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| SY89851U Low Power, 3GHz, 1:2 LVPECL Fanout Buffer/Translator with Internal Termination General Description The SY89851U is a low jitter, low skew, high-speed 1:2 differential fanout buffer optimized for precision telecom and enterprise server distribution applications. The SY89851U distributes clock frequencies from DC to >3GHz, and data rates to 2.5Gbps guaranteed over temperature and voltage. The SY89851U differential input includes Micrel's unique, 3-pin input termination architecture that directly interfaces to any differential signal (AC- or DC-coupled) as small as 100mV (200mVpp) without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100Kcompatible LVPECL with extremely fast rise/fall time guaranteed to be less than 180ps. The SY89851U operates from a 2.5V 5% or 3.3V 10% supply and is guaranteed over the full industrial temperature range of -40C to +85C. The SY89851U is part of Micrel's high-speed, Precision Edge(R) product line. All support documentation can be found on Micrel's web site at www.micrel.com. Precision Edge(R) Features * Precision 1:2, 800mV LVPECL fanout buffer * Low power consumption: 80mW typ. (2.5V) * Guaranteed AC performance over temperature and voltage: - DC to >3GHz clock throughput - <340ps propagation delay - <180ps rise/fall time - <20ps output-to-output skew * Ultra-low jitter design: - <1psRMS random jitter - <10psPP deterministic jitter - <10psPP total jitter (clock) * Unique, patented input termination and VT pin accepts DC- and AC-coupled inputs (CML, LVPECL, LVDS) * 100K LVPECL-compatible outputs * Power supply 2.5V 5% or 3.3V 10% * -40C to +85C industrial temperature range * Available in 16-pin (3mm x 3mm) MLFTM package Functional Block Diagram Applications * * * * All SONET and GigE clock distribution Fibre Channel applications Backplane distribution High-end, low skew, multiprocessor synchronous clock distribution Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. July 2005 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Ordering Information(1) Part Number SY89851UMG SY89851UMGTR(2) Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. Package Type MLF-16 MLF-16 Operating Range Industrial Industrial Package Marking 851U with Pb-Free bar-line indicator 851U with Pb-Free bar-line indicator Lead Finish Pb-Free NiPdAU Pb-Free NiPdAu Pin Configuration 16-Pin MLFTM (MLF-16) July 2005 2 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Pin Description Pin Number 1,4 Pin Name IN, /IN Pin Function Differential Inputs: This input pair is the differential signal input to the device. Inputs accept AC- or DC-coupled signals as small as 100mV (200mVpp). Each pin terminates to a VT pin through 50. Note that these inputs will default to an indeterminate state if left open. Please refer to the "Input Interface Applications" section for more details. Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT pins provide a center-tap to a termination network for maximum interface flexibility. See "Input Interface Applications" section for more details. Reference Voltage: This output biases to VCC-1.2V. It is used when ACcoupling the inputs (IN, /IN). For AC-coupled applications, connect VREF-AC to the VT pin and bypass with a 0.01F low ESR capacitor to VCC. Maximum sink/source current is 1.5mA. See "Input Interface Applications" section for more details. Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitors and place as close to each VCC pin as possible. Differential Outputs: These 100K LVPECL-compatible output pairs are the precision, low skew copies of the inputs. Unused output pairs may be left open. Terminate with 50 to VCC-2V. See "LVPECL Output Interface Application" section for more details. Ground. GND and exposed pad must both be connected to the same ground plane. 2 VT 3 VREF-AC 5,8,13,16 12,11 9,10 VCC Q0, /Q0, Q1, /Q1 6,7,14,15 GND, Exposed Pad July 2005 3 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Absolute Maximum Ratings(1) Supply Voltage (VCC) ..........................-0.5V to +4.0V Input Voltage (IN, /IN) .............................-0.5V to VCC LVPECL Output Current (IOUT) Continuous ............................................... 50mA Surge...................................................... 100mA Termination Current Source or sink current on VT .................. 100mA VREF-AC Current Source or sink current ............................... 2mA Input Current Source or sink current on IN, /IN.............. 50mA Lead Temperature (soldering, 20sec.) ...........+260C Storage Temperature (Ts)..................-65C to 150C Operating Ratings(2) Supply Voltage (VCC).................. +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 MLFTM (JB) Junction-to-Board .................................... 33C/W DC Electrical Characteristics(4) TA = -40C to +85C, unless otherwise stated. Symbol VCC ICC RIN RDIFF_IN VIH VIL VIN VDIFF_IN VT_IN VREF-AC Notes: 1. Permanent device damage may occur if the 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 ratings 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. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. JA and JB values are for a 4-layer board in still air, unless otherwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 5. VIH(min) not lower than 1.2V Parameter Power Supply Power Supply Current Single-Ended 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| IN-to-VT (IN, /IN) Output Reference Voltage VCC -1.3 VCC -1.2 See Figure 1a. See Figure 1b. Note 5 No load, max. VCC 45 90 VCC -1.6 0 0.1 0.2 1.28 VCC -1.1 Condition Min 2.375 3.0 Typ 2.5 3.3 32 50 100 Max 2.625 3.6 45 55 110 VCC VIH-0.1 1.7 Units V V mA V V V V V V July 2005 4 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U 100K LVPECL Output DC Electrical Characteristics(6) VCC = 2.5V 5% or 3.3V 10%; TA = -40C to + 85C; RL = 50 to VCC -2V, unless otherwise stated. Symbol VOH VOL VOUT VDIFF_OUT Note: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Parameter 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. Condition Min VCC-1.145 VCC-1.945 550 1100 800 1600 Typ Max VCC-0.895 VCC-1.695 Units V V mV mV July 2005 5 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U AC Electrical Characteristics(7) VCC = 2.5V 5% or 3.3V 10%, RL = 50 to VCC -2V, VIN 100mV (200mVPP); TA = -40C to + 85C, unless otherwise stated. Symbol fMAX tpd tpd Tempco tSKEW Parameter Maximum Operating Frequency Differential Propagation Delay tpd Temperature Coefficient Output-to-Output Skew Part-to-Part Skew Data Random Jitter tJITTER Deterministic Jitter Clock Cycle-to-Cycle Jitter Total Jitter tr, tf Notes: 7. 8. 9. High-frequency AC-parameters are guaranteed by design and characterization. Output-to-output skew is measured between two different outputs under identical input transitions. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the respective inputs. Output Rise/Fall Time (20% to 80%) Note 12 Note 13 At full output swing 50 100 1 10 180 psRMS psPP ps Note 10 Note 11 1 10 psRMS psPP Note 8 Note 9 Condition NRZ Data Clock IN-to-Q Min 2.5 3 140 Typ 3.5 4 220 130 6 20 120 340 Max Units Gbps GHz ps fs/C ps ps 10. Random jitter is measured with a K28.7 character pattern, measured at 2.5Gbps. 11. Deterministic jitter is measured at 2.5Gbps, with both K28.5 and 223 - 1 PRBS pattern. 12. Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, Tn - Tn-1 where T is the time between rising edges of the output signal. 13. Total jitter definition: with an ideal clock input of frequency 6 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Typical Operating Characteristics VCC = 3.3V, GND = 0V, VIN = 100mV (200mVPP), RL = 50 to VCC -2V, TA = 25C, unless otherwise stated. July 2005 7 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Functional Characteristics VCC = 3.3V, GND = 0V, VIN = 100mV (200mVPP), RL = 50 to VCC -2V, TA = 25C, unless otherwise stated. July 2005 8 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Single-Ended and Differential Swings Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing Timing Diagrams Input and Output Stages Figure 2a. Simplified Differential Input Stage Figure 2b. Simplified LVPECL Output Stage July 2005 9 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Input Interface Applications Optional: may connect VT to VCC Figure 3a. LVPECL Interface (DC-Coupled) Figure 3b. LVPECL Interface (AC-Coupled) Figure 3c. CML Interface (DC-Coupled) Figure 3d. CML Interface (AC-Coupled) Figure 3e. LVDS Interface July 2005 10 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U LVPECL Output Interface Applications LVPECL has high input impedance, very low output (open emitter) impedance, and small signal swing which result in low EMI. LVPECL is ideal for driving 50- and 100-controlled impedance transmission lines. There are several techniques for terminating the LVPECL output including: Parallel TerminationThevenin Equivalent, Parallel Termination (3Resistor), and AC-Coupled Termination. Unused output pairs may be left floating. However, singleended outputs must be terminated, or balanced. Figure 4a. Parallel Thevenin-Equivalent Termination Figure 4b. Parallel Termination (3-Resistor) Related Product and Support Documentation Part Number SY58012U Function 5GHz, 1:2 LVPECL Fanout Buffer/Translator with Internal Input Termination MLFTM Application Note HBW Solutions New Products and Applications Data Sheet Link www.micrel.com/product-info/products/sy58012u.shtml www.amkor.com/products/notes_papers/MLF_AppNote.pdf www.micrel.com/product-info/products/solutions.shtml July 2005 11 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89851U Package Information 16-Pin MicroLeadFrameTM (MLF-16) Package Notes: 1. 2. 3. Package meets Level 2 Moisture Sensitivity Classification. All parts are dry-packaged before shipment. Exposed pad must be soldered to a ground for proper thermal management. MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. 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 the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. July 2005 12 M9999-071205 hbwhelp@micrel.com or (408) 955-1690 |
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