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Micrel, Inc.
ULTRA-PRECISION 1:4LVPECL FANOUTBUFFER/TRANSLATOR WITHINTERNALTERMINATION
SY89831U Precision Edge(R) SY89831U
Precision Edge(R)
FEATURES
Guaranteed AC performance over temperature and voltage: * DC-to>2.0GHzthroughput * <450pspropagationdelay(IN-to-Q) * <20pswithin-deviceskew * <225psrise/falltime Ultra-lowjitterdesign: * <62fsRMSphasejitter(Typ) Uniquepatent-pendinginputterminationandVTpin acceptsDC-andAC-coupleddifferentialinputs 800mV,100KLVPECLoutputswing Powersupply2.5V5%or3.3V10% Industrialtemperaturerange: -40Cto+85C Availablein16-pin(3mmx3mm)MLF(R)package Precision Edge(R)
DESCRIPTION
The SY89831U is a high-speed, 2GHz differential LVPECL 1:4 fanout buffer optimized for ultra-low skew applications. Within device skew is guaranteed to be less than 20ps (5ps typ.) over supply voltage and temperature. The differential input buffer has a unique internal termination design that allows access to the termination network through a VT pin. This feature allows the device to easily interface to different logic standards. A VREF-AC reference output is included for AC-coupled applications. The SY89831U is a part of Micrel's high-speed clock synchronization family. For applications that require a different I/O combination, consult Micrel's website at: www. micrel.com, and choose from a comprehensive product line of high-speed, low-skew fanout buffers, translators and clock generators.
APPLICATIONS
Processorclockdistribution SONETclockdistribution FibreChannelclockdistribution GigabitEthernetclockdistribution
FUNCTIONALBLOCKDIAGRAM
TYPICALPERFORMANCE
Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-072210 hbwhelp@micrel.com or (408) 955-1690
1
Rev.: F
Amendment: /0
Issue Date: July 2010
Micrel, Inc.
Precision Edge(R) SY89831U
PACKAGE/ORDERINGINFORMATION
Ordering Information(1)
PartNumber SY89831UMI SY89831UMITR(2) SY89831UMG(3) SY89831UMGTR(2, 3) Package Type MLF-16 MLF-16 MLF-16 MLF-16 Operating Range Industrial Industrial Industrial Industrial Package Marking 831U 831U 831U with Pb-Free bar-line indicator 831U with Pb-Free bar-line indicator Lead Finish Sn-Pb Sn-Pb NiPdAu Pb-Free NiPdAu Pb-Free
16-PinMLF(R)(MLF-16)
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. 3. Pb-Free package is recommended for new designs.
PIN DESCRIPTION
PinNumber 15, 16 1, 2, 3, 4, 5, 6 8 PinName Q0, /Q0 Q1, /Q1 Q2, /Q2 Q3, /Q3 EN PinFunction Differential 100K LVPECL Outputs: These LVPECL outputs are the precision, low skew copies of the inputs. Please refer to the "Truth Table" section for details. Unused output pairs may be left open. Terminate wtih 50y to VCC-2V. See "Output Termination Recommendations" section for more details. This single-ended TTL/CMOS-compatible input functions as a synchronous output enable. The synchronous enable ensures that enable/disable will only occur when the outputs are in a logic LOW state. Note that this input is internally connected to a 25ky pull-up resistor and will default to logic HIGH state (enabled) if left open. Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs accept AC- or DC-Coupled differential signs as small as 100mV. Each pin of a pair internally terminates to a VT pin through 50y. Note that these inputs will default to an intermediate state if left open. Pleae refer to the "Input Interface Applications" section for more details. Reference Voltage: These outputs bias to VCC-1.4V. They are used when AC coupling the inputs (IN, /IN). For AC-Coupled applications, connect VREF-AC to VT pin and bypass with 0.01F low ESR capacitor to VCC. See "Input Interface Applications" section for more details. Maximum sink/source current is 1.5mA. Due to the limited drive capability, each VREF-AC pin is only intended to drive its respective VT pin. If VREF-AC is used with a 2.5V supply, make sure input swing is large enough to not violate VIH min. spec.
9, 12
/IN, IN
10
VREF-AC
11 13 7, 14
VT GND VCC
Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VTpinsprovideacenter-taptoaterminationnetworkformaximuminterfaceflexibility.See"Input Interface Applications" section for more detaiils. Ground. GND pins and exposed pad must be connected to the most negative potential of the device ground. Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitors and place as close to each VCC pin as possible.
TRUTHTABLE
IN 0 1 X /IN 1 0 X EN 1 1 0 Q 0 1 0(1) /Q 1 0 1(1)
Note: 1. On next negative transition of the input signal (IN). M9999-072210 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
Precision Edge(R) SY89831U
AbsoluteMaximumRatings(1)
Supply Voltage (VCC)....................................-0.5V to +4.0V Input Voltage (VIN) .................................-0.5V to VCC +0.5V LVPECL Output Current (IOUT) Continuous.......................................................... 50mA Surge ................................................................ 100mA Input Current Source or Sink Current on (IN, /IN)................... 50mA VREF-AC Current Source or Sink Current on (IVT) .......................... 2mA Lead Temperature (soldering, 20sec.) ....................... 260C Storage Temperature (TS) ........................ -65C to +150C
Operating Ratings(2)
Supply Voltage Range ......................... +2.375V to +2.625V ............................................................. +3.0V to +3.6V Ambient Temperature (TA) .......................... -40C to +85C Package Thermal Resistance(3) MLFTM (JA) Still-Air ...................................................................... 60C/W (JB) Junction-to-Board ...................................... 32C/W
DCELECTRICALCHARACTERISTICS(4)
TA = -40C to +85C, unless otherwise stated. Symbol VCC ICC Parameter Power Supply Power Supply Current Input Resistance (IN-to-VT) Differential Input Resistance (IN-to-/IN) Input HIGH Voltage (IN, /IN) Input LOW Voltage (IN, /IN) Input Voltage Swing (IN, /IN) Differential Input Voltage Swing |IN - /IN| Output Reference Voltage see Figure 1a. see Figure 1b. No load, max. VCC. Condition Min 2.375 3.0 47 45 90 1.2 0 0.1 0.2 VCC-1.525 VCC-1.425 VCC-1.325 50 100 Typ Max 2.625 3.6 70 55 110 VIH-0.1 1.7 VCC Units V mA y y V V V V V
RIN
RDIFF-IN VIH VIL VIN
VDIFF_IN VREF-AC
LVTTL/LVCMOSINPUTDCELECTRICALCHARACTERISTICS
VCC = 2.375V to 3.60V; VEE = 0V; TA = -40C to +85C Symbol VIL IIH IIL VIH Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Condition Min 2.0 0 -125 -300 Typ Max VCC 0.8 20 Units V V A A
Notes: 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions for extended periods may affect device reliability. 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. Packagethermalresistanceassumesexposedpadissoldered(orequivalent)tothedevice'smostnegativepotentialonthePCB.JBandJA values are determined for a 4-layer board in stil-air number, unless otherrwise stated. 4. ThecircuitisdesignedtomeettheDCspecificationsshownintheabovetableafterthermalequilibriumhasbeenestablished.
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Micrel, Inc.
Precision Edge(R) SY89831U
LVPECLOUTPUTDCELECTRICALCHARACTERISTICS(6)
VCC = +2.5V 5% or +3.3V 10%; RL = 50y to VCC -2V; TA = -40C to +85C unless otherwise stated. Symbol VOH VOL VOUT VDIFF_OUT Parameter Condition Output HIGH Voltage (Q, /Q) Output LOW Voltage (Q, /Q) Output Voltage Swing (Q, /Q) Differential Output Voltage Swing (Q, /Q) See Figure 1a. See Figure 1b. Min Typ Max VCC-0.895 VCC-1.695 800 1600 Units V V mV mV
VCC-1.145 VCC-1.945 550 1100
LVTTL/CMOSDCELECTRICALCHARACTERISTICS(6)
VCC = +2.5V 5% or +3.3V 10%; TA = -40C to +85C unless otherwise stated. Symbol VIL IIH IIL VIH Parameter Condition Input HIGH Voltage Input LOW Voltage Input HIGH Voltage Input LOW Voltage -125 -300 Min 2.0 Typ Max VCC 0.8 30 Units V V A A
Notes: 6. ThecircuitisdesignedtomeettheDCspecificationsshownintheabovetableafterthermalequilibriumhasbeenestablished.
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Micrel, Inc.
Precision Edge(R) SY89831U
ACELECTRICALCHARACTERISTICS(7)
VCC = +2.5V 5% or +3.3V 10%; RL = 50y to VCC -2V; TA = -40C to +85C unless otherwise stated. Symbol fMAX tpd Parameter Condition Maximum Frequency Propagation Delay Within-Device Skew Part-to-Part Skew Set-Up Time Hold Time RMS Phase Jitter Output Rise/Fall Times (20% to 80%) EN to IN, /IN EN to IN, /IN IN-to-Q IN-to-Q VOUT450mV Min 2.0 250 Typ 2.5 390 350 5 300 300 62 70 150 225 Max 450 20 150 Units GHz ps ps ps ps ps ps fs ps
VIN100mV Note 8
tSKEW tS
VIN 800mV Note 9 Note10 Note10 Output = 622MHz Integration Range 12kHz - 20MHz At full output swing.
tH
tJITTER tr, tf
Notes: 7. 8. 9.
High-frequency AC parameters are guaranteed by design and characterization. Within device skew is measured between two different outputs under identical input transitions. Part-to-partskewisdefinedfortwopartswithidenticalpowersupplyvoltagesatthesametemperatureandnoskewattheedgesattherespective inputs.
10. Set-up and hold times apply to synchronous applications that intend to enable/disable before the next clock cycle. For asynchronous applications, set-up and hold times do not apply.
PHASENOISE
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Micrel, Inc.
Precision Edge(R) SY89831U
TYPICALOPERATINGCHARACTERISTICS
VCC = 3.3V, GND = 0V, RL = 50y to VCC-2V, TA = 25C, unless otherwise stated.
Output Swing vs. Frequency Propagation Delay vs. Temperature Propagation Delay vs. Input Voltage Swing
900 800 700 600 500 400 300 200 100 0 0
390 380 370 360 350 340 330 320 310
450 425 400 375 350 325
1000 2000 FREQUENCY (MHz)
3000
300 -40 -20
0 20 40 60 TEMPERATURE (C)
80
100
300 100
300 500 700 INPUT VOLTAGE SWING (V)
900
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Micrel, Inc.
Precision Edge(R) SY89831U
FUNCTIONALCHARACTERISTICS
VCC = 3.3V, GND = 0V, VIN = 800mV, RL = 50y to VCC-2V, TA = 25C, unless otherwise stated.
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Micrel, Inc.
Precision Edge(R) SY89831U
SINGLE-ENDEDANDDIFFERENTIALSWINGS
Figure1a. Single-EndedSwing
Figure1b. DifferentialSwing
INPUT AND OUTPUT STAGES
Figure2a. SimplifiedDifferential
Figure2b. SimplifiedLVPECLOutputStage
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Micrel, Inc.
Precision Edge(R) SY89831U
INPUTINTERFACEAPPLICATIONS
For 2.5V, Rpd = 50y For 3.3V, Rpd = 100y
Figure3a. DC-CoupledLVPECL Input Interface
Figure3b. AC-CoupledLVPECL Input Interface
Figure3c. DC-CoupledCML Input Interface
Figure3d. AC-CoupledCML Input Interface
Figure3e. LVDSInterface
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Micrel, Inc.
Precision Edge(R) SY89831U
OUTPUT TERMINATION RECOMMENDATIONS
Figure 4. Parallel Termination-- Thevenin Equivalent
Note: 1. For +2.5V systems: R1 = 250y, R2 = 62.5y.
Figure 5. Three-Resistor "Y-Termination"
Notes: 1. Power-saving alternative to Thevenin termination. 2. Place termination resistors as close to destination inputs as possible. 3. Rb resistor sets the DC bias voltage, equal to Vt. For +2.5V systems Rb = 19y. 4. C1 is an optional bypass capacitor intended to compensate for any tr/tf mismatches.
RELATEDPRODUCTANDSUPPORTDOCUMENTATION
PartNumber Function SY89830U SY89832U SY89833U SY89834U 1:4 LVPECL Fanout Buffer w/2:1 MUX Input 2.5V Ultra-Precision 1:4 LVDS Fanout Buffer/ Translator with Internal Termination 3.3V Ultra-Precision 1:4 LVDS Fanout Buffer/ Translator with Internal Termination DataSheetLink www.micrel.com/product-info/products/sy89830u.shtml www.micrel.com/product-info/products/sy89832u.shtml www.micrel.com/product-info/products/sy89833u.shtml
2.5/3.3V Two Input, 1GHz LVTTL/CMOS-to-LVPECL www.micrel.com/product-info/products/sy89833u.shtml 1:4 Fanout Buffer/Translator www.micrel.com/product-info/products/solutions.shtml www.amkor.com/products/notes_papers/MLF_AppNote_0301.pdf 16-MLF(R) Manufacturing Guidelines Exposed Pad Application Note
HBW Solutions New Products and Applications
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Micrel, Inc.
Precision Edge(R) SY89831U
16-PINEPAD MicroLeadFrame(R)(MLF-16)
PCBThermalConsiderationfor16-PinMLF(R) Package (Alwayssolder,orequivalent,theexposedpadtothePCB)
PackageNotes: Note 1. PackagemeetsLevel2moisturesensitivityclassification,andareshippedindry-packform. Note2. Exposed pads must be soldered to a ground for proper thermal management.
MICREL,INC. 2180FORTUNEDRIVE SANJOSE,CA 95131 USA
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrelreservestherighttochangecircuitryandspecificationsatanytimewithoutnotificationtothecustomer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into thebodyor(b)supportorsustainlife,andwhosefailuretoperformcanbereasonablyexpectedtoresultinasignificantinjurytotheuser.APurchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. M9999-072210 hbwhelp@micrel.com or (408) 955-1690
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