SY56011R Low Voltage 1.2V/1.8V/2.5V CML 1:2 Fanout Buffer 6.4Gbps with Equalization Preliminary General Description The SY56011R is a fully differential, low voltage 1.2V/1.8V/2.5V CML 1:2 Fanout Buffer with input equalization. The SY56011R can process clock signals as fast as 4.5 GHz or data patterns up to 6.4Gbps. The differential input includes Micrel’s unique, 3-pin input termination architecture that interfaces to CML differential signals, without any level-shifting or termination resistor networks in the signal path. The differential input can also accept AC-coupled LVPECL and LVDS signals. Input voltages as small as 200mV (400mVpp) are applied before the 9”, 18” or 27” FR4 transmission line. For AC-coupled input interface applications, an internal voltage reference is provided to bias the VT pin. The outputs are CML, with extremely fast rise/fall times guaranteed to be less than 80ps. The SY56011R 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 SY56011R 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. Precision Edge ® Features • 1.2V/1.8V/2.5V CML 1:2 Fanout Buffer • Equalizes 9, 18, 27 inches of FR4 • Guaranteed AC performance over temperature and voltage: – DC-to > 6.4Gbps Data throughput – DC-to > 4.5GHz Clock throughput – <280ps propagation delay (IN-to-Q) – <15ps within-device skew – <80ps rise/fall times • Ultra-low jitter design – <1psRMS random jitter • High-speed CML outputs • 2.5V ±5% VCC , 1.2/1.8V/2.5V ±5% VCCO power supply operation • Industrial temperature range: –40°C to +85°C • Available in 16-pin (3mm x 3mm) QFN package Applications Functional Block Diagram • • • • Data Distribution: SONET clock and data distribution Fiber Channel clock and data distribution Gigabit Ethernet clock and data distribution Markets • • • • • • Storage ATE Test and measurement Enterprise networking equipment High-end servers Metro area network equipment Precision Edge is a registered trademark of Micrel, Inc. QFN and MicroLeadFrame are registered trademarks of Amkor Technology. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com July 2008 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish SY56011RMG QFN-16 Industrial R011 with Pb-Free bar-line indicator NiPdAu Pb-Free QFN-16 Industrial R011 with Pb-Free bar-line indicator NiPdAu Pb-Free (2) SY56011RMGTR 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 Truth Table EQ Equalization FR4 6mil Stripline LOW 9” FLOAT 18” HIGH 27” July 2008 2 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R Pin Description Pin Number Pin Name 1,2 IN, /IN Differential Input: Signals as small as 200mV VPK (400mVPP) applied to the input of 9, 18 or 27 inches 6mil FR4 stripline transmission line are then terminated with this differential input. Each input pin internally terminates with 50 Ω to the VT pin. 3 VT Input Termination Center-Tap: Each side of the differential input pair terminates to 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 ACcoupling, bypass VT with 0.1µF low ESR capacitor to VCC. See “Interface Applications” subsection and Figure 2a. 6 EQ Three level input for equalization control. High, float, low. 7 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the VCC pins as possible. Supplies input and core circuitry. 8,13 VCCO Output Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the VCCO pins as possible. Supplies the output buffers. 14 GND, Exposed pad Ground: Exposed pad must be connected to a ground plane that is the same potential as the ground pins. 12,11 Q0, /Q0 10,9 Q1, /Q1 CML Differential Output Pairs: Differential buffered copy of the input signal. The output swing is typically 390mV. See “Interface Applications” subsection for termination information. 4,5,15,16 NC July 2008 Pin Function No connect pins 3 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R 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 ............................................................... <0.5V Input Voltage (VIN) ....................................... –0.5V to VCC CML Output Voltage (VOUT) ......................... 0.6V to 3.0V 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 VCCO VCCO VCCO 2.375 1.14 1.7 2.375 2.5 1.2 1.8 2.5 2.625 1.26 1.9 2.625 V V V V ICC Power Supply Current Max. VCC 54 75 mA ICCO Power Supply Current No Load. VCCO 32 42 mA RIN Input Resistance (IN-to-VT, /IN-to-VT ) 45 50 55 Ω RDIFF_IN Differential Input Resistance (IN-to-/IN) 90 100 110 Ω VIH Input HIGH Voltage (IN, /IN) IN, /IN 1.42 VCC V VIL Input LOW Voltage (IN, /IN) IN, /IN 1.22V = 1.7-0.475 1.22 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 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. VIH(max) is specified when VT is floating. July 2008 4 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R 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 Min Typ Max Units VOH Output HIGH Voltage RL = 50Ω to VCCO VCC-0.020 VCC-0.010 VCC V VOUT Output Voltage Swing See Figure 3a 300 VDIFF_OUT Differential Output Voltage Swing See Figure 3b 600 390 475 mV 780 950 mV ROUT Output Source Impedance 45 50 55 Ω Min Typ Max Units 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 Condition VIH Input HIGH Voltage VCC-0.3 VIL Input LOW Voltage 0 IIH Input HIGH Current VIH = VCC IIL Input LOW Current VIL = GND V VEE+0.3 V 400 uA -480 uA Note: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. July 2008 5 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R 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 tPD Propagation Delay tSkew Within Device Skew Note 8 Part-to-Part Skew tJitter tr tf VOUT > 200mV IN-to-Q Clock Note 7, Figure 1 Typ Max Gbps 4.5 100 Units GHz 180 280 ps 3 15 ps Note 9 100 ps Random Jitter Note 10 1 psRMS Output Rise/Fall Time (20% to 80%) At full output swing. 80 ps 20 50 Notes: 7. Propagation delay is measured with no attenuating transmission line connected to the input. 8. Within-device skew is measured across all 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 measured with a K28.7 pattern, measured at ≤ fMAX. July 2008 6 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R Interface Applications For Input Interface Applications see Figures 4a-e and for CML Output Termination, see Figures 5a-d. 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 needs to be terminated, do not leave floating. CML Output Termination with VCCO 1.8V For VCCO of 1.8V, Figure 5a and Figure 5b, terminate either with 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. Input Termination 1.8V CML driver: Terminate input with VT tied to 1.8V. Don’t terminate 100 ohms differentially. 2.5V CML driver: Terminate input with either VT tied to 2.5V or 100 ohms differentially. The input cannot be DC-coupled from a 1.2V CML driver. Timing Diagrams Figure 1. Propagation Delay July 2008 7 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R Typical Characteristics VCC = 2.5, VCCO = 1.2V, GND = 0V, VIN = 400mV, RL = 50Ω to 1.2V, Data Pattern: 2 -1, TA = 25°C, unless otherwise stated. 23 July 2008 8 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R 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 July 2008 Figure 3b. Differential Swing 9 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R Input Interface Applications Figure 4a. CML Interface Figure 4b. CML Interface 100Ω Differential (DC-Coupled, 2.5V) 50Ω to VCC (DC-Coupled, 1.8V, 2.5V) Figure 4d. LVPECL Interface (AC-Coupled) Figure 4e. LVDS Interface (AC-Coupled) July 2008 10 Figure 4c. CML Interface (AC-Coupled) M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R CML Output Termination Figure 5a. 1.2V or 1.8V CML DC-Coupled Termination Figure 5b. 1.8V CML DC-Coupled Termination Figure 5c. CML AC-Coupled Termination VCCO 1.8V Only Figure 5d. CML AC-Coupled Termination VCCO 1.2V Only Related Product and Support Documents Part Number Function Datasheet Link HBW Solutions New Products and Termination Application Notes http://www.micrel.com/page.do?page=/productinfo/as/HBWsolutions.shtml July 2008 11 M9999-070208-A [email protected] or (408) 955-1690 Micrel, Inc. SY56011R 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. © 2008 Micrel, Incorporated. July 2008 12 M9999-070208-A [email protected] or (408) 955-1690