Micrel, Inc. 6GHz, 1:4 CML FANOUT BUFFER/TRANSLATOR WITH INTERNAL I/O TERMINATION Precision Edge® ® SY58020U Precision Edge SY58020U FEATURES - Precision 1:4, 400mV CML fanout buffer - Low jitter performance: • 116fsRMS phase jitter (typ) - Guaranteed AC performance over temperature/ voltage: • > 6GHz fMAX clock • < 60ps tr / tf times • < 250ps tpd • < 15ps max. skew - 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 - 50ohms source terminated CML outputs - Power supply 2.5V ±5% and 3.3V ±10% - Industrial temperature range: –40°C to +85°C - Available in 16-pin (3mm * 3mm) QFN package Precision Edge® DESCRIPTION The SY58020U is a 2.5V/3.3V precision, high-speed, fully differential 1:4 CML fanout buffer. Optimized to provide four identical output copies with less than 15ps of skew and only 116fsRMS phase jitter, the SY58020U can process clock signals as fast as 6GHz. The differential input includes Micrel’s unique, 3-pin input termination architecture interfaces to differential LVPECL, LVDS, and CML 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 optimized to drive 400mV typical swing into 50ohms loads, with extremely fast rise/fall times guaranteed to be under 60ps. The SY58020U 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 LVPECL outputs, consider the SY58021U or SY58022U 1:4 fanout buffer with 800mV and 400mV output swing, respectively. The SY58020U is part of Micrel’s highspeed, 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 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 FUNCTIONAL BLOCK DIAGRAM TYPICAL PERFORMANCE Q0 IN 50Ω /Q0 VT VREF-AC Q1 /Q1 50Ω /IN Q2 /Q2 Q3 /Q3 Precision Edge is a registered trademark of Micrel, Inc. M9999-102811 [email protected] or (408) 955-1690 Rev.: C 1 Amendment: /0 Issue Date: October 2011 Precision Edge® SY58020U Micrel, Inc. Q0 VCC 16 /Q0 GND PACKAGE/ORDERING INFORMATION 15 14 13 Ordering Information(1) VT 2 11 /Q1 VREF-AC 3 10 Q2 /IN 4 9 /Q2 5 6 7 8 VCC Q1 Q3 12 /Q3 1 GND IN 16-Pin QFN (QFN-16) Package Type Operating Range SY58020UMG QFN-16 Pb-Free Industrial 020U with Pb-Free bar-line indicator SY58020UMGTR(2) QFN-16 Pb-Free Industrial 020U with Pb-Free bar-line indicator Part Number Package Marking 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. PIN DESCRIPTION Pin Number Pin Name 1, 4 IN, /IN 2 VT 3 VREF-AC 8, 13 VCC Positive Power Supply: Bypass with 0.1μF//0.01μF low ESR capacitors as close to the pins as possible. 5, 16 GND, Exposed Pad 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 /Q0, Q0, /Q1, Q1, /Q2, Q2, /Q3, Q3, M9999-102811 [email protected] or (408) 955-1690 Pin Function Differential Input: This input pair receives the signal to be buffered. Each pin of this pair internally terminates with 50ohms to the VT pin. Note that this input will default to an indeterminate state if left open. See “Input Interface Applications” section. 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. Reference Output Voltage: This output biases to VCC –1.2V. It is used when AC-coupling to differential inputs. Connect VREF-AC directly to the VT pin. Bypass with 0.01μF low ESR capacitor to VCC. See “Input Interface Applications” section. CML Differential Output Pairs: Differential buffered output copy of the input signal. The output swing is typically 400mV into 50ohms load. Normally terminate CML output pairs with 100ohms across Q and /Q outputs at the receiving end. Unused output pairs may be left floating with no impact on jitter or skew. See “CML Output Termination” section. 2 Precision Edge® SY58020U 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 CML Output Voltage (VOUT) ........... VCC–1.0V to VCC+0.5V Current (VT) Source or sink current on VT pin........................ ±100mA Input Current Source or sink current on IN, /IN ......................... ±50mA Current (VREF) Source or sink current on VREF-AC, Note 4 ........ ±1.5mA Lead Temperature Soldering, (20 seconds) ............. 260°C Storage Temperature Range (TSTORE) ... –65°C to +150°C Supply Voltage (VCC) ............................ +2.375V to +3.60V Operating Temperature Range (TA) .......... –40°C to +85°C Package Thermal Resistance QFN (θJA) Still-Air ............................................................ 60°C/W 500lfpm ........................................................... 54°C/W QFN (ψJB) (Junction-to-Board Resistance), Note 3 ......... 33°C/W DC ELECTRICAL CHARACTERISTICS(Notes 5) TA = –40°C to +85°C Symbol Parameter Condition Min Typ Max Units VCC Power Supply Voltage 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. (includes internal 50ohms pull-up) 150 180 mA VIH Input HIGH Voltage Note 6 VCC–1.6 VCC V VIL Input LOW Voltage 0 VIH–0.1 V VIN Input Voltage Swing See Figure 1a 0.1 1.7 V VDIFF_IN Differential Input Voltage Swing See Figure 1b 0.2 3.4 V RIN IN-to-VT Resistance 60 ohms VREF-AC Output Reference Voltage VT IN IN-to-VT Voltage 40 50 VCC –1.3 VCC –1.2 VCC –1.1 1.28 V V CML DC ELECTRICAL CHARACTERISTICS(Notes5) VCC = 3.3V ±10% or 2.5V ±5%; RL = 100ý across each output pair or equivalent; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min VOH Output HIGH Voltage VOUT Output Voltage Swing see Figure 1a 325 VDIFF_OUT Differential Output Voltage Swing see Figure 1b ROUT Output Source Impedance Typ Max Units VCC V 400 500 mV 650 800 1000 mV 40 50 60 ohms VCC –0.020 VCC –0.010 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. M9999-102811 [email protected] or (408) 955-1690 3 Precision Edge® SY58020U Micrel, Inc. AC ELECTIRCAL CHARACTERISTICS VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C; RL = 100ohms across each output pair or equivalent, unless otherwise stated. Symbol Parameter Condition Min fMAX Maximum Operating Frequency VOUT • 200mV Clock Propagation Delay tCHAN Channel-to-Channel Skew Note 7 tSKEW Part-to-Part Skew Note 8 tJITTER RMS Phase Jitter Output = 622MHz Integration Range: 12kHz - 20MHz tr, tf Output Rise/Fall Time 20% to 80% At full swing Max 6 NRZ Data tpd Typ GHz 10 110 Gbps 180 260 ps 4 15 ps 50 ps 116 20 Units 40 fs(rms) 60 Note 7. Skew is measured between outputs of the same bank under identical transitions. Note 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. PHASE NOISE Noise Power (dBc/Hz) RMS PHase Jitter (Random) 12kHz to 20MHz = 116fs (Typical) OFFSET FREQUENCY (Hz) Phase Noise Plot: 622MHz @ 3.3V M9999-102811 [email protected] or (408) 955-1690 4 ps Precision Edge® SY58020U Micrel, Inc. TIMING DIAGRAM /IN IN /Q Q tpd SINGLE-ENDED AND DIFFERENTIAL SWINGS VDIFF_IN, VDIFF_OUT 800mV VIN, VOUT 400mV Figure 1a. Single-Ended Voltage Swing M9999-102811 [email protected] or (408) 955-1690 Figure 1b. Differential Voltage Swing 5 Precision Edge® SY58020U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 500 7 6 5 SKEW (ps) 350 300 250 200 150 100 3 FREQUENCY (MHz) 0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 12000 10000 8000 6000 1 4000 0 50 0 4 2 2000 AMPLITUDE (V) 450 400 Skew vs. Temperature PROPAGATION DELAY (ps) 184 Propagation Delay vs. Temperature 183 182 181 180 179 178 177 176 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) M9999-102811 [email protected] or (408) 955-1690 6 Propagation Delay vs. Input Voltage Swing 195 PROPAGATION DELAY (ps) Amplitude vs. Frequency 190 185 180 175 170 165 0 200 400 600 800 1000 1200 INPUT VOLTAGE SWING (mV) Precision Edge® SY58020U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 5GHz Output Amplitude (100mV/div.) Amplitude (100mV/div.) 200MHz Output TIME (25ps/div.) M9999-102811 [email protected] or (408) 955-1690 TIME (600ps/div.) 7 Precision Edge® SY58020U 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 CML IN CML /IN NC VT NC VREF-AC LVDS /IN SY58020U VT VREF-AC (Option: May connect VT to VCC) Figure 3a. DC-Coupled CML Input Interface VCC VCC Figure 3b. AC-Coupled CML Input Interface VCC VCC LVPECL /IN /IN SY58020U Rpd SY58020U Rpd VT VT Rpd NC VREF-AC VREF-AC 0.01μF For VCC = 2.5V, Rpd = 19Ω For VCC = 3.3V, Rpd = 50Ω Figure 3d. LVPECL Input Interface M9999-102811 [email protected] or (408) 955-1690 SY58020U NC VT NC VREF-AC VCC IN IN LVPECL /IN SY58020U 0.01μF 0.01μF VCC VCC VCC Rpd = 100Ω for a 3.3V system Rpd = 50Ω for a 2.5V system Figure 3e. AC-Coupled LVPECL Input Interface 8 Figure 3c. LVDS Input Interface Precision Edge® SY58020U Micrel, Inc. CML OUTPUT TERMINATION Figures 4 and 5 illustrate how to terminate a CML output using both the AC-coupled and DC-coupled configuration. All outputs of the SY58020U are 50ý with a 16mA current source. VCC 9 50Ω 50Ω 9 Q 100Ω 9 9 /Q 16mA GND Figure 5. CML AC-Coupled Termination Figure 4. CML DC-Coupled RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION Part Number Function Data Sheet Link SY58020U 6GHz, 1:4 CML Fanout Buffer/Translator with Internal I/O Termination http://www.micrel.com/product-info/products/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 HBW Solutions http://www.micrel.com/product-info/as/solutions.shtml M-0317 M9999-102811 [email protected] or (408) 955-1690 9 Precision Edge® SY58020U Micrel, Inc. 16 LEAD QFN (QFN-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 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. M9999-102811 [email protected] or (408) 955-1690 10