Micrel, Inc. 6GHz, 1:6 400mV LVPECL Fanout Buffer WITH 2:1 MUX Input AND INTERNAL TERMINATION Precision Edge® SY58036U ® 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: • 50fsRMS phase jitter (typ) ■ 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 x 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. M9999-073010 [email protected] or (408) 955-1690 1 Rev.: F Amendment: /0 Issue Date: July 2010 Precision Edge® SY58036U Micrel, Inc. PACKAGE/ORDERING INFORMATION GND SEL VCC Q0 /Q0 Q1 /Q1 VCC Ordering Information(1) 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 9 10 11 12 13 14 15 16 GND VCC Q2 /Q2 Q3 /Q3 VCC GND 17 Package Operating Type Range Part Number SY58036UMI MLF-32 Industrial SY58036UMITR(2) MLF-32 Industrial Package Marking Lead Finish SY58036U Sn-Pb SY58036U Sn-Pb SY58036UMG(3) MLF-32 Industrial SY58036U with NiPdAu Pb-Free bar-line indicator Pb-Free SY58036UMGTR(2, 3) MLF-32 Industrial SY58036U with NiPdAu Pb-Free bar-line indicator Pb-Free Notes: GND NC VCC /Q5 Q5 /Q4 Q4 VCC IN0 VT0 VREF-AC0 /IN0 IN1 VT1 VREF-AC1 /IN1 32 31 30 29 28 27 26 25 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. 32-Pin MLF® (MLF-32) PIN DESCRIPTION Pin Number Pin Name Pin Function 1, 4 IN0, /IN0 5, 8 IN1, /IN1 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 50ý. Note that these inputs will default to an indeterminate state if left open. Please refer to the “Input Interface Applications” section for more details. 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. 2, 6 VT0, VT1 31 SEL 10 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. NC No connect. 11, 16, 18, VCC 23, 25, 30 29, 28 27, 26 22, 21 20, 19 15, 14 13, 12 Positive Power Supply: Bypass with 0.1µF || 0.01µF low ESR capacitors and place as close to the VCC pins as possible. Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5 9, 17, 24, 32 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. GND, Exposed Pad 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. 3, 7 VREF-AC0 VREF-AC1 TRUTH TABLE SEL 0 IN0 Input Selected 1 IN1 Input Selected M9999-073010 [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 Condition VCC Power Supply Voltage ICC Power Supply Current RDIFF_IN Differential Input Resistance (IN-to-/IN) RIN Input Resistance (IN-to-VT) Min Typ Max Units 2.375 2.5 2.625 V 3.0 3.3 3.6 V No load, max. VCC 180 250 mA 90 100 110 Ω 45 50 55 Ω VCC V VIH Input HIGH Voltage (IN, /IN) Note 5 Input LOW Voltage (IN, /IN) VIN Input Voltage Swing (IN, /IN) See Figure 1a. 0.1 Differential Input Voltage Swing |IN, /IN| See Figure 1b. 0.2 VIL VDIFF_IN VT IN VREF-AC VCC–1.6 0 IN to VT (IN, /IN) Reference Voltage VIH–0.1 1.7 1.28 VCC–1.3 VCC–1.2VCC–1.1 V V V 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. 5. VIH (min) not lower than 1.2V. M9999-073010 [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 VOH VOL VOUT VDIFF_OUT Parameter Condition Min Output HIGH Voltage Typ VCC–1.145 Output LOW Voltage Output Differential Swing See Figure 1a. Differential Output Voltage Swing See Figure 1b. VCC–1.545 Max Units VCC–0.895 V VCC–1.295 V 150 400 mV 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 VIH Input HIGH Voltage Input LOW Voltage 0.8 V IIH Input HIGH Current –125 40 µA Input LOW Current –300 VIL IIL Condition Note: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. M9999-073010 [email protected] or (408) 955-1690 Max 2.0 4 Units V 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 Min Typ Max Units VOUT ≥ 200mV 6 7 GHz 150 220 300 ps 100 220 400 fMAX Maximum Operating Frequency tpd Differential Propagation Delay (IN0 or IN1-to-Q) ∆tpd Tempco (SEL-to-Q) Differential Propagation Delay Temperature Coefficient 65 ps fs/°C tSKEW Output-to-Output Note 8 20 ps Part-to-Part Note 9 100 ps RMS Phase Jitter tJITTER tr, tf Output: 622MHz Integrated Range: 12kHz - 20MHz 50 Adjacent Channel Note 10 Crosstalk-Induced Jitter Output Rise/Fall Time Full Swing, 20% to 80% 20 40 fs 0.7 psRMS 80 ps 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.Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs. Phase Noise 0 -10 RMS Phase Jitter (Random) 12kHz to 20MHz: 50fs (Typical) -20 -30 NOISEPOWER(dBc/Hz) -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 -200 10 100 1K 10K 100K OFFSETFREQUENCY(Hz) Phase Noise Plot: 622MHz @ 3.3V M9999-073010 [email protected] or (408) 955-1690 5 1M 10M 100M Precision Edge® SY58036U Micrel, Inc. Single-Ended and Differential SwingS VDIFF_IN, VDIFF_OUT 800mV (Typ.) VIN, VOUT 400mV (Typ.) Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing TIMING DIAGRAMS IN /IN tpd Q /Q Input-to-Q tpd SEL VCC/2 VCC/2 tpd tpd Q /Q SEL-to-Q tpd M9999-073010 [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. PROPAGATION DELAY (ps) OUTPUT SWING (mV) 450 Output Swing vs.Frequency 400 350 300 250 200 150 100 50 0 0 2000 4000 6000 8000 10000 FREQUENCY (MHz) M9999-073010 [email protected] or (408) 955-1690 226 PropagationDelay vs. Temperature 224 222 220 218 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 7 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.) 2.5GHzOutput Output Swing (100mV/div.) 200MHzOutput TIME (50ps/div.) 5GHzOutput 7GHzOutput Output Swing (100mV/div.) Output Swing (100mV/div.) TIME (600ps/div.) TIME (20ps/div.) TIME (25ps/div.) M9999-073010 [email protected] or (408) 955-1690 8 Precision Edge® SY58036U Micrel, Inc. Input AND OUTPUT STAGES VCC VCC IN 50Ω VT 50Ω GND /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 0.01µF VT Rpd Rpd GND Figure 3a. LVPECL Interface (DC-Coupled) /IN SY58036U Rpd VCC GND 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) IN IN LVDS CML /IN /IN SY58036U SY58036U GND VCC VREF-AC 0.01µF VT Figure 3d. CML Interface (AC-Coupled) M9999-073010 [email protected] or (408) 955-1690 GND NC VREF-AC NC VT Option: May connect VT to VCC. VCC VCC 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 termination and parallel termination (3-resistor). Unused output pairs may be left floating. However, single-ended 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 for terminating the LVECL output: parallel-thevenin equivalent +3.3V +3.3V ZO =50Ω R1 130Ω +3.3V R1 130Ω +3.3V +3.3V Z =50Ω Z =50Ω ZO =50Ω R2 82Ω 50Ω “source” R2 82Ω Note: For 2.5V systems: Rb=19Ω Note: For 2.5V systems: R1=250Ω,R2=62.5Ω 50Ω 50Ω “destination” 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 MLF® Application Note www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf HBW Solutions New Products and Applications www.micrel.com/product-info/products/solutions.shtml M9999-073010 [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 Heavy Copper Plane Heavy Copper Plane VEE VEE 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. 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. M9999-073010 [email protected] or (408) 955-1690 11