 18pF parallel resonant crystals. capacitor values shown Figure below were determined using 25MHz, 18pF parallel resonant crystal were chosen minimize error.
XTAL_OUT 18pF Parallel Crystal XTAL_IN
Figure CRYSTAL INPUt INTERFACE
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
RECOMMENDATIONS UNUSED INPUT INPUTS:
OUTPUT PINS OUTPUTS:
LVCMOS OUTPUT: unused LVCMOS output left floating. recommend that there trace attached. LVPECL OUTPUT unused LVPECL outputs left floating. recommend that there trace attached. Both sides differential output pair should either left floating terminated.
SELECT PINS: select pins have internal pull-ups pull-downs; additional resistance required added additional protection. resistor used.
TERMINATION
3.3V LVPECL OUTPUT
designed 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.
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
3.3V
FOUT
((VOH VOL) (VCC
FOUT
FIGURE LVPECL OUTPUT TERMINATION
FIGURE LVPECL OUTPUT TERMINATION
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER POWER CONSIDERATIONS
This section provides information power dissipation junction temperature ICS8430252-45. Equations example calculations also provided. Power Dissipation. total power dissipation ICS8430252-45 core power plus power dissipated load(s). following power dissipation 3.3V 3.465V, which gives worst case results. NOTE: Please refer Section details calculating power dissipated load.
Power (core)MAX VCC_MAX IEE_MAX 3.465V 75mA 259.88mW Power (outputs)MAX 30mW/Loaded Output pair outputs loaded, total power 30mW 90mW
Total Power_MAX (3.465V, with outputs switching) 259.9mW 60mW 319.9mW
Junction Temperature. Junction temperature, temperature junction bond wire bond directly affects reliability device. maximum recommended junction temperature HiPerClockSdevices 125°C. equation follows: Pd_total Junction Temperature Junction-to-Ambient Thermal Resistance Pd_total Total Device Power Dissipation (example calculation section above) Ambient Temperature order calculate junction temperature, appropriate junction-to-ambient thermal resistance must used. Assuming moderate flow linear feet minute multi-layer board, appropriate value 81.8°C/W Table below. Therefore, ambient temperature 70°C with outputs switching 70°C 0.320W 81.8°C/W 96.2°C. This well below limit 125°C. This calculation only example. will obviously vary depending number loaded outputs, supply voltage, flow, type board (single layer multi-layer).
TABLE THERMAL RESISTANCE
16-PIN TSSOP, FORCED CONVECTION
Velocity (Linear Feet Minute)
Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 137.1°C/W 89.0°C/W
118.2°C/W 81.8°C/W
106.8°C/W 78.1°C/W
NOTE: Most modern designs multi-layered boards. data second pertains most designs.
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ICS8430252-45
FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
Calculations Equations. purpose this section derive power dissipated into load. LVPECL output driver circuit termination shown Figure
VOUT
FIGURE LVPECL DRIVER CIRCUIT
TERMINATION
calculate worst case power dissipation into load, following equations which assume load, termination voltage
logic high, VOUT VOH_MAX VCC_MAX 0.9V
CCO_MAX
OH_MAX
0.9V 1.7V
logic low, VOUT
CCO_MAX
OL_MAX
CC_MAX
OL_MAX
1.7V
Pd_H power dissipation when output drives high. Pd_L power dissipation when output drives low. ))/R 2V))/R [(2V Pd_H OH_MAX CC_MAX CC_MAX OH_MAX OH_MAX CC_MAX OH_MAX CC_MAX [(2V 0.9V)/50] 0.9V 19.8mW
Pd_L
OL_MAX
CC_MAX
2V))/R
CC_MAX
OL_MAX
[(2V
CC_MAX
OL_MAX
))/R
CC_MAX
OL_MAX
[(2V 1.7V)/50] 1.7V 10.2mW Total Power Dissipation output pair Pd_H Pd_L 30mW
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ICS8430252-45
FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER RELIABILITY INFORMATION
TABLE JAVS. FLOW TABLE
LEAD TSSOP
Velocity (Linear Feet Minute)
Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 137.1°C/W 89.0°C/W
118.2°C/W 81.8°C/W
106.8°C/W 78.1°C/W
NOTE: Most modern designs multi-layered boards. data second pertains most designs.
TRANSISTOR COUNT
transistor count ICS8430252-45 2070
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FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
LEAD TSSOP
PACKAGE OUTLINE SUFFIX
TABLE PACKAGE DIMENSIONS
SYMBOL 0.45 -4.30 -0.05 0.80 0.19 0.09 4.90 6.40 BASIC 4.50 0.65 BASIC 0.75 0.10 Millimeters Minimum 1.20 0.15 1.05 0.30 0.20 5.10 Maximum
Reference Document: JEDEC Publication MO-153
8430252CG-45
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ICS8430252-45
FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
TABLE ORDERING INFORMATION
Part/Order Number Marking Package Shipping Packaging Temperature ICS8430252CG-45 30252C45 Lead TSSOP tube 70°C ICS8430252CG-45T 30252C45 Lead TSSOP 2500 tape reel 70°C ICS8430252CG-45LF Lead "Lead-Free" TSSOP tube 70°C ICS8430252CG-45LFT Lead "Lead-Free" TSSOP 2500 tape reel 70°C 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. 8430252CG-45
REV. DECEMBER 2005

FEMTOCLOCKSCRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER FEATURES

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