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: • 76fsRMS phase jitter (typ) ■ 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 x 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 only 76fsRMS phase 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 50ý 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 registered trademarks of Amkor Technology, Inc. M9999-072810 [email protected] or (408) 955-1690 1 Rev.: E Amendment: /0 Issue Date: July 2010 Precision Edge® SY58032U Micrel, Inc. PACKAGE/ORDERING INFORMATION VCC Q0 /Q0 Q1 /Q1 Q2 /Q2 VCC Ordering Information(1) 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 10 11 12 13 14 15 16 GND VCC Q3 /Q3 Q4 /Q4 VCC GND VCC /Q7 Q7 /Q6 Q6 /Q5 Q5 VCC VCC GND IN VT VREF-AC /IN GND VCC 32 31 30 29 28 27 26 25 32-Pin MLF® (MLF-32) Part Number SY58032UMI SY58032UMITR Package Type Operating Range Package Marking Lead Finish MLF-32 Industrial SY58032U Sn-Pb MLF-32 Industrial SY58032U Sn-Pb SY58032UMG(3) MLF-32 Industrial SY58032U with Pb-Free bar-line indicator Pb-Free NiPdAu MLF-32 Industrial SY58032UMGTR(2, 3) SY58032U with Pb-Free bar-line indicator Pb-Free NiPdAu (2) 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 Pin Function 3, 6 IN, /IN Differential Signal Input: Each pin of this pair internally terminates with 50ý to the VT pin. Note that this input will default to an indeterminate state if left open. See “Input Interface Applications” section. 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 Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. GND, Exposed Pad 1, 8, 9, 16, VCC 18, 23, 25, 32 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 5 VREF-AC M9999-072810 [email protected] or (408) 955-1690 Positive Power Supply: Bypass with 0.1µF||0.01µF low ESR capacitors as close to the pins as possible. 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. 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 Power Supply Voltage VCC 2.5V nominal 3.3V nominal Power Supply Current ICC VCC = max. No load. Includes current through 50ý pull-ups. Min Typ Max Units 2.375 3.0 2.5 3.3 2.625 3.6 V V 190 250 mA VIH Input HIGH Voltage IN, /IN, Note 6 VIL Input LOW Voltage IN, /IN VCC–1.6 VCC V 0 VIH–0.1 V VIN Input Voltage Swing VDIFF_IN Differential Input Voltage Swing |IN0, /IN0|, |IN1, /IN1| IN, /IN, see Figure 1a. 0.1 1.7 IN, /IN, see Figure 1b. 0.2 V RIN In-to-VT Resistance VT IN Max. In-to-VT (IN, /IN) 40 60 Ω 1.28 V 50 VCC–1.3 VCC–1.2 VCC–1.1 VREF-AC V V LVPECL DC Electrical Characteristics(5) VCC = 2.5V ±5% or 3.3V ±10%; RL = 50ý to VCC–2V; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Max Units VOH Output HIGH Voltage Condition VCC–1.145 Min Typ VCC–0.895 V VOL Output LOW Voltage VCC–1.945 VCC–1.695 VOUT Output Voltage Swing see Figure 1a. 500 800 mV VDIFF_OUT Differential Voltage Swing see Figure 1b. 1000 1600 mV 2000 V 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. M9999-072810 [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 = 50ý to VCC–2V; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter fMAX Maximum Operating Frequency Condition VOUT ≥ 400mV Clock (IN-to-Q) Min Typ Max Units 4 GHz 180 260 330 tpd Propagation Delay tpd tempco Differential Propagation Delay Temperature Coefficient 35 tSKEW Output-to-Output Skew (within Device) 7 20 ps Part-to-Part Skew Note 9 100 ps Note 8 ps fs/°C RMS Phase Jitter tJITTER Output = 622MHZ Integration Ranger 12kHz - 20MHz 76 fs tr, tf 20% to 80%, at full output swing. 75 ps Output Rise/Fall Time 35 110 Notes: 7. High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50ý 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. Phase Noise RMS Phase Jitter (Random) 12kHz to 20MHz = 76fs (Typical) Phase Noise Plot: 622MHz @ 3.3V M9999-072810 [email protected] or (408) 955-1690 4 Precision Edge® SY58032U Micrel, Inc. 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 M9999-072810 [email protected] or (408) 955-1690 5 Precision Edge® SY58032U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA= 25°C, unless otherwise stated. ∆ Output-to-Output Skew 2.5 vs. Temperature ∆ SKEW (ps) 2 1.5 1 0.5 0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) M9999-072810 [email protected] or (408) 955-1690 6 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 VCC SY58032U CML CML /IN /IN SY58032U NC /IN IN IN GND NC VREF-AC GND 0.01mF VCC GND SY58032U VREF-AC VT VT Figure 3a. DC-Coupled CML Input Interface Option: May connect VT to VCC . VCC Figure 3b. AC-Coupled CML Input Interface VCC VCC IN LVPECL IN /IN LVDS SY58032U Rpd GND /IN SY58032U VREF-AC GND For 3.3V, Rpd = 100W For 2.5V, Rpd = 50W VT GND NC VREF-AC NC VT VCC Figure 3d. AC-Coupled LVPECL Input Interface M9999-072810 [email protected] or (408) 955-1690 Figure 3e. LVDS Input Interface 7 VREF-AC VCC VT 0.01mF Rpd For 2.5V, Rpd = 19W For 3.3V, Rpd = 50W VCC Rpd IN LVPECL 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, 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 Rb “destination” VCC 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,For3.3Vsystems,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 M9999-072810 [email protected] or (408) 955-1690 8 Precision Edge® SY58032U Micrel, Inc. 32-pin MicroLeadFrame® (mlf-32) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation Heavy Copper Plane Heavy Copper Plane VEE VEE 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. M9999-072810 [email protected] or (408) 955-1690 9