® Micrel, Inc. Precision Edge ULTRA-PRECISION 1:8 FANOUT SY58033U ® BUFFER WITH 400mV LVPECL OUTPUTS Precision Edge SY58033U AND INTERNAL TERMINATION FEATURES ■ Precision 1:8, 400mV LVPECL fanout buffer ■ Guaranteed AC performance over temperature and voltage: • Clock frequency range: DC to 5.5GHz • <80ps tr / tf times • <280ps tpd • <20ps skew ■ Low-jitter performance: • <10psPP total jitter (clock) • <1psRMS random jitter (data) ■ 100k LVPECL compatible outputs ■ Fully differential inputs/outputs ■ Accepts an input signal as low as 100mV ■ Unique input termination and VT pin accepts DC-coupled 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 SY58033U is a 2.5V/3.3V precision, high-speed, fully differential 400mV LVPECL 1:8 fanout buffer. The SY58033U 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 5.5GHz. The differential input includes Micrel’s unique, 3-pin input termination architecture that allows the SY58033U to directly interface to LVPECL, CML, and LVDS differential signal (ACor DC-coupled) without any level-shifting or termination resistor networks in the signal path. The result is a clean, stub-free, low-jitter solution. The LVPECL (100k temperature compensated) outputs feature a 400mV typical swing into 50Ω loads, and provide an extremely fast rise/fall time guaranteed to be less than 80ps. The SY58033U 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). Other high-speed 1:8 fanout buffers include the CML SY58031U and the 800mV LVPECL SY58032U. The SY58033U is part of Micrel’s highspeed, Precision Edge® product line. All support documentation can be found on Micrel’s web site at www.micrel.com. APPLICATIONS ■ ■ ■ ■ FUNCTIONAL BLOCK DIAGRAM 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 Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-020707 [email protected] or (408) 955-1690 /Q7 Rev.: C 1 Amendment: /0 Issue Date: February 2007 Precision Edge® SY58033U Micrel, Inc. PACKAGE/ORDERING INFORMATION VCC Q0 /Q0 Q1 /Q1 Q2 /Q2 VCC Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish SY58033UMI MLF-32 Industrial SY58033U Sn-Pb SY58033UMITR(2) MLF-32 Industrial SY58033U Sn-Pb SY58033UMG(3) MLF-32 Industrial SY58033U with Pb-Free bar-line indicator Pb-Free NiPdAu SY58033UMGTR(2, 3) MLF-32 Industrial SY58033U with Pb-Free bar-line indicator Pb-Free NiPdAu 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) Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. 3. Pb-Free package 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 400mV LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The LVPECL output swing is typically 400mV into 50Ω. Unused output pairs may be left floating with no impact on jitter. See “LVPECL Output” section. 5 VREF-AC M9999-020707 [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 (approx.), 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® SY58033U 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. 180 250 mA VIH Input HIGH Voltage IN, /IN VCC–1.2 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–1.545 VCC–1.295 V VOUT Output Voltage Swing see Figure 1a. 150 400 mV VDIFF_OUT Differential Voltage Swing see Figure 1b. 300 800 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 table after thermal equilibrium has been established. M9999-020707 [email protected] or (408) 955-1690 3 Precision Edge® SY58033U 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 ≥ 200mV tpd Propagation Delay tpd tempco Differential Propagation Delay Temperature Coefficient tSKEW Output-to-Output Skew (within device) Note 8 Part-to-Part Skew tJITTER tr, tf Min Clock (IN-to-Q) Typ Max 5.5 Units GHz 130 200 280 35 fs/°C 20 ps Note 9 100 ps Cycle-to-Cycle Note 10 1 psRMS Total Jitter (Clock) Note 11 10 psPP Random Jitter (RJ) Note 12 1 psRMS 80 ps Clock Output Rise/Fall Time 7 ps 20% to 80%, at full output swing. 20 50 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 conditions. 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 800mV (Typ.) VIN, VOUT 400mV (Typ.) Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing TIMING DIAGRAM /IN VIN IN tPD tPD /Q VOUT Q M9999-020707 [email protected] or (408) 955-1690 4 Precision Edge® SY58033U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 200MHz Output Output Swing (100mV/div.) Output Swing (100mV/div.) 2GHz Output TIME (600ps/div.) TIME (70ps/div.) Output Swing (100mV/div.) 5GHz Output TIME (25ps/div.) 450 ∆ Output-to-Output Skew Amplitude vs. Frequency vs. Temperature 3.0 2.5 350 300 ∆ SKEW (ps) AMPLITUDE (mV) 400 250 200 150 100 2.0 1.5 1.0 0.5 50 V = 200mV IN 0 -4000 1000 6000 0.0 -50 -30 -10 10 30 50 70 90 110 11000 TEMPERATURE (°C) FREQUENCY (MHz) 235.5 200.0 199.5 199.0 198.5 235.0 234.5 SKEW (ps) PROPAGATION DELAY (ps) 200.5 Propagation Delay vs. Temperature Propagation Delay vs. Input Swing 198.0 197.5 197.0 196.5 196.0 195.5 0 234.0 233.5 233.0 232.5 232.0 200 400 600 800 231.5 -50 -30 -10 10 30 50 70 90 110 1000 TEMPERATURE (°C) INPUT SWING (mV) M9999-020707 [email protected] or (408) 955-1690 5 Precision Edge® SY58033U 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 VCC IN LVPECL /IN IN IN CML SY58033U CML GND /IN /IN VCC SY58033U GND NC NC VREF-AC SY58033U GND VREF-AC VREF-AC VT VCC 0.01µF VT Rpd VT 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 /IN SY58033U GND SY58033U VREF-AC GND GND For 3.3V, Rpd = 100Ω For 2.5V, Rpd = 50Ω VT NC VREF-AC NC VT VCC Figure 3d. AC-Coupled LVPECL Input Interface M9999-020707 [email protected] or (408) 955-1690 Figure 3e. LVDS Input Interface 6 Figure 3c. LVPECL Input Interface Precision Edge® SY58033U Micrel, Inc. LVPECL OUTPUT LVPECL has high input impedance, and very low output impedance (open emitter), and small signal swing which results in low electromagnetic interference (EMI). LVPECL is ideal for driving 50Ω and 100Ω controlled impedance transmission lines. There are several techniques in terminating the LVPECL output, which are the Parallel Termination-Thevenin Equivalent, the Parallel Termination (3-Resistor), and the AC-Coupled Termination. Unused output pairs may be left floating. However, single-ended 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 “source” 50Ω 50Ω “destination” VCC Rb C1 (optional) 0.01µF 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. 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 M9999-020707 [email protected] or (408) 955-1690 7 Precision Edge® SY58033U Micrel, Inc. 32-PIN MicroLeadFrame® (MLF-32) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane PCB Thermal Consideration for 32-Pin MLF® Package (Always solder, or equivalent, the exposed pad to the PCB) Package Notes: 1. Package meets Level 2 qualification. 2. All parts are dry-packaged before shipment. 3. Exposed pads 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. M9999-020707 [email protected] or (408) 955-1690 8