® 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 Low-jitter performance: • 76fsRMS phase jitter (typ) Guaranteed AC performance over temperature and voltage: • Clock frequency range: DC to 5.5GHz • <80ps tr / tf times • <280ps tpd • <20ps skew 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) QFN 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 only 76fsRMS phase 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 (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 solution. The LVPECL (100k temperature compensated) outputs feature a 400mV typical swing into 50 ohms 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 Precision Edge is a registered trademark of Micrel, Inc. M9999-072810 [email protected] or (408) 955-1690 1 Rev.: F Amendment: /0 Issue Date: October 2011 Precision Edge® SY58033U Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information(1) 32-Pin QFN (QFN-32) Part Number Package Type Operating Range Package Marking SY58033UMG(3) QFN-32 Industrial Pb-Free SY58033U with Pb-Free bar-line indicator Industrial SY58033UMGTR(2, 3) QFN-32 Pb-Free SY58033U with Pb-Free bar-line indicator Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only. All devices are Pb-Free. 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 50Ω 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. 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. 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) QFN (θJA) Still-Air.............................................................. 35°C/W QFN (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 ICC Power Supply Current VCC = max. No. load includes current through 50Ω pull-ups. VIH Input HIGH Voltage IN, /IN, Note 6 Input LOW Voltage IN, /IN VIN Input Voltage Swing IN, /IN, see Figure 1a. 0.1 VDIFF_IN Differential Input Voltage Swing |IN0, /IN0|, |IN1, /IN1| IN, /IN, see Figure 1b. 0.2 V RIN In-to-VT Resistance 40 60 Ω 1.28 V VIL VT IN Min Typ Max Units 2.375 3.0 2.5 3.3 2.625 3.6 V V 180 250 mA VCC V 1.7 V VCC–1.6 0 50 Max. In-to-VT (IN, /IN) VIH–0.1 VCC–1.3 VCC–1.2VCC–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 VOH VOL VOUT VDIFF_OUT Parameter Condition Output HIGH Voltage Min Typ VCC–1.145 Output LOW Voltage Output Voltage Swing see Figure 1a. Differential Voltage Swing see Figure 1b. VCC–1.545 Max Units VCC–0.895 V VCC–1.295 V 150 400 mV 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. 6. VIH (min) not lowers than 1.2V. M9999-072810 [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 = 50ý to VCC–2V; TA = –40°C to +85°C, unless otherwise stated. Symbol fMAX tpd tpd tempco Parameter Maximum Operating Frequency Propagation Delay Condition VOUT ≥ 200mV Min Typ Max Units Clock 5.5 GHz (IN-to-Q) 130 200 280 ps Differential Propagation Delay Temperature Coefficient 35 fs/°C Output-to-Output Skew(within device) tSKEW Part-to-Part Skew tJITTER RMS Phase Jitter Note 8 7 20 Note 9 100 Output = 622MHz Integration Range 12kHz - 20MHz 76 ps ps tr, tf 20% to 80%, at full output swing. ps Output Rise/Fall Time 20 50 80 fs Notes: 7. High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50Ω to VCC–2V, VIN ž 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. 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® SY58033U Micrel, Inc. Single-Ended and Differential SwingS Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing Timing Diagram M9999-072810 [email protected] or (408) 955-1690 5 Precision Edge® SY58033U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. M9999-072810 [email protected] or (408) 955-1690 6 Precision Edge® SY58033U Micrel, Inc. INPUT BUFFER Figure 2. Simplified Differential Input Buffer INPUT INTERFACE APPLICATIONS Figure 3a. DC-Coupled CML Input Interface Figure 3b. AC-Coupled CML Input Interface Option: May connect VT to VCC . Figure 3d. AC-Coupled LVPECL Input Interface M9999-072810 [email protected] or (408) 955-1690 Figure 3e. LVDS Input Interface 7 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. Figure 4. Parallel Termination-Thevenin Equivalent 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® SY58033U Micrel, Inc. 32-pin QFN (QFN-32) PCB Thermal Consideration for 32-Pin QFN 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