Micrel, Inc. ULTRA-PRECISION 1:8 FANOUT BUFFER WITH LVPECL OUTPUTS AND INTERNAL TERMINATION Precision Edge® SY58032U ® Precision Edge SY58032U FEATURES ■ Precision 1:8, LVPECL fanout buffer ■ Guaranteed AC performance over temperature and voltage: • Clock frequency range: DC to 4GHz • <110ps tr / tf times • <330ps tpd • <20ps skew ■ Low-jitter performance: • <10psPP total jitter (clock) • <1psRMS random jitter ■ 100k LVPECL compatible outputs ■ Fully differential inputs/outputs ■ Accepts an input signal as low as 100mV ■ Unique input termination and VT pin accepts DCcoupled and AC-coupled differential inputs: (LVPECL, LVDS, and CML) ■ Power supply 2.5V ±5% or 3.3V ±10% ■ Industrial temperature range: –40°C to +85°C ■ Available in 32-pin (5mm × 5mm) MLF™ package Precision Edge® DESCRIPTION The SY58032U is a 2.5V/3.3V precision, high-speed, fully differential LVPECL 1:8 fanout buffer. The SY58032U is optimized to provide eight identical output copies with less than 20ps of skew and less than 10psPP total jitter. It can process clock signals as fast as 4GHz. The differential input includes Micrel’s unique, 3-pin input termination architecture that allows the SY58032U to directly interface to LVPECL, CML, and LVDS differential signals (AC- or DC-coupled) without any level-shifting or termination resistor networks in the signal path. The result is a clean, stub-free, low-jitter interface solution. The LVPECL (100k temperature compensated) outputs feature 800mV typical swing into 50Ω loads, and provide an extremely fast rise/fall time guaranteed to be less than 110ps. The SY58032U operates from a 2.5V ±5% supply or 3.3V ±10% supply and is guaranteed over the full industrial temperature range (–40°C to +85°C). For applications that require a higher high-speed 1:8 fanout buffer, consider the SY58031U or SY58033U. The SY58032U is part of Micrel’s high-speed, Precision Edge® product line. All support documentation can be found on Micrel’s web site at www.micrel.com. FUNCTIONAL BLOCK DIAGRAM APPLICATIONS ■ ■ ■ ■ All SONET and all GigE clock distribution All Fibre Channel clock and data distribution Network routing engine timing distribution High-end, low-skew multiprocessor synchronous clock distribution Q0 /Q0 Q1 /Q1 Q2 /Q2 IN Q3 50Ω VT /Q3 50Ω /IN Q4 /Q4 VREF-AC Q5 /Q5 Q6 /Q6 Q7 /Q7 Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. M9999-072205 [email protected] or (408) 955-1690 Rev.: C 1 Amendment: /0 Issue Date: July 2005 Precision Edge® SY58032U Micrel, Inc. PACKAGE/ORDERING INFORMATION VCC Q0 /Q0 Q1 /Q1 Q2 /Q2 VCC Ordering Information(1) 32 31 30 29 28 27 26 25 VCC GND IN VT VREF-AC /IN GND VCC 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 GND VCC Q3 /Q3 Q4 /Q4 VCC GND VCC /Q7 Q7 /Q6 Q6 /Q5 Q5 VCC 9 10 11 12 13 14 15 16 32-Pin MLF™ (MLF-32) Part Number Package Type Operating Range Package Marking Lead Finish SY58032UMI MLF-32 Industrial SY58032U Sn-Pb SY58032UMITR(2) MLF-32 Industrial SY58032U Sn-Pb SY58032UMG(3) MLF-32 Industrial SY58032U with Pb-Free bar-line indicator Pb-Free NiPdAu SY58032UMGTR(2, 3) MLF-32 Industrial SY58032U with Pb-Free bar-line indicator Pb-Free NiPdAu Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. 3. Recommended for new designs. PIN DESCRIPTION Pin Number Pin Name 3, 6 IN, /IN 4 VT Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a center-tap for each input (IN, /IN) to the termination network for maximum interface flexibility. See “Input Interface Applications” section. 2, 7, 17, 24 GND, Exposed Pad Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. 1, 8, 9, 16, 18, 23, 25, 32 VCC Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors as close to the pins as possible. 31, 30, 29, 28, 27, 26, 22, 21, 20, 19, 15, 14, 13, 12, 11, 10 Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5, Q6, /Q6, Q7, /Q7 100k LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The LVPECL output swing is typically 800mV into 50Ω. Unused output pairs may be left floating with no impact on jitter. See “LVPECL Output” section. 5 VREF-AC M9999-072205 [email protected] or (408) 955-1690 Pin Function Differential Signal Input: Each pin of this pair internally terminates with 50Ω to the VT pin. Note that this input will default to an indeterminate state if left open. See “Input Interface Applications” section. Bias Reference Voltage: Equal to VCC–1.2V (typical), and used for AC-coupled applications. See “Input Interface Applications” section. When using VREF-AC, bypass with 0.01µF capacitor to VCC. Maximum sink/source current is 0.5mA. 2 Precision Edge® SY58032U Micrel, Inc. Absolute Maximum Ratings(1) Operating Ratings(2) Power Supply Voltage (VCC ) ...................... –0.5V to +4.0V Input Voltage (VIN) ......................................... –0.5V to VCC Current (VT) Source or sink current on VT pin ........................ ±100mA Input Current (VT) Source or sink current on IN, /IN .......................... ±50mA Current (VREF) Source or sink current on VREF-AC(3) ....................... ±1.5mA Lead Temperature Soldering, (20 sec.) .................... 260°C Storage Temperature Range (TS ) ........... –65°C to +150°C Power Supply Voltage (VCC) ................. +2.375V to +3.60V Ambient Temperature Range (TA) ............. –40°C to +85°C Package Thermal Resistance(4) MLF™ (θJA) Still-Air ............................................................. 35°C/W MLF™ (ψJB) Junction-to-Board ............................................ 20°C/W DC ELECTRICAL CHARACTERISTICS(5) TA= –40°C to +85°C Symbol Parameter Condition Min Typ Max Units VCC Power Supply Voltage 2.5V nominal 3.3V nominal 2.375 3.0 2.5 3.3 2.625 3.6 V V ICC Power Supply Current VCC = max. No load. Includes current through 50Ω pull-ups. 190 250 mA VIH Input HIGH Voltage IN, /IN; Note 6. VCC–1.6 VCC V VIL Input LOW Voltage IN, /IN 0 VIH–0.1 V VIN Input Voltage Swing IN, /IN, see Figure 1a. 0.1 1.7 V VDIFF_IN Differential Input Voltage Swing |IN0, /IN0|, |IN1, /IN1| IN, /IN, see Figure 1b. 0.2 RIN In-to-VT Resistance VT IN Max. In-to-VT (IN, /IN) 40 VREF-AC V 50 60 Ω 1.28 V VCC–1.3 VCC–1.2 VCC–1.1 V LVPECL DC ELECTRICAL CHARACTERISTICS(5) VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min Typ Max Units VOH Output HIGH Voltage VCC–1.145 VCC–0.895 V VOL Output LOW Voltage VCC–1.945 VCC–1.695 V VOUT Output Voltage Swing see Figure 1a. 500 800 VDIFF_OUT Differential Voltage Swing see Figure 1b. 1000 1600 mV 2000 mV 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 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. Due to the limited drive capability, use for input of the same package only. 4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential (GND) on the PCB. ψJB uses 4-layer θJA in still-air number unless otherwise stated. 5. The circuit is designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established. 6. VIH (min) not lower than 1.2V. M9999-072205 [email protected] or (408) 955-1690 3 Precision Edge® SY58032U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition fMAX Maximum Operating Frequency VOUT ≥ 400mV tpd Propagation Delay tpd tempco Differential Propagation Delay Temperature Coefficient tSKEW Output-to-Output Skew (within Device) Note 8 Part-to-Part Skew Clock tJITTER tr, tf Min Clock Typ Max 4 (IN-to-Q) 180 Units GHz 260 330 35 fs/°C 20 ps Note 9 100 ps Cycle-to-Cycle Jitter Note 10 1 psRMS Total Jitter (Clock) Note 11 10 psPP Random Jitter (RJ) Note 12 1 psRMS 110 ps Output Rise/Fall Time 7 ps 20% to 80%, at full output swing. 35 75 Notes: 7. High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50Ω to VCC – 2V, VIN ≥ 100mV. 8. Output-to-output skew is measured between outputs under identical transitions. 9. 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. Part-to-part skew includes variation in tpd. 10. 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. 11. Total jitter definition: with an ideal clock input of frequency ≤ fMAX, no more than one output edge in 1012 output edges will deviate by more than the specified peak-to-peak jitter value. 12. Random jitter is measured with a K28.7 comma detect character pattern, measured at 1.25Gbps and 2.5Gbps. SINGLE-ENDED AND DIFFERENTIAL SWINGS VDIFF_IN, VDIFF_OUT 1.6V (Typ.) VIN, VOUT 800mV (Typ.) Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing TIMING DIAGRAM /IN VIN IN tpd tpd /Q VOUT Q M9999-072205 [email protected] or (408) 955-1690 4 Precision Edge® SY58032U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA= 25°C, unless otherwise stated. 200MHz Output Output Swing (200mV/div.) Output Swing (200mV/div.) 1.25GHz Output TIME (600ps/div.) TIME (100ps/div.) Output Swing (200mV/div.) 4GHz Output TIME (30ps/div.) ∆ Output-to-Output Skew Amplitude vs. Frequency 900 2.5 vs. Temperature 2 700 ∆ SKEW (ps) 600 500 400 300 200 1 0 -60 -40 -20 0 8000 7000 6000 5000 3000 2000 1000 0 1.5 0.5 100 V = 400mV IN 0 4000 AMPLITUDE (mV) 800 20 40 60 80 100 TEMPERATURE (°C) FREQUENCY (MHz) 235.5 PROPAGATION DELAY (ps) PROPAGATION DELAY (ps) 265 Propagation Delay vs. Input Swing 260 255 250 245 240 235 230 0 200 400 600 800 VIN = 800mV 234.5 234 233.5 233 232.5 232 231.5 -60 -40 -20 0 1000 20 40 60 80 100 TEMPERATURE (°C) INPUT SWING (mV) M9999-072205 [email protected] or (408) 955-1690 235 Propagation Delay vs. Temperature 5 Precision Edge® SY58032U Micrel, Inc. INPUT BUFFER VCC IN 50Ω VT GND 50Ω /IN Figure 2. Simplified Differential Input Buffer INPUT INTERFACE APPLICATIONS VCC VCC VCC VCC VCC IN VCC LVPECL /IN IN IN SY58032U CML CML /IN /IN SY58032U GND NC NC VCC GND SY58032U GND 0.01µF VREF-AC VREF-AC VT VT VREF-AC VCC VT 0.01µF Rpd For 2.5V, Rpd = 19Ω For 3.3V, Rpd = 50Ω Figure 3a. DC-Coupled CML Input Interface Figure 3b. AC-Coupled CML Input Interface Option: May connect VT to VCC . VCC VCC VCC VCC IN LVPECL IN /IN Rpd Rpd LVDS SY58032U GND /IN SY58032U VREF-AC GND For 3.3V, Rpd = 100Ω For 2.5V, Rpd = 50Ω VT GND NC VREF-AC NC VT VCC Figure 3d. AC-Coupled LVPECL Input Interface M9999-072205 [email protected] or (408) 955-1690 Figure 3e. LVDS Input Interface 6 Figure 3c. LVPECL Input Interface Precision Edge® SY58032U Micrel, Inc. LVPECL OUTPUT LVPECL has high input impedance, and very low output impedance (open emitter), and small signal swing which results in low EMI. LVPECL is ideal for driving 50Ω and 100Ω controlled impedance transmission lines. There are several techniques for terminating the LVPECL output: Parallel Termination-Thevenin Equivalent, Parallel Termination (3-resistor), and AC-coupled Termination. Unused output pairs may be left floating. However, singleended outputs must be terminated, or balanced. +3.3V +3.3V ZO = 50Ω R1 130Ω R1 130Ω R2 82Ω R2 82Ω +3.3V ZO = 50Ω For +2.5V systems, R1 = 250Ω, R2 = 62.5Ω VT = VCC —2V Figure 4. Parallel Termination-Thevenin Equivalent +3.3V +3.3V Z = 50Ω Z = 50Ω 50Ω 50Ω “source” “destination” VCC Rb C1 (optional) Notes: 0.01µF 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. 4. For 2.5V systems, Rb = 19Ω, For 3.3V systems, Rb = 50Ω Figure 5. Parallel Termination (3-Resistor) RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION Part Number Function Data Sheet Link SY58031U Ultra-Precision 1:8 Fanout Buffer with 400mV CML Outputs and Internal I/O Termination http://www.micrel.com/product-info/products/sy58031u.shtml SY58032U Ultra-Precision 1:8 Fanout Buffer with LVPECL Outputs and Internal Termination http://www.micrel.com/product-info/products/sy58032u.shtml SY58033U Ultra-Precision 1:8 Fanout Buffer with 400mV LVPECL Outputs and Internal Termination http://www.micrel.com/product-info/products/sy58033u.shtml 32-MLF™ Manufacturing Guidelines Exposed Pad Application Note www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf HBW Solutions http://www.micrel.com/product-info/as/solutions.shtml M9999-072205 [email protected] or (408) 955-1690 7