Micrel, Inc. Precision Edge® 6GHz, 1:2 FANOUT BUFFER/translator Precision Edge ® SY58013U w/400mV LVPECL OUTPUTS and INTERNAL SY58013U INPUT TERMINATION FEATURES ■ Precision 1:2, 400mV LVPECL fanout buffer ■Low jitter performance: • 55fsRMS phase jitter (typ) ■ Accepts an input signal as low as 100mV ■ Guaranteed AC performance over temperature and voltage: • > 6GHz fMAX clock • < 80ps tr/tf times • < 250ps tpd • < 15ps max. skew ■ Unique input termination and VT pin accepts DC-coupled 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 x 3mm) QFN package Precision Edge® DESCRIPTION The SY58013U 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 only 55fsRMS phase jitter, the SY58013U can process clock signals as fast as 6GHz or data patterns up to 10.7Gbps. The differential input includes Micrel’s unique, 3-pin input termination architecture that interfaces to LVPECL, LVDS, and CML differential 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 (VREFAC) 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 SY58013U 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 SY58012U 1:2 fanout buffer with 800mV LVPECL outputs, or the SY58011U 1:2 fanout buffer with 400mV CML outputs. The SY58013U is part of Micrel’s high-speed, Precision Edge® product line. Datasheets 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 Backplanes Data distribution: OC-48, OC-48+FEC, XAUI High-end, low-skew, multiprocessor synchronous clock distribution TYPICAL Performance Functional block diagram 2GHz with 100mV Input Precison Edge is a registered trademark of Micrel, Inc. M9999-063010 [email protected] or (408) 955-1690 1 Rev.: F Amendment: /0 Issue Date: November 2011 Precision Edge® SY58013U Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information(1) Package Operating Package Part Number Type Range Marking (3) SY58013UMG QFN-16 Industrial 013U with Pb-Free Pb-Free bar-line indicator (2, 3) QFN-16 Industrial Pb-Free SY58013UMGTR 16-Pin QFN 013U 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 1, 4 IN, /IN Differential Input: This input pair is the signal to be buffered. Each pin is internally terminated with 50 ohms 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 for AC-coupled inputs (IN, /IN). Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR capacitor to VCC. Maximum curent 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) 12, 11 Q0, /Q0, 9, 10 Q1, /Q1 M9999-063010 [email protected] or (408) 955-1690 Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The output swing is typically 400mV. Unused output pairs may be left floating with no impact on jitter. See “LVPECL Output Termination” section. 2 Precision Edge® SY58013U 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 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, Note 3 QFN (θJA) Still-Air............................................................................. 60°C/W 500lpfm. .......................................................................... 54°C/W QFN (ψJB).......................................................................... 33°C/W DC ELECTRICAL CHARACTERISTICS(Note 5) TA= –40°C to +85°C Symbol VCC ICC Parameter Condition Min Power Supply Voltage Power Supply Current Typ Max 2.375 Max. VCC, no load 3.60 V 90 mA VCC V 1.7 V 75 VIH Input HIGH Voltage IN, /IN, Note 6 Input LOW Voltage IN, /IN VIN Input Voltage Swing IN, /IN; see Figure 1a 0.1 Differential Input Voltage IN, /IN; see Figure 1b 0.2 VIL VDIFF_IN RIN VREF-AC VCC–1.6 0 In to VT Resistance 40 Units VIH–0.1 50 60 Output Reference Voltage VCC –1.3 VCC –1.2 VCC –1.1 1.28 IN to VT V V ohms V V LVPECL DC Electrical CharacteristicS(Note 5) VCC = 3.3V ±10% or VCC = 2.5 ±5%; RL= 50ohms to VCC–2V; TA= –40°C to 85°C, unless otherwise stated. Symbol VOH VOL VOUT VDIFF_OUT Parameter Condition Min Output HIGH Voltage Q0, /Q0, Q1, /Q1 Output LOW Voltage Q0, /Q0, Q1, /Q1 Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1a Differential Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1b Typ Max VCC–1.145 VCC–1.020VCC–0.895 VCC–1.545 VCC–1.420VCC–1.295 Units V V 200 400 mV 400 800 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. M9999-063010 [email protected] or (408) 955-1690 3 Precision Edge® SY58013U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(Note 7) VCC = 2.5V ±5% or 3.3V ±10%; TA = –40°C to +85°C; RL = 50ohms to VCC–2V, unless otherwise stated. Symbol Parameter fMAX Maximum Operating Frequency tpd Propagation Delay VIN x 100mV 100 Channel-to-Channel Skew tCHAN tSKEW Part-to-Part Skew tJITTER Random Jitter Note 8 4 15 Note 9 100 Output = 622MHz 55 Integration Range: 12kHz-20MHz ps ps fs tr, tf Output Rise/Fall Time 20% to 80%, at full output swing 20 ps Condition Min NRZ Data VOUT x 200mV Clock Typ Max Units 10 Gbps 6 GHz 180 50 250 80 ps 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. PhaseDIAGRAM Noise TIMING M9999-063010 [email protected] or (408) 955-1690 4 Precision Edge® SY58013U Micrel, Inc. TIMING DIAGRAM Single-Ended and Differential SwingS Figure 1b. Differential Voltage Swing Figure 1a. Single-Ended Voltage Swing M9999-063010 [email protected] or (408) 955-1690 5 Precision Edge® SY58013U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. M9999-063010 [email protected] or (408) 955-1690 6 Precision Edge® SY58013U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 3.3V, VEE = 0V, VIN = 100mV, TA = 25°C, unless otherwise stated. (223–1 PRBS Pattern) M9999-063010 [email protected] or (408) 955-1690 7 Precision Edge® SY58013U Micrel, Inc. Input Stage Figure 2. Simplified Differential Input Buffer INPUT INTERFACE APPLICATIONS Figure 3a. DC-Coupled LVPECL Input Interface Figure 3b. AC-Coupled LVPECL Input Interface Figure 3d. DC-Coupled CML Input Interface Figure 3e. AC-Coupled CML Input Interface (option: may connect VT to VCC) M9999-063010 [email protected] or (408) 955-1690 8 Figure 3c. LVDS Input Interface Precision Edge® SY58013U 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 50 ohms and 100 ohms 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. Figure 4. Parallel Termination–Thevenin Equivalent Figure 6. Terminating Unused I/O Note 1. Unused output (/Q) must be terminated to balance the output. Note 2. For +2.5V systems: R1 = 250 ohms, R2 = 62.5 ohms, R3 = 1.25k ohms, R4 = 1.2k ohms. For +3.3V systems: R1 = 130 ohms, R2 = 82 ohms, R3 = 1k ohms, R4 = 1.6k ohms. Note 3. Unused output pairs (Q and /Q) may be left floating. Note 1. For +2.5V systems: R1 = 250 ohms, R2 = 62.5 ohms Note 2. For +3.3V systems: R1 = 130 ohms, R2 = 82 ohms Figure 5. Three-Resistor “Y–Termination” Note 1. Power-saving alternative to Thevenin termination. Note 2. Place termination resistors as close to destination inputs as possible. Note 3. Rb resistor sets the DC bias voltage, equal to VT. For +2.5V systems Rb = 39 ohms. For +3.3V systems Rb = 46 ohms to 50 ohms. Note 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 SY58011U 7GHz, 1:2 CML Fanout Buffer/Translator With Internal I/O Termination http://www.micrel.com/product-info/prod/ucts/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 Input Termination 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 M-0317 HBW Solutions http://www.micrel.com/product-info/as/solutions.shtml M9999-063010 [email protected] or (408) 955-1690 9 Precision Edge® SY58013U Micrel, Inc. 16-PIN QFN (QFN-16) PCB Thermal Consideration for 16-Pin QFN 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 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, Incorporated. M9999-063010 [email protected] or (408) 955-1690 10