Micrel, Inc. Precision Edge® SY58036U ® 6GHz, 1:6 400mV LVPECL FANOUT BUFFER WITH 2:1 MUX INPUT AND INTERNAL TERMINATION Precision Edge SY58036U FEATURES ■ Provides six ultra-low skew copies of the selected input ■ 2:1 MUX input included for clock switchover applications ■ Guaranteed AC performance over temperature and voltage: • Clock frequency range: DC to > 6GHz • <300ps IN-to-OUT tpd • <80ps tr / tf times • <20ps skew (output-to-output) ■ Ultra-low jitter design: • <1psRMS random jitter • <10psPP total jitter (clock) • <1psRMS cycle-to-cycle jitter • <0.7psRMS crosstalk-induced jitter ■ Low supply voltage operation: 2.5V and 3.3V ■ Unique input termination and VT pin accepts DCcoupled and AC-coupled inputs (CML, PECL, LVDS) ■ Unique input isolation design minimizes crosstalk ■ 400mV LVPECL (100K compatible) output swing ■ –40°C to +85°C temperature range ■ Available in 32-pin (5mm × 5mm) MLF® package Precision Edge® DESCRIPTION The SY58036U is a 2.5V/3.3V precision, high-speed, 1:6 fanout buffer capable of handling clocks up to 6GHz. A differential 2:1 MUX input is included for redundant clock switchover applications. The differential input includes Micrel’s unique, 3-pin input termination architecture that allows the device to interface to any differential signal (AC- or DC-coupled) as small as 100mV without any level shifting or termination resistor networks in the signal path. The outputs are 400mV LVPECL (100K temperature compensated), with extremely fast rise/ fall times guaranteed to be less than 80ps. The SY58036U operates from a 2.5V ±5% supply or a 3.3V ±10% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. For applications that require CML outputs, consider the SY58034U or for 800mV LVPECL outputs the SY58035U. The SY58036U is part of Micrel’s high-speed, Precision Edge® product line. All support documentation can be found on Micrel’s web site at www.micrel.com. FUNCTIONAL BLOCK DIAGRAM APPLICATIONS ■ ■ ■ ■ Redundant clock distribution All SONET/SDH clock distribution All Fibre Channel distribution All Gigabit Ethernet clock distribution 1:6 Fanout Q0 /Q0 2:1 Mux IN0 Q1 50Ω VT0 50Ω /Q1 0 Q2 /IN0 VREF-AC0 Mux /Q2 S Q3 IN1 50Ω VT1 50Ω 1 /Q3 /IN1 Q4 VREF-AC1 /Q4 SEL (TTL/CMOS) Q5 /Q5 Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-020707 [email protected] or (408) 955-1690 1 Rev.: D Amendment: /0 Issue Date: February 2007 Precision Edge® SY58036U Micrel, Inc. PACKAGE/ORDERING INFORMATION GND SEL VCC Q0 /Q0 Q1 /Q1 VCC Ordering Information(1) 32 31 30 29 28 27 26 25 IN0 VT0 VREF-AC0 /IN0 IN1 VT1 VREF-AC1 /IN1 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 GND VCC Q2 /Q2 Q3 /Q3 VCC GND 17 Part Number Package Type Operating Range Package Marking Lead Finish SY58036UMI MLF-32 Industrial SY58036U Sn-Pb SY58036UMITR(2) MLF-32 Industrial SY58036U Sn-Pb SY58036UMG(3) MLF-32 Industrial SY58036U with Pb-Free bar-line indicator NiPdAu Pb-Free SY58036UMGTR(2, 3) MLF-32 Industrial SY58036U with Pb-Free bar-line indicator NiPdAu Pb-Free 9 10 11 12 13 14 15 16 GND NC VCC /Q5 Q5 /Q4 Q4 VCC Notes: 32-Pin MLF® 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. 3. Pb-Free package recommended for new designs. (MLF-32) PIN DESCRIPTION Pin Number Pin Name 1, 4 5, 8 IN0, /IN0 IN1, /IN1 Pin Function Differential Input: These input pairs are the differential signal inputs to the device. These inputs accept AC- or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates to a VT pin through 50Ω. Note that these inputs will default to an indeterminate state if left open. Please refer to the “Input Interface Applications” section for more details. 2, 6 VT0, VT1 Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT0 and VT1 pins provide a center-tap to a termination network for maximum interface flexibility. See “Input Interface Applications” section for more details. 31 SEL This single-ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note that this input is internally connected to a 25kΩ pull-up resistor and will default to a logic HIGH state if left open. The MUX select switchover function is asynchronous. 10 NC No connect. 11, 16, 18, 23, 25, 30 VCC 29, 28 27, 26 22, 21 20, 19 15, 14 13, 12 Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5 9, 17, 24, 32 GND, Exposed Pad 3, 7 VREF-AC0 VREF-AC1 Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors and place as close to the VCC pins as possible. Differential Outputs: These 100K (temperature compensated) LVPECL output pairs are low skew copies of the selected input. Please refer to the “Truth Table” for details. Ground. Ground pin and exposed pad must be connected to the same ground plane. Reference Voltage: These output biases to VCC–1.2V. It is used for AC-coupling inputs (IN, /IN). Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR capacitor to VCC. See “Input Interface Applications” section. Maximum sink/source current is ±1.5mA. Due to the limited drive capability, the VREF-AC pin is only intended to drive its respective VT pin. TRUTH TABLE SEL 0 IN0 Input Selected 1 IN1 Input Selected M9999-020707 [email protected] or (408) 955-1690 2 Precision Edge® SY58036U 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 LVPECL Output Current (IOUT) Continuous ............................................................. 50mA Surge .................................................................... 100mA Termination Current Source or sink current on VT pin ........................ ±100mA Input Current Source or sink current on IN, /IN pin .................... ±50mA Source or sink current on VREF-AC pin ................ ±2mA Lead Temperature (soldering, 10 sec.) ..................... 220°C Storage Temperature Range (TS ) ........... –65°C to +150°C Power Supply Voltage (VCC) ............... +2.375V to +2.625V ............................................................ +3.0V to +3.6V Ambient Temperature Range (TA) ............. –40°C to +85°C Package Thermal Resistance(3) MLF® (θJA) Still-Air ............................................................. 35°C/W MLF® (ψJB) Junction-to-Board ............................................ 16°C/W DC ELECTRICAL CHARACTERISTICS(4) TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter VCC Power Supply Voltage Condition Min Typ Max Units 2.375 2.5 2.625 V 3.0 3.3 3.6 V 180 250 mA ICC Power Supply Current No load, max. VCC RDIFF_IN Differential Input Resistance (IN-to-/IN) 90 100 110 Ω RIN Input Resistance (IN-to-VT) 45 50 55 Ω VIH Input HIGH Voltage (IN, /IN) VCC–1.2 VCC V VIL Input LOW Voltage (IN, /IN) 0 VIH–0.1 V VIN Input Voltage Swing (IN, /IN) See Figure 1a. 0.1 1.7 V VDIFF_IN Differential Input Voltage Swing |IN, /IN| See Figure 1b. 0.2 VT IN IN to VT (IN, /IN) VREF-AC Reference Voltage V 1.28 VCC–1.3 VCC–1.2 VCC–1.1 V 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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. ΨJB and θJA are shown for a 4-layer PCB in a still air environment, unless otherwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. M9999-020707 [email protected] or (408) 955-1690 3 Precision Edge® SY58036U Micrel, Inc. LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS(6) VCC = 2.5V ±5% or 3.3V ±10%, RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min Typ Max Units VOH Output HIGH Voltage VCC–1.145 VCC–0.895 V VOL Output LOW Voltage VCC–1.545 VCC–1.295 V VOUT Output Differential Swing See Figure 1a. 150 400 mV VDIFF_OUT Differential Output Voltage Swing See Figure 1b. 300 800 mV Min Typ LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(6) VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition VIH Input HIGH Voltage VIL Input LOW Voltage IIH Input HIGH Current –125 IIL Input LOW Current –300 2.0 Note: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. M9999-020707 [email protected] or (408) 955-1690 Max 4 Units V 0.8 V 40 µA µA Precision Edge® SY58036U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%, RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition fMAX Maximum Operating Frequency VOUT ≥ 200mV tpd ∆tpd Tempco Min Typ 6 7 Differential Propagation Delay (IN0 or IN1-to-Q) 150 220 300 ps (SEL-to-Q) 100 220 400 ps Differential Propagation Delay Temperature Coefficient tSKEW tJITTER tr, tf Clock Max Units GHz 65 fs/°C Output-to-Output Note 8 20 ps Part-to-Part Note 9 100 ps Cycle-to-Cycle Jitter Note 10 1 psRMS Random Jitter (RJ) Note 11 1 psRMS Total Jitter (TJ) Note 12 10 psPP Adjacent Channel Crosstalk-Induced Jitter Note 13 0.7 psRMS 80 ps Output Rise/Fall Time Full Swing, 20% to 80% 20 40 Notes: 7. High frequency AC electricals are guaranteed by design and characterization. 8. Output-to-output skew is measured between outputs under identical transitions. 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. 10. Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, Tn–Tn–1 where T is the time between rising edges of the output signal. 11. Random jitter is measured with a K28.7, measured at 2.5Gbps. 12. Total jitter definition: with an ideal clock input of frequency ≤ fMAX, no more than one output edge in 1012 output edges will deviate by more than the specified peak-to-peak jitter value. 13. Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs. SINGLE-ENDED AND DIFFERENTIAL SWINGS VDIFF_IN, VDIFF_OUT 800mV (Typ.) VIN, VOUT 400mV (Typ.) Figure 1a. Single-Ended Voltage Swing M9999-020707 [email protected] or (408) 955-1690 Figure 1b. Differential Voltage Swing 5 Precision Edge® SY58036U Micrel, Inc. TIMING DIAGRAMS IN /IN tpd Q /Q Input-to-Q tpd SEL VCC/2 VCC/2 tpd tpd Q /Q SEL-to-Q tpd M9999-020707 [email protected] or (408) 955-1690 6 Precision Edge® SY58036U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, RL = 50Ω to VCC–2V; TA = 25°C, unless otherwise stated. Output Swing vs. Frequency Propagation Delay vs. Temperature 226 PROPAGATION DELAY (ps) 450 OUTPUT SWING (mV) 400 350 300 250 200 150 100 50 0 0 2000 4000 6000 8000 10000 FREQUENCY (MHz) M9999-020707 [email protected] or (408) 955-1690 224 222 220 218 -40 -20 0 20 40 60 TEMPERATURE (C) 7 80 100 Precision Edge® SY58036U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 3.3V, GND = 0, VIN = 100mV, RL = 50Ω to VCC–2V; TA = 25°C, unless otherwise stated. Output Swing (100mV/div.) 2.5GHz Output Output Swing (100mV/div.) 200MHz Output TIME (50ps/div.) 5GHz Output 7GHz Output Output Swing (100mV/div.) Output Swing (100mV/div.) TIME (600ps/div.) TIME (20ps/div.) TIME (25ps/div.) M9999-020707 [email protected] or (408) 955-1690 8 Precision Edge® SY58036U Micrel, Inc. INPUT AND OUTPUT STAGES VCC VCC IN 50Ω VT GND 50Ω /Q /IN Q Figure 2a. Simplified Differential Input Stage Figure 2b. Simplified LVPECL Output Stage INPUT INTERFACE APPLICATIONS VCC VCC VCC IN LVPECL IN /IN SY58036U GND NC VT 0.01µF Rpd Rpd GND GND Figure 3a. LVPECL Interface (DC-Coupled) /IN SY58036U VCC Rpd For 3.3V, Rpd = 50Ω. For 2.5V, Rpd = 19Ω. CML /IN VREF-AC VCC IN LVPECL VREF-AC 0.01µF VT For 3.3V, Rpd = 100Ω. For 2.5V, Rpd = 50Ω. Figure 3b. LVPECL Interface (AC-Coupled) VCC IN CML IN LVDS /IN SY58036U GND SY58036U VCC VREF-AC 0.01µF VT Figure 3d. CML Interface (AC-Coupled) M9999-020707 [email protected] or (408) 955-1690 GND NC VREF-AC NC VT Option: May connect VT to VCC. VCC /IN SY58036U GND NC VREF-AC NC VT Figure 3e. LVDS Interface 9 Figure 3c. CML Interface (DC-Coupled) Precision Edge® SY58036U Micrel, Inc. OUTPUT INTERFACE APPLICATIONS for terminating the LVECL output: parallel-thevenin equivalent termination and parallel termination (3-resistor). Unused output pairs may be left floating. However, singleended outputs must be terminated, or balanced. LVPECL has high input impedance, very low output (open emitter) impedance, and small signal swing, which results in low EMI. LVPECL is ideal driving 50Ω and 100Ω controlled impedance transmission lines. There are several techniques +3.3V +3.3V ZO = 50Ω R1 130Ω +3.3V R1 130Ω +3.3V +3.3V Z = 50Ω Z = 50Ω ZO = 50Ω 50Ω R2 82Ω “source” R2 82Ω “destination” Note: For 2.5V systems: R b = 19Ω Note: For 2.5V systems: R1 = 250Ω, R2 = 62.5Ω 50Ω 50Ω VCC Rb C1 0.01µF (optional) Figure 4b. Parallel Termination (3-Resistor) Figure 4a. Parallel Thevenin-Equivalent Termination RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION Part Number Function Data Sheet Link SY58034U 6GHz, 1:6 CML Fanout Buffer with 2:1 MUX Input and Internal I/O Termination http://www.micrel.com/product-info/products/sy58034u.shtml SY58035U 4.5GHz, 1:6 LVPECL Fanout Buffer with 2:1 MUX Input and Internal Termination http://www.micrel.com/product-info/products/sy58035u.shtml HBW Solutions MLF® Application Note www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf New Products and Applications www.micrel.com/product-info/products/solutions.shtml M9999-020707 [email protected] or (408) 955-1690 10 Precision Edge® SY58036U Micrel, Inc. 32-PIN MicroLeadFrame® (MLF-32) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane PCB Thermal Consideration for 32-Pin MLF® 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. TEL 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 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. M9999-020707 [email protected] or (408) 955-1690 11