Micrel, Inc. Precision Edge 5.5GHz 1:4 FANOUT BUFFER/ ® Precision Edge SY58022U translator w/400mV LVPECL SY58022U OUTPUTS AND INTERNAL INPUT TERMINATION ® FEATURES ■ Precision 1:4, 400mV LVPECL fanout buffer ■ Guaranteed AC performance over temperature and voltage: • > 5.5GHz fMAX clock • < 80ps tr/tf times • < 250ps (VIN ≥ 300mV) 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 DC- and AC-coupled differential inputs: LVPECL, LVDS and CML ■ 400mV LVPECL compatible outputs ■ Power supply 2.5V ±5% and 3.3V ±10% ■ –40°C to +85°C temperature range ■ Available in 16-pin (3mm × 3mm) MLF® package Precision Edge® DESCRIPTION The SY58022U is a 2.5V/3.3V precision, high-speed, fully differential 1:4 LVPECL fanout buffer. Optimized to provide four identical output copies with less than 15ps of skew and less than 10psPP total jitter, the SY58022U can process clock signals as fast as 5.5GHz. The differential input includes Micrel’s unique, 3-pin input termination architecture interfaces to differential LVPECL, CML, and LVDS signals (AC- 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 400mV LVPECL compatible, with extremely fast rise/fall times guaranteed to be less than 80ps. The SY58022U 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 greater output swing or CML compatible outputs, consider the SY58021U 1:4 fanout buffer with LVPECL outputs, or the SY58020U 1:4 fanout buffer with 400mV CML outputs. The SY58022U is part of Micrel’s high-speed, Precision Edge® product line. All data sheets and support documentation can be found on Micrel’s web site at: www. micrel.com. APPLICATIONS ■ ■ ■ ■ ■ All SONET and All GigE clock distribution Fibre Channel clock and data distribution Backplane distribution Data distribution: OC-48, OC-48+FEC, XAUI High-end, low-skew, multiprocessor synchronous clock distribution TYPICAL Performance Functional block diagram Q0 IN 50Ω VT 50Ω /IN /Q0 Q1 /Q1 VREF-AC Q2 /Q2 Q3 /Q3 Precison Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. 1 Rev.: E Amendment: /1 Issue Date: June 2009 Precision Edge® SY58022U Micrel, Inc. GND Q0 /Q0 VCC PACKAGE/ORDERING INFORMATION 16 15 14 13 Ordering Information(1) /Q1 VREF-AC 3 10 Q2 /IN 4 9 /Q2 5 6 7 8 Q3 Q1 11 VCC 12 2 /Q3 1 GND IN VT Part Number SY58022UMI SY58022UMITR Package Type Operating Range Package Marking Lead Finish MLF-16 Industrial 022U Sn-Pb MLF-16 Industrial 022U Sn-Pb SY58022UMG MLF-16 Industrial 022U with Pb-Free bar-line indicator Pb-Free NiPdAu SY58022UMGTR(2) MLF-16 Industrial 022U with Pb-Free bar-line indicator Pb-Free NiPdAu (2) Notes: 1. Contact factory for die availability. Die are guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. 16-Pin MLF® (MLF-16) PIN DESCRIPTION Pin Number Pin Name Pin Function 1, 4 IN, /IN Differential Input: This input pair receives the signal to be buffered. Each pin is internally terminated 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 the 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 to differentail inputs. Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR capacitor to VCC. See “Input Interface Applications” section. 8, 13 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the pins as possible. A 0.01µF capacitor should be as close to the VCC pin as possible. 5, 16 Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. 14, 15 11, 12 9, 10 6, 7 GND, Exposed Pad /Q0, Q0, /Q1, Q1, /Q2, Q2, /Q3, Q3, LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The output swing is typically 400mV. Proper termination is 50Ω to VCC–2V at the receiving end. Unused output pairs may be left floating with no impact on jitter or skew. See “LVPECL Output Termination” section. 2 Precision Edge® SY58022U 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 Output Current (IOUT) Continuous.............................................................. 50mA Surge..................................................................... 100mA VT Current Source or sink current on VT pin.......................... ±100mA Input Current Source or sink current on (IN, /IN)......................... ±50mA VREF Current Source or sink current on VREF-AC, Note 4.............. ±1.5mA Soldering, (20 sec.).................................................... 260°C Storage Temperature Range (TSTORE )........... –65 to +150°C Power Supply Voltage (VCC)................... +2.375V to +3.60V Operating Temperature Range (TA)............. –40°C to +85°C Package Thermal Resistance MLF® (θJA) Still-Air.......................................................................................................... 60°C/W 500lpfm........................................................................................................ 54°C/W MLF® (θJB) (Junction-to-Board Resistance), Note 3 ........ 33°C/W DC ELECTRICAL CHARACTERISTICS(Note 5) TA = –40°C to +85°C Symbol Parameter Condition Min Typ Max Units Power Supply Voltage VCC VCC = 2.5V VCC = 3.3V 2.375 3.0 2.5 3.3 2.625 3.60 V V ICC Power Supply Current No load, VCC = max 125 160 mA VIH Input HIGH Voltage IN, /IN, Note 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 3.6 V VDIFF_IN Differential Input Voltage IN, /IN; See Figure 1b 0.2 3.4 V RIN IN-to-VT Resistance 40 60 Ω VREF-AC Output Reference Voltage VT IN IN-to-VT Voltage VCC–1.6 50 VCC–1.3 VCC–1.2 VCC–1.1 1.28 V V LVPECL DC Electrical CharacteristicS(Note 5) VCC = 3.3V ±10% or VCC = 2.5 ±5%; 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–1.020VCC–0.895 V VOL Output LOW Voltage VCC–1.545 VCC–1.420VCC–1.295 V VOUT Output Differential Swing see Figure 1a 150 400 650 mV VDIFF_OUT Differential Output Swing see Figure 1b 300 800 1300 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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. 4. Due to the limited drive capability, use for input of the same package only. 5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 6. VIH (min.) not lower than 1.2V. 3 Precision Edge® SY58022U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS 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 fMAX Maximum Operating Frequency VOUT ≥ 200mV 5.5 GHz 10 Gbps Clock NRZ Data tpd Propagation Delay 200 280 ps tCHAN Channel-to-Channel Skew Note 7 4 15 ps tSKEW Part-to-Part Skew Note 8 50 ps tJITTER Clock Note 9 1 psRMS Total Jitter Note 10 10 psPP Random Jitter Note 11 2.5Gbps – 3.2Gbps 1 psRMS Deterministic Jitter Note 12 2.5Gbps – 3.2Gbps 10 psPP 80 ps Cycle-to-Cycle Jitter Data tr, tf Output Rise/Fall Time 20% to 80% At full swing 130 20 50 Notes: 7. Skew is measured between outputs of the same bank under identical transitions. 8. 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. 9. 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. 10. 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. 11. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps/3.2Gbps. 12. Deterministic jitter is measured at 2.5Gbps/3.2Gbps with both K28.5 and 223–1 PRBS pattern. TIMING DIAGRAM /IN IN /Q Q tpd Single-Ended and Differential SwingS VDIFF_IN, VDIFF_OUT 800mV VIN, VOUT 400mV Figure 1b. Differential Swing Figure 1a. Single-Ended Swing 4 Precision Edge® SY58022U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 3.3V, VEE = 0V, VIN = 100mV, TA = 25°C, unless otherwise stated. 3.5 450 400 3.0 2.5 SKEW (ps) 350 300 250 200 150 100 2.0 1.5 1.0 203 PROPAGATION DELAY (ps) FREQUENCY (MHz) 0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE(°C) 12000 10000 8000 6000 4000 0.5 2000 50 0 0 AMPLITUDE (mV) 500 Skew vs. Temperature Progation Delay vs. Temperature 202 201 200 199 198 197 196 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE(°C) 5 Propagtion Delay vs. Input Voltage Swing 215 PROPAGATION DELAY (ps) Amplitude vs. Frequency 210 205 200 195 0 200 400 600 800 1000 1200 INPUT VOLTAGE SWING (mV) Precision Edge® SY58022U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 3.3V, VEE = 0V, VIN = 100mV, TA = 25°C, unless otherwise stated. 6 Precision Edge® SY58022U Micrel, Inc. Input Stage VCC IN GND 50Ω VT 50Ω /IN Figure 2. Simplified Differential Input Buffer INPUT INTERFACE APPLICATIONS VCC VCC VCC VCC LVPECL LVPECL /IN /IN SY58022U Rpd Rpd NC IN SY58022U Rpd LVDS /IN VT VT 0.01µF VCC VCC IN IN VREF-AC VREF-AC 0.01µF VCC SY58022U NC VT NC VREF-AC For VCC = 2.5V, Rpd =19Ω. For VCC = 3.3V, Rpd =50Ω. Figure 3a. DC-Coupled LVPECL Input Interface VCC VCC Figure 3b. AC-Coupled LVPECL Input Interface VCC VCC IN IN CML CML /IN /IN SY58022U NC VT NC VREF-AC SY58022U VT VREF-AC 0.01μF (Option: May connect VT to VCC) Figure 3d. AC-Coupled CML Input Interface VCC Figure 3e. CML Input Interface 7 Figure 3c. LVDS Input Interface Precision Edge® SY58022U Micrel, Inc. Output TERMINATION RECOMMENDATIONS LVPECL outputs have very low output impedance (open emitter), and small signal swing which results in low EMI (electro-magnetic interference). The LVPECL is ideal for driving 50Ω- and 100Ω-controlled impedance transmission lines. In addition, LVPECL is compatible for driving standard PECL inputs since PECL inputs require only 100mV input swing. Further, there are several techniques in terminating the LVPECL outputs, as shown in Figure 4 through 6. +3.3V +3.3V VT = VCC -1.3V +3.3V +3.3V SY58022U ZO =50Ω R1 130Ω R1 130Ω +3.3V /Q VT = VCC -2V R2 82Ω VT = VCC -2V Figure 6. Terminating Unused I/O Figure 4. Parallel Termination–Thevenin Equivalent Notes: 1. Unused output (/Q) must be terminated to balance the output. 2. 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. 3. Unused output pairs (Q and /Q) may be left floating. Notes: 1. For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω. 2. For +3.3V systems: R1 = 130Ω, R2 = 83Ω. SY58022U +3.3V Q SY58022U ZO =50Ω R2 82Ω +3.3V +3.3V +3.3V Z =50Ω Z =50Ω 50Ω “source” 50Ω 50Ω Rb “destination” C1 0.01µF (optional) 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 = 19Ω. For +3.3V systems Rb = 46Ω to 50Ω. 4. 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 SY58020U 6GHz, 1:4 CML Fanout Buffer/Translator Internal I/O Termination http://www.micrel.com/product-info/prod/ucts/sy58020u.shtml SY58021U 4GHz, 1:4 LVPECL Fanout Buffer/Translator with Internal Termination http://www.micrel.com/product-info/products/sy58021u.shtml SY58022U 5.5GHz, 1:4 Fanout Buffer/Translator w/400mV LVPECL Outputs and Internal Input Termination http://www.micrel.com/product-info/products/sy58022u.shtml 16-MLF® Manufacturing Guidelines Exposed Pad Application Note www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf M-0317 HBW Solutions http://www.micrel.com/product-info/as/solutions.shtml 8 Precision Edge® SY58022U Micrel, Inc. 16-PIN MicroLeadFrame® (mlf-16) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation Heavy Copper Plane Heavy Copper Plane VEE VEE PCB Thermal Consideration for 16-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 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, Inc. 9