Advanced with Spread Spectrum Crystal Reference Clock input Fundamenta
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PicoEMI Spread Spectrum Clock
Advanced with Spread Spectrum Crystal Reference Clock input Fundamental Crystal input: 20MHz 40MHz Reference Clock input: 20MHz 40MHz Accepts 0.1V reference signal input voltage Outputs: frequency with spread spectrum (FOUT) reference clock (REFOUT) Spread Spectrum Modulation Magnitude: Center Spread: ±0.625%, ±0.875%, ±1.25% ±1.75% Down Spread: -1.25%, -1.75%, -2.5% -3.5% Output Drive Cycle Cycle jitter. Single 2.5V 3.3V, power supply Operating temperature range from -40C Available SOP-8L TSSOP-8L GREEN/RoHS compliant packaging.
CONFIGURATION
XIN/FIN SEL^ FOUT XOUT PDB^ REFOUT
XIN/FIN C/DB^ FOUT
XOUT PDB^ REFOUT
XIN/FIN FOUT
XOUT PDB^ REFOUT
Note: Denotes Pull-up resistor
DESCRIPTION
PL671-23x series Spread Spectrum clock generators (SSCG), members PhaseLink's PicoEMIfamily. PL671-23x products offer spread spectrum output reference clock output. Customers choose from preset modulation magnitudes (Center Down Spread). (x=A~D) allows selecting from magnitudes each chip. C/DB (x=E~H) allows selecting center down spread. addition, Power Down (PDB) feature allows draw <10A when enabled.
BLOCK DIAGRAM
REFOUT Modulation XIN/FIN XOUT Xtal RCounter Phase Detector C/DB MCounter CLK0 Built-in Crystal load Capacitors external caps required Charge Pump Loop Filter
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07
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PicoEMI Spread Spectrum Clock
PACKAGE ASSIGNMENT
Name XIN/FIN C/DB FOUT REFOUT Type connection Selector used toggle between pre-programmed configurations. Internal pull Default=H. PL671-23A~D Selector used toggle between Center Down spreading. Internal pull Default=H (Center). PL671-23E~H Connect. PL671-23Q only. Clock output with spread spectrum. Clock output. This reference input. Power Down (PDB) input. This internal pull resistor turns oscillator output when pulled logic "0". Logic XOUT connection (2.25V~3.63V) Crystal output pin. Connect when using FIN. Output Description Crystal Reference input
Normal Operation (Default)
FUNCTIONAL DESCRIPTION Modulation Magnitude Type
PL671-23x provides following Modulation Types Modulation Magnitudes: Part Number PL671-23A PL671-23B PL671-23C PL671-23D Modulation Magnitude -2.50% -3.50% -1.25% -1.75% ±1.25% ±1.75% ±0.625% ±0.875%
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07
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PicoEMI Spread Spectrum Clock
Part Number PL671-23E PL671-23F PL671-23G PL671-23H C/DB Modulation Magnitude -1.25% ±0.625% -2.50% ±1.25% -1.75% ±0.875% -3.50% ±1.75%
Part Number PL671-23Q
Modulation Magnitude -2.50%
Modulation Rate
Input Frequency (FIN) 20MHz 40MHz Modulation Rate FIN/896
Power-Down Control (PDB)
When activated (logic `0'), `Disables PLL, oscillator circuitry, counters, other active circuitry. Power Down mode consumes <10µA power. input incorporates pull resistor giving default condition logic "1".
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07
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PicoEMI Spread Spectrum Clock
LAYOUT RECOMMENDATIONS
following guidelines assist with performance optimized design:
Signal Integrity Termination Considerations
Keep traces short! Trace Inductor. With capacitive load this equals ringing! Long trace Transmission Line. Without proper termination this will cause reflections (looks like ringing). Design long traces "striplines" "microstrips" with defined impedance. Match trace side avoid reflections bouncing back forth.
Decoupling Power Supply Considerations
Place decoupling capacitors close possible pin(s) limit noise from power supply Multiple pins should decoupled separately best performance. Addition ferrite bead series with help prevent noise from other board sources Value decoupling capacitor frequency dependant. Typical values 0.1F designs using crystals 50MHz 0.01F designs using crystals 50MHz.
Typical CMOS termination Place Series Resistor close possible CMOS output CMOS Output Buffer
Typical buffer impedance line
CMOS Input
Series Resistor
value match output buffer impedance trace. Typical value
Crystal Tuning Circuit Series parallel capacitors used fine tune crystal load circuit load.
Crystal
XOUT
Series Capacitor, used lower circuit load match crystal load. Raises frequency offset. This eliminated using crystal with Cload equal greater value than oscillator. Parallel Capacitors, Used raise circuit load match crystal load. Lowers frequency offset.
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07 Page
PicoEMI Spread Spectrum Clock
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS PARAMETERS Supply Voltage Range Input Voltage Range Output Voltage Range Soldering Temperature (Green package) Data Retention Storage Temperature Ambient Operating Temperature* SYMBOL MIN. -0.5 -0.5 -0.5 MAX. +0.5 +0.5 UNITS Year
Exposure device under conditions beyond limits specified Maximum Ratings extended periods cause permanent damage device affect product reliability. These conditions represent stress rating only, functional operations device these other conditions above operational limits noted this specification implied. *Operating temperature guaranteed design. Parts tested commercial grade only.
SPECIFICATIONS
PARAMETERS Crystal Input Frequency Input (FIN) Frequency Input (FIN) Signal Amplitude Input (FIN) Signal Amplitude Output Frequency Settling Time Output Enable Time Output Rise/Fall Time Duty Cycle Cycle Cycle Jitter =3.3V =2.5V Internally coupled (High Frequency) Internally coupled (Low Frequency) 3.3V <50MHz, 2.5V <40MHz =3.3V =2.5V power-up (after increases over 2.25V) Function; 15pF Load 15pF Load, 10/90% Standard Drive Over output frequency range 3.3V CONDITIONS Fundamental Crystal MIN. TYP. MAX. UNITS
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07
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PicoEMI Spread Spectrum Clock
SPECIFICATIONS
PARAMETERS Supply Current, Dynamic, with Loaded Outputs Operating Voltage Output Voltage Output High Voltage Output Current SYMBOL +4mA -4mA 0.4V, 2.4V CONDITIONS 25MHz, 3.3V, load=15pF, (PDB=1) PDB=0 2.25 MIN. TYP. MAX. 3.63 UNITS
CRYSTAL SPECIFICATIONS
PARAMETERS Fundamental Crystal Resonator Frequency Crystal Loading Rating Maximum Sustainable Drive Level Operating Drive Level Metal Crystal Small Crystal Shunt Capacitance Shunt Capacitance SYMBOL (xtal) MIN. TYP. MAX. UNITS
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07
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PicoEMI Spread Spectrum Clock
PACKAGE DRAWINGS (GREEN PACKAGE COMPLIANT)
SOP-8L Symbol Dimension Min. Max. 1.35 1.75 0.10 0.25 1.25 1.50 0.33 0.53 0.19 0.27 4.80 5.00 3.80 4.00 5.80 6.20 0.40 0.89 1.27
TSSOP-8L Symbol Dimension Min. Max. 1.20 0.05 0.15 0.19 0.30 0.09 0.20 2.90 3.10 4.30 4.50 6.20 6.60 0.45 0.75 0.635
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07
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PicoEMI Spread Spectrum Clock
ORDERING INFORMATION (GREEN PACKAGE COMPLIANT)
part ordering, please contact Sales Department: 47745 Fremont Blvd., Fremont, 94538, Tel: 492-0990 Fax: 492-0991
PART NUMBER
order number this device combination following: Part Number, Package Type Operating Temperature Range
PL671-23x
PART NUMBER X=A, PACKAGE TYPE O=TSSOP-8L S=SOP-8L
NONE= TUBE R=TAPE REEL TEMPERATURE C=COMMERCIAL (0°C 70°C) INDUSTRIAL (-40°C 85°C)
Part/Order Number PL671-23xOC PL671-23xOC-R PL671-23xSC PL671-23xSC-R
Marking P671-23x P671-23x P671-23x P671-23x
Package Option 8-Pin TSSOP Tube 8-Pin TSSOP (Tape Reel) 8-Pin Tube 8-Pin (Tape Reel)
PhaseLink Corporation, reserves right make changes products specifications, both time without notice. information furnished Phaselink believed accurate reliable. However, PhaseLink makes guarantee warranty concerning accuracy said information shall responsible loss damage whatever nature resulting from reliance upon this product. LIFE SUPPORT POLICY: PhaseLink's products authorized critical components life support devices systems without express written approval President PhaseLink Corporation.
Solder reflow profile available
47745 Fremont Blvd., Fremont, California 94538 (510) 492-0990 (510) 492-0991 www.phaselink.com 7/25/07
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