® Micrel, Inc. Precision Edge 5GHz, 1:2 LVPECL FANOUT ® SY58012U Precision Edge BUFFER/TRANSLATOR SY58012U WITH INTERNAL INPUT TERMINATION FEATURES Precision 1:2, 800mV LVPECL fanout buffer Guaranteed AC performance over temperature/ voltage: • > 5GHz fMAX (clock) Precision Edge® DESCRIPTION • < 110ps tr / tf times • < 260ps tpd • < 15ps max skew Low jitter performance • < 10psPP total jitter (clock) • < 1psRMS random jitter (data) • < 10psPP deterministic jitter (data) Accepts an input signal as low as 100mV Unique input termination and VT pin accepts DCand AC-coupled differential inputs: LVPECL, LVDS, and CML Outputs are 100k LVPECL compatible, 800mV swing Power supply 2.5V ±5% and 3.3V ±10% –40°C to +85°C temperature range Available in 16-pin (3mm × 3mm) MLF® package The SY58012U is a 2.5V/3.3V precision, high-speed, fully differential 1:2 LVPECL fanout buffer. Optimized to provide two identical output copies with less than 15ps of skew and less than 10ps(pk-pk) total jitter, the SY58012U can process clock signals as fast as 5GHz or 5Gbps data. The differential input includes Micrel’s unique, 3-pin input termination architecture that interfaces to LVPECL, LVDS or CML differential signals, (AC-coupled or DC-coupled) as small as 100mV without any level-shifting or termination resistor networks in the signal path. For AC-coupled input interface applications, an on-board output reference voltage (VREF-AC) is provided to bias the VT pin. The outputs are 100k LVPECL compatible, with extremely fast rise/fall times guaranteed to be less than 110ps. The SY58012U 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 faster rise/fall times, or greater bandwidth, consider the SY58013U 1:2 fanout buffer with 400mV output swing, or the SY58011 1:2 CML (400mV) fanout buffer. The SY58012U is part of Micrel’s high-speed, Precision Edge® product line. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. APPLICATIONS ■ ■ ■ ■ All SONET and GigE clock distribution Fibre Channel clock and data distribution Backplane distribution High-end, low skew, multiprocessor synchronous clock distribution FUNCTIONAL BLOCK DIAGRAM TYPICAL PERFORMANCE 2.5GHz Output VCC = 3.3V 50Ω Output Swing (200mV/div.) Q0 IN /Q0 VT 50Ω /IN Q1 /Q1 VREF-AC TIME (50ps/div.) 2GHz with 100mV Input Precision Edge is registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-051408 [email protected] or (408) 955-1690 Rev.: F 1 Amendment: /0 Issue Date: May 2008 Precision Edge® SY58012U Micrel, Inc. VCC GND GND VCC PACKAGE/ORDERING INFORMATION 16 15 14 13 Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish 012U Sn-Pb SY58012UMI MLF-16 Industrial /Q0 SY58012UMITR(2) MLF-16 Industrial 012U Sn-Pb VREF-AC 3 10 /Q1 SY58012UMG(3) MLF-16 Industrial /IN 4 9 Q1 012U with Pb-Free bar-line indicator Pb-Free NiPdAu SY58012UMGTR(2, 3) MLF-16 Industrial 012U with Pb-Free bar-line indicator Pb-Free NiPdAu 5 6 7 8 VCC Q0 11 GND 12 2 VCC 1 GND IN VT 16-Pin MLF® (MLF-16) 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 1, 4 IN, /IN Differential Input: This input pair is the signal to be buffered. 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. 2 VT Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a center-tap for each input (IN, /IN) to a termination network for maximum interface flexibility. See “Input Interface Applications” section. 3 VREF-AC Reference Output Voltage: This output biases to VCC –1.2V. It is used when AC-coupling the inputs (IN, /IN). Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR capacitor to VCC. Maximum current source or sink is 0.5mA. See “Input Interface Applications” section. 5, 8, 13, 16 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the VCC pins as possible. 6, 7, 14, 15 GND, Exposed Pad Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. 12, 11 9, 10 Q0, /Q0, Q1, /Q1 M9999-051408 [email protected] or (408) 955-1690 Pin Function LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The output swing is typically 800mV. Unused output pairs may be left floating with no impact on jitter. See “LVPECL Output Termination” section. 2 Precision Edge® SY58012U Micrel, Inc. Absolute Maximum Ratings(Note 1) Operating Ratings(Note 2) Power Supply Voltage (VCC ) ...................... –0.5V to +4.0V Input Voltage (VIN) ......................................... –0.5V to VCC LVPECL Output Current (IOUT) Continuous ............................................................. 50mA Surge .................................................................... 100mA Source or sink current on VT pin VT Current .......................................................... ±100mA Source or sink current on IN, /IN Input Current ........................................................ ±50mA Source or sink current on VREF-AC, Note 4 VREF Current ....................................................... ±1.5mA Soldering, (20 seconds) ............................................ 260°C Storage Temperature Range (TSTORE ) ... –65°C to +150°C Power Supply Voltage (VCC) ..................... 2.375V to 3.60V Operating Temperature Range (TA) ........... –40°C to +85°C Package Thermal Resistance, Note 3 MLF® (θJA) Still-Air ............................................................. 60°C/W 500 lpfm ........................................................... 54°C/W MLF® (ψJB) .......................................................... 33°C/W INPUT DC ELECTRICAL CHARACTERISTICS(Note 5) Symbol Parameter Condition Min VCC Power Supply Voltage ICC Power Supply Current Max. VCC, no load VIH Input HIGH Voltage IN, /IN, Note 6 VIL Input LOW Voltage IN, /IN VIN Input Voltage Swing VDIFF_IN Differential Input Voltage Swing RIN In to VT Resistance Typ Max Units 3.60 V 80 mA VCC–1.6 VCC V 0 VIH –0.1 V IN, /IN; see Figure 1a 0.1 1.7 V IN,/IN; see Figure 1b 0.2 2.375 55 40 V 60 Ω 1.28 V VCC –1.2 VCC–1.1 V Typ Max Units 50 IN to VT VREF-AC Output Reference Voltage VCC–1.3 LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS(Note 5) VCC = 3.3V ±10% or 2.5 ±5%; RL= 50Ω to VCC–2V; TA= –40°C to 85°C, unless otherwise stated. Symbol Parameter Condition Min VOH Output HIGH Voltage Q0, /Q0, Q1, /Q1 VCC–1.145 VCC–0.895 V VOL Output LOW Voltage Q0, /Q0, Q1, /Q1 VCC–1.945 VCC–1.695 V VOUT Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1a 550 800 mV VDIFF_OUT Differiential Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1b 1100 1600 mV Note 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 Note 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. Note 3. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the pcb. Note 4. Due to the limited drive capability, use for input of the same package only. Note 5. The circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been established. Note 6. VIH (min) not lower than 1.2V. M9999-051408 [email protected] or (408) 955-1690 3 Precision Edge® SY58012U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(Note 7) VCC = 2.5V ±5% or 3.3V ±10%; TA = –40°C to +85°C; RL = 50Ω to VCC–2V, unless otherwise stated. Symbol Parameter Condition fMAX Maximum Operating Frequency Min NRZ Data VOUT ≥ 400mV tpd Propagation Delay VIN ≥ 100mV tCHAN Channel-to-Channel Skew Note 8 tSKEW Part-to-Part Skew tJITTER Data Max 5 Gbps 5 GHz 260 ps 3 15 ps Note 9 100 ps Random Jitter (RJ) Deterministic Jitter (DJ) Note 10 Note 11 1 10 psRMS psPP Cycle-to-Cycle Jitter Total Jitter (TJ) Note 12 Note 13 1 10 psRMS psPP 110 ps Output Rise/Fall Time 110 Units 170 Clock tr, tf Clock Typ 20% to 80% at full output swing 35 80 Note 7. High frequency AC Electricals are guaranteed by design and characterization. Note 8. Skew is measured between outputs of the same bank under identical transitions. Note 9. 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. Note 10. RJ is measured with a K28.7 comma detect character pattern, measured at 10.7Gbps and 2.5Gbps/3.2Gbps. Note 11. DJ is measured at 10.7Gbps and 2.5Gbps/3.2Gbps with both K28.5 and 223–1 PRBS pattern Note 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. Note 13. 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. TIMING DIAGRAM /IN IN /Q Q tpd SINGLE-ENDED AND DIFFERENTIAL SWINGS VIN, VOUT VDIFF_IN, VDIFF_OUT Typ. 1.6V Typ. 800mV Figure 1b. Differential Voltage Swing Figure 1a. Single-Ended Voltage Swing M9999-051408 [email protected] or (408) 955-1690 4 Precision Edge® SY58012U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 10 Frequency vs. Amplitude WITHIN-DEVICE SKEW (ps) 800 AMPLITUDE (mV) 700 600 500 400 300 200 9000 8000 7000 6000 5000 4000 3000 2000 0 0 1000 100 Within-Device Skew vs. Temperature 9 8 7 6 5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) FREQUENCY (MHz) Propagation Delay vs. Input Voltage Swing Propagaton Delay vs. Temperature PROPAGATION DELAY (ps) PROPAGATION DELAY (ps) 190 185 180 175 170 165 160 155 0 200 400 600 800 1000 INPUT VOLTAGE SWING (V) M9999-051408 [email protected] or (408) 955-1690 5 195 190 185 180 175 170 165 160 155 150 145 140 135 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) Precision Edge® SY58012U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 5GHz Output Output Swing (200mV/div.) Output Swing (100mV/div.) 200MHz Output TIME (25ps/div.) TIME (600ps/div.) Output Swing (150mV/div.) 5Gbps Output TIME (50ps/div.) (223–1 PRBS Pattern) M9999-051408 [email protected] or (408) 955-1690 6 Precision Edge® SY58012U Micrel, Inc. INPUT STAGE VCC IN 50Ω VT GND 50Ω /IN Figure 2. Simplified Differential Input Buffer INPUT INTERFACE APPLICATIONS VCC VCC VCC VCC IN IN LVPECL LVDS /IN /IN SY58012U Rpd VREF-AC Rpd Figure 3a. LVPECL Input Interface VCC VCC VT NC VT VREF-AC NC VREF-AC VCC Note: For VCC = 3.3V system, Rpd = 100Ω For VCC = 2.5V system, Rpd = 50Ω Figure 3b. AC-Coupled LVPECL Input Interface VCC VCC IN IN CML CML /IN /IN SY58012U SY58012U NC VT NC VREF-AC VT VREF-AC 0.1µF VCC Figure 3d. DC-Coupled CML Input Interface Figure 3e. AC-Coupled CML Input Interface (option: may connect VT to VCC) M9999-051408 [email protected] or (408) 955-1690 SY58012U Rpd 0.01µF NC Note: For VCC = 2.5V systems, Rpd = 19Ω. For VCC = 3.3V systems, Rpd = 50Ω. /IN SY58012U VT VCC IN LVPECL 0.01µF VCC VCC 7 Figure 3c. LVDS Input Interface Precision Edge® SY58012U Micrel, Inc. LVPECL OUTPUT LVPECL output have 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 in terminating the LVPECL output, as shown in Figures 5 through 7. +3.3V* +3.3V +3.3V* ZO = 50Ω R1 130Ω R1 130Ω +3.3V +3.3V* Q +3.3V R1 130Ω R1 130Ω V = VCC —1.3V R4 T +3.3V 1kΩ ZO = 50Ω ZO = 50Ω /Q R2 82Ω R2 82Ω VT = VCC —2V R2 82Ω Figure 5. Parallel Termination-Thevenin Equivalent Note 1. Note 2. Note 1. Note 2. +3.3V Z = 50Ω R2 82Ω Figure 7. Terminating Unused I/O For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω For +3.3V systems: R1 = 130Ω, R2 = 82Ω +3.3V R3 1.6kΩ VT = VCC —2V Note 3. Unused output (/Q) must be terminated to balance the output. For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω, R3 = 1.25kΩ, R4 = 1.2kΩ. For +3.3V systems: R1 = 130Ω, R2 = 82Ω, R3 = 1kΩ, R4 = 1.6kΩ. Unused output pairs (Q and /Q) may be left floating. Z = 50Ω 50Ω 50Ω source destination 50Ω Rb C1 0.01µF (optional) Figure 6. Three-Resistor “Y–Termination” Note 1. Note 2. Note 3. Note 4. Power-saving alternative to Thevenin termination. Place termination resistors as close to destination inputs as possible. Rb resistor sets the DC bias voltage, equal to VT. For +2.5V systems Rb = 19Ω. For +3.3V systems Rb = 46Ω to 50Ω. C1 is an optional bypass capacitor intended to compensate for any tr/tf mismatches. RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION Part Number Function Data Sheet Link SY58011U 7GHz, 1:2 CML Fanout Buffer/Translator With Internal Input Termnations http://www.micrel.com/product-info/products/sy58011u.shtml SY58012U 5GHz, 1:2 LVPECL Fanout Buffer/Translator With Internal Input Termination http://www.micrel.com/product-info/products/sy58012u.shtml SY58013U 6GHz, 1:2 Fanout Buffer/Translator w/400mV LVPECL Outputs and Internal Terminations http://www.micrel.com/product-info/products/sy58013u.shtml 16-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 M-0317 M9999-051408 [email protected] or (408) 955-1690 8 Precision Edge® SY58012U Micrel, Inc. 16-PIN MicroLeadFrame® (MLF-16) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane PCB Thermal Consideration for 16-Pin MLF® Package (Always solder, or equivalent, the exposed pad to the PCB) Package Notes: Note 1. Package meets Level 2 qualification. Note 2. All parts are dry-packaged before shipment. Note 3. Exposed pads must be soldered to a ground for proper thermal management. MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA http://www.micrel.com 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. 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. M9999-051408 [email protected] or (408) 955-1690 9