Micrel, Inc. Precision Edge® SY58034U ® 6GHz, 1:6 CML FANOUT BUFFER WITH 2:1 MUX INPUT AND INTERNAL I/O TERMINATION Precision Edge SY58034U 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 • <290ps IN-to-OUT tpd • <60ps tr / tf times • <20ps skew (output-to-output) Unique input isolation design minimizes crosstalk Ultra low-jitter design: • 60fs RMS phase 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) Internal 50Ω output source termination Precision Edge® DESCRIPTION The SY58034U 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 50ý source terminated CML, with extremely fast rise/fall times guaranteed to be less than 60ps. The SY58034U 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 LVPECL outputs, consider the SY58035U or SY58036U Multiplexers. The SY58034U 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. 400mV CML output swing –40°C to +85°C temperature range Available in 32-pin (5mm x 5mm) QFN package 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. M9999-082707 [email protected] or (408) 955-1690 1 Rev.: E Amendment: /0 Issue Date: August 2007 Precision Edge® SY58034U 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 17 Package Marking Lead Finish SY58034UMG QFN-32 Industrial SY58034U with NiPdAu Pb-free bar-line indicator Pb-Free SY58034UMGTR(2) QFN-32 Industrial SY58034U with NiPdAu Pb-free bar-line indicator Pb-Free Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. GND NC VCC /Q5 Q5 /Q4 Q4 VCC 9 10 11 12 13 14 15 16 GND VCC Q2 /Q2 Q3 /Q3 VCC GND Package Operating Type Range Part Number 32-Pin QFN PIN DESCRIPTION Pin Number Pin Name Pin Function 1, 4 5, 8 IN0, /IN0 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. 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 25ký 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 0.1µF™™ 0.01µF low ESR capacitors and place as close to the VCC pins as possible. Differential Outputs: These CML output pairs are low skew output copies of the selected input. The output stage is optimized to deliver a 400mV swing (single-ended) into 50ý. Each output includes a 50ý source-termination resistor, thus minimizing any return reflections. Unused output pins may be left floating. 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 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 M9999-082707 [email protected] or (408) 955-1690 2 Precision Edge® SY58034U 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 CML Output Voltage (VOUT) ........... VCC–1.0V to VCC+0.5V 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, 20 sec.) ..................... 260°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) QFN (θJA) Still-Air ............................................................. 35°C/W QFN (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 245 320 mA ICC Power Supply Current No load, max. VCC RDIFF_IN Differential Input Resistance |IN–/IN| 90 100 110 ý RIN Input Resistance (IN-to-VT) 45 50 55 ý VIH Input HIGH Voltage (IN, /IN) VCC–1.6 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 Note 5 V 1.28 VCC–1.3 VCC–1.2 VCC–1.1 V V Notes: 1. Permanent device damage may occur if the measurements in the “Absolute Maximum Ratings” section 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 determined for a 4-layer board in a still air, 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. M9999-082707 [email protected] or (408) 955-1690 3 Precision Edge® SY58034U Micrel, Inc. CML OUTPUT DC ELECTRICAL CHARACTERISTICS(6) VCC = 2.5V ±5% or 3.3V ±10%; TA= -40°C to 85°C; RL = 100ý across each output pair or equivalent, unless otherwise stated. Symbol Parameter Condition Min Typ Max VOH Output HIGH Voltage VOUT Output Voltage Swing RL = 50ý to VCC See Figure 1a. VDIFF_OUT Differential Output Voltage Swing See Figure 1b. ROUT Output Source Impedance VCC–0.020 VCC Units V 325 400 mV 650 800 mV 40 50 60 ý Min Typ Max Units 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. M9999-082707 [email protected] or (408) 955-1690 4 V 0.8 V 40 μA μA Precision Edge® SY58034U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to 85°C, RL= 100ý across each output pair, or equivalent, unless otherwise stated. Symbol Parameter Condition fMAX Maximum Operating Frequency Clock VOUT ž 200mV tpd ∆tpd Tempco Min Typ 6 7.5 Differential Propagation Delay (IN0 or IN1-to-Q) 140 220 290 ps (SEL-to-Q) 100 200 400 ps Differential Propagation Delay Temperature Coefficient tSKEW tJITTER Units GHz 65 fs/°C Output-to-Output Note 8 20 ps Part-to-Part Note 9 100 ps RMS Phase Jitter Output = 622MHz Integration range: 12kHz - 20MHz Adjacent Channel Crosstalk-Induced Jitter tr, tf Max Output Rise/Fall Time 60 Note 10 Full swing, 20% to 80% 20 fs 0.7 psRMS 60 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. SINGLE-ENDED AND DIFFERENTIAL SWINGS VDIFF_IN, VDIFF_OUT 800mV (Typ.) VIN, VOUT 400mV (Typ.) Figure 1a. Single-Ended Voltage Swing M9999-082707 [email protected] or (408) 955-1690 Figure 1b. Differential Voltage Swing 5 Precision Edge® SY58034U 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 M9999-082707 [email protected] or (408) 955-1690 6 Precision Edge® SY58034U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, RL = 100ý across the output; TA = 25°C, unless otherwise stated. 450 400 350 300 250 200 150 100 50 0 0 224 PROPAGATION DELAY (ps) OUTPUT SWING (mV) 500 Output Swing vs. Frequency 2000 4000 6000 8000 10000 FREQUENCY (MHz) M9999-082707 [email protected] or (408) 955-1690 Propagation Delay vs. Temperature 222 220 218 216 214 -40 -20 0 20 40 60 TEMPERATURE (C) 7 80 100 Precision Edge® SY58034U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 400mV, RL = 100ý across the output; TA = 25°C, unless otherwise stated. Output Swing (100mV/div.) 2.5GHz Output Output Swing (100mV/div.) 200MHz Output 5GHz Output 7GHz Output Output Swing (100mV/div.) TIME (50ps/div.) Output Swing (100mV/div.) TIME (600ps/div.) TIME (30ps/div.) M9999-082707 [email protected] or (408) 955-1690 TIME (20ps/div.) 8 Precision Edge® SY58034U Micrel, Inc. INPUT AND OUTPUT STAGES VCC VCC 50Ω IN 50Ω /Q Q 50Ω VT GND 50Ω /IN GND Figure 2a. Simplified Differential Input Stage Figure 2b. Simplified CML Output Stage INPUT INTERFACE APPLICATIONS VCC VCC VCC IN LVPECL IN CML SY58034U CML NC VREF-AC GND NC VT VCC Option: May connect VT to VCC. Figure 3a. CML Interface (DC-Coupled) GND /IN SY58034U GND /IN IN /IN SY58034U 0.01μF Figure 3b. CML Interface (AC-Coupled) VCC LVPECL Rpd IN SY58034U Rpd LVDS /IN GND VCC GND SY58034U VREF-AC 0.01μF VT For 3.3V, Rpd = 100Ω For 2.5V, Rpd = 50Ω Figure 3d. LVPECL Interface (AC-Coupled) M9999-082707 [email protected] or (408) 955-1690 GND VT NC VREF-AC NC VT Figure 3e. LVDS Interface 9 Rpd For 3.3V, Rpd = 50Ω. For 3.5V, Rpd = 19Ω. VT /IN VREF-AC VCC 0.01μF VREF-AC VCC IN NC Figure 3c. LVPECL Interface (DC-Coupled) Precision Edge® SY58034U Micrel, Inc. OUTPUT INTERFACE APPLICATIONS VCC VCC 50Ω 50Ω 50Ω 50Ω /Q /Q 50Ω 100Ω Q Q DC bias point per application 50Ω 16mA 16mA GND GND Figure 5. CML AC-Coupled Termination Figure 4. CML DC-Coupled Termination RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION Part Number Function Data Sheet Link 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 SY58036U 6GHz, 1:6 400mV LVPECL Fanout Buffer with 2:1 MUX Input and Internal Termination http://www.micrel.com/product-info/products/sy58036u.shtml HBW Solutions New Products and Applications www.micrel.com/product-info/products/solutions.shtml M9999-082707 [email protected] or (408) 955-1690 10 Precision Edge® SY58034U Micrel, Inc. 32-PIN QFN (QFN-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 QFN 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. M9999-082707 [email protected] or (408) 955-1690 11