SY56020XR Low Voltage 1.2V/1.8V/2.5V CML 1:4 Fanout Buffer 6.4Gbps with Equalization General Description The SY56020XR is a fully differential, low voltage 1.2V/1.8V/2.5V CML 1:4 Fanout Buffer with input equalization. The SY56020XR can process clock signals as fast as 4.5GHz or data patterns up to 6.4Gbps. The differential input includes Micrel’s unique 3-pin input termination architecture that interfaces to DC-coupled 2.5V/3.3V LVPECL, 1.2V/1.8V/2.5V CML or LVDS differential signals. For AC-coupled input applications, an internal voltage reference is provided for input bias. Input voltages as small as 200mV (400mVpp) are applied before the 9, 18 or 27-inch FR4 transmission line. The outputs are CML. The SY56020XR operates from a 2.5V ±5% core supply and a 1.2V, 1.8V or 2.5V ±5% output supply and is guaranteed over the full industrial temperature range (–40°C to +85°C). The SY56020XR is part of Micrel’s ® high-speed, Precision Edge product line. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Functional Block Diagram Precision Edge Features • 1.2V/1.8V/2.5V CML 1:4 Fanout Bufer with EQ. • Guaranteed AC performance over temperature and voltage: – DC-to > 6.4Gbps throughput – <300ps propagation delay (IN-to-Q) – <15ps within-device skew • Ultra-low jitter design – <0.8psRMS random jitter – <10psPP deterministic jitter • High-speed CML outputs • 2.5V ±5% , 1.8/1.2V ±5% power supply operation • Industrial temperature range: –40°C to +85°C • Available in 16-pin (3mm x 3mm) QFN package Applications • • • • Data Distribution SONET clock and data distribution Fibre Channel clock and data distribution Gigabit Ethernet clock and data distribution Precision Edge is a registered trademark of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com February 2010 M9999-020210-A [email protected] or (408) 955-1690 ® Micrel, Inc. SY56020XR Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish SY56020XRMG QFN-16 Industrial 20XR with Pb-Free bar-line indicator NiPdAu Pb-Free QFN-16 Industrial 20XR with Pb-Free bar-line indicator NiPdAu Pb-Free (2) SY56020XRMGTR Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only. 2. Tape and Reel. Pin Configuration 16-Pin QFN February 2010 2 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR Pin Description Pin Number Pin Name Pin Function 1,4 IN, /IN 2 VT Input Termination Center-Tap: Each side of the differential input pair terminates to the VT pin. This pin provides a center-tap to a termination network for maximum interface flexibility. An internal high impedance resistor divider biases VT to allow input AC coupling. For AC coupling, bypass VT with 0.1µF low ESR capacitor to VCC. See “Input Interface Applications” subsection and Figure 2a. Three level input for equalization control. Differential Input: Accepts differential signals as small as 200mV (400mVPP) applied to the input of a 9, 18 or 27 inch 6mil FR4 stripline transmission line. See “Input and Output Stage” section for details of this input. 3 EQ 13 VCC Positive Power Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to the VCC pin as possible. Supplies the input and core circuitry. 8 VCCO Output Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to the VCCO pin as possible. Supplies the output buffers. 5,16 GND, Ground: Exposed pad must be connected to a ground plane that is the same potential as the ground pins. Exposed pad 15,14 Q0, /Q0 12,11 Q1, /Q1 10,9 Q2, /Q2 7,6 Q3, /Q3 CML Differential Output Pair: Differential buffered copy of the input signal. The output swing is typically 390mV. See “Functional Description” subsection for termination information. Truth Table EQ Input February 2010 Equalization FR4 6mil Stripline LOW 9“ FLOAT 18” HIGH 27” 3 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC) ............................... –0.5V to +3.0V Supply Voltage (VCCO) ............................. –0.5V to +3.0V VCC -VCCO ................................................................ <1.8V VCCO -VCC ............................................................... <0.5 V Input Voltage (VIN) ............................. –0.5V to VCC+0.4V CML Output Voltage (VOUT) ............................ 0.6V to 3V Current (VT) Source or sink on VT pin ............................. ±100mA Input Current Source or sink Current on (IN, /IN) ................ ±50mA Maximum operating Junction Temperature .......... 125°C Lead Temperature (soldering, 20sec.) .................. 260°C Storage Temperature (Ts) .................... –65°C to +150°C Supply Voltage (VCC) .......................... 2.375V to 2.625V (VCCO)………………..1.14V to 2.625V Ambient Temperature (TA) ................... –40°C to +85°C (3) Package Thermal Resistance QFN Still-air (θJA) ............................................ 75°C/W Junction-to-board (ψJB) ......................... 33°C/W DC Electrical Characteristics(4) TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min Typ Max Units VCC Power Supply Voltage Range VCC 2.375 2.5 2.625 V VCCO 1.14 1.2 1.26 V VCCO 1.7 1.8 1.9 V VCCO 2.375 2.5 2.625 V ICC Power Supply Current Max. VCC 70 90 mA ICCO Power Supply Current No Load. VCCO 64 84 mA RDIFF_IN Differential Input Resistance (IN-to-/IN) 100 110 Ω VIH Input HIGH Voltage (IN, /IN) IN, /IN 1.2 VCC+0.4 V VIL Input LOW Voltage (IN, /IN) IN, /IN 0 VIH–0.2 V VIN Input Voltage Swing (IN, /IN) See Figure 3a, Note 5, applied to input of transmission line. 0.2 1.0 V VDIFF_IN Differential Input Voltage Swing (|IN - /IN|) See Figure 3b, Note 5, applied to input of transmission line. 0.4 2.0 V VT_IN Voltage from Input to VT 1.28 V 90 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. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB. ψJB and θJA values are determined for a 4-layer board in still-air number, unless otherwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 5. VIN (max) is specified when VT is floating. February 2010 4 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR CML Outputs DC Electrical Characteristics(6) VCCO = 1.14V to 1.26V RL = 50Ω to VCCO. VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50Ω to VCCO or 100Ω across the outputs. VCC = 2.375V to 2.625V; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition VOH Output HIGH Voltage RL = 50Ω to VCCO VOUT Output Voltage Swing See Figure 3a VDIFF_OUT Differential Output Voltage Swing See Figure 3b ROUT Output Source Impedance Min Typ Max Units VCC-0.020 VCC-0.010 VCC V 300 390 475 mV 600 780 950 mV 45 50 55 Ω Min Typ Max Units VCC-0.3 VCC V 0 VEE+0.3 V 400 µA Three Level EQ Input DC Electrical Characteristics(6) VCC = 2.375V to 2.625V; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter VIH Input HIGH Voltage Condition VIL Input LOW Voltage IIH Input HIGH Current VIH = VCC IIL Input LOW Current VIL = GND -480 µA AC Electrical Characteristics VCCO = 1.14V to 1.26V RL = 50Ω to VCCO. VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50Ω to VCCO or 100Ω across the outputs. VCC = 2.375V to 2.625V; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min fMAX Maximum Frequency NRZ Data 6.4 Gbps VOUT > 200mV (Clock) 4.5 GHz 120 tPD Propagation Delay (IN-to-Q) Note 7, Figure 1 tSkew Output-to-Output Skew Note 8 Part-to-Part Skew tJitter tR tF Typ Max Units 200 300 ps 3 15 ps Note 9 100 ps Data Random Jitter Note 10 0.8 psRMS Data Deterministic Jitter Note 11 10 psPP Output Rise/Fall Time (20% to 80%) At full output swing. 100 ps Duty Cycle Differential I/O 55 % 30 45 60 Notes: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 7. Propagation delay is measured with no attenuating transmission line connected to the input. 8. Output-to-Output skew is the difference in time between both outputs under identical input transition, temperature and power supply 9. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the respective inputs. 10. Random jitter is additive jitter. 11. Deterministic jitter is measured with 223–1 PRBS pattern. February 2010 5 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR Timing Diagrams Figure 1. Propagation Delay Input and Output Stage Figure 2b. Simplified CML Output Buffer Figure 2a. Simplified Differential Input Buffer Single-Ended and Differential Swings Figure 3a. Single-Ended Swing February 2010 Figure 3b. Differential Swing 6 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR Input Interface Applications Figure 4a. CML Interface 100 Ω Differential (DC-Coupled, 1.8V, 2.5V) Figure 4b. CML Interface 50 Ω to Vcc (DC-Coupled, 1.2V,1.8V,2.5V) Figure 4c. CML Interface (AC-Coupled) *See note in Functional Description for 1.2V CML driver with AC-Coupling. Figure 4d. LVPECL Interface (AC-Coupled) Figure 4e. LVPECL Interface (DC-Coupled 2.5V and 3.3V) Figure 4f. LVDS Interface February 2010 7 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR CML Output Termination Figure 5b. 1.8V, 2.5V CML DC-Coupled Termination Figure 5a. 1.2V, 1.8V, 2.5V CML DC-Coupled Termination Figure 5c. CML AC-Coupled Termination. Figure 5d. CML AC-Coupled Termination. VCCO 1.8V, 2.5V only. February 2010 VCCO 1.2V only. 8 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR Functional Description CML Output Termination with Vcco 1.2V For VCCO of 1.2V, Figure 5a, terminate the output with 50 Ohms to 1.2V, not 100 ohms differentially across the outputs. If AC coupling is used, Figure 5d, terminate into 50 ohms to 1.2V before the coupling capacitor and then connect to a high value resistor to a reference voltage. Any unused output pair with VCCO at 1.2V needs to be terminated, do not leave floating. February 2010 CML Output Termination with VCCO 1.8V, 2.5V For VCCO of 1.8V or 2.5V, Figure 5a/b, terminate with either 50 ohms to 1.8V or 100 ohms differentially across the outputs. AC-or DC-coupling is fine. For best signal integrity, terminate any unused output pairs. 9 M9999-020210-A [email protected] or (408) 955-1690 Micrel, Inc. SY56020XR Package Information 16-Pin QFN 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. February 2010 10 M9999-020210-A [email protected] or (408) 955-1690