Ultra-precision 1:8 Fanout Buffer

Micrel ULTRA-PRECISION 1:8 FANOUT BUFFER WITH 400mV CML OUTPUTS AND INTERNAL I/O TERMINATION Precision Edge™ SY58031U Precision Edge™ SY58031U FEATURES s Precision 1:8, 400mV CML fanout buffer Precision Edge™ s Guaranteed AC performance over temperature and voltage: DESCRIPTION • Clock frequency range: DC to 5GHz • <65ps tr / tf times The SY58031U is a 2.5V/3.3V precision, high-speed, fully • <300ps tpd differential CML 1:8 fanout buffer. The SY58031U is • <20ps skew optimized to provide eight identical output copies with less s Low-jitter performance: than 20ps of skew and less than 10psp-p total jitter. It can • <10pspp total jitter (clock) process clock signals as fast as 5GHz. • <1psrms random jitter The differential input includes Micrel’s unique, 3-pin input s 50Ω source-terminated CML outputs termination architecture that allows the SY58031U to directly interface to CML, LVPECL, and LVDS differential signals s 400mV CML output swing into 50Ω load (AC- or DC-coupled) without any level-shifting or termination s Fully differential I/O resistor networks in the signal path. The result is a clean, s Accepts an input signal as low as 100mV stub-free, low-jitter interface solution. The CML outputs s Unique input termination and VT pin accepts DCfeature 400mV typical swing into 50Ω loads and provide an coupled and AC-coupled differential inputs: extremely fast rise/fall time guaranteed to be less than 65ps. (LVPECL, LVDS, and CML) The SY58031U operates from a 2.5V ±5% supply or s Power supply 2.5V ±5% or 3.3V ±10% 3.3V ±10% supply and is guaranteed over the full industrial temperature range (–40°C to +85°C). For applications that s Industrial temperature range: –40°C to +85°C require high-speed 1:8 LVPECL fanout buffers, consider s Available in 32-pin (5mm × 5mm) MLF™ package www.DataSheet4U.com the SY58032U and SY58033U. The SY58031U 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. APPLICATIONS s s s s All SONET and all GigE clock distribution All Fibre Channel clock and data distribution Network routing engine timing distribution High-end, low-skew multiprocessor synchronous clock distribution FUNCTIONAL BLOCK DIAGRAM Q0 /Q0 Q1 /Q1 Q2 /Q2 IN 50Ω VT 50Ω /IN Q3 /Q3 Q4 /Q4 VREF-AC Q5 /Q5 Q6 /Q6 Q7 Precision Edge is a trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. M9999-022604 hbwhelp@micrel.com or (408) 955-1690 Rev.: A /Q7 Amendment: /0 1 Issue Date: February 2004 Micrel Precision Edge™ SY58031U PACKAGE/ORDERING INFORMATION VCC Q0 /Q0 Q1 /Q1 Q2 /Q2 VCC Ordering Information(1) GND VCC Q3 /Q3 Q4 /Q4 VCC GND VCC GND IN VT VREF_AC /IN GND VCC 1 2 3 4 5 6 7 8 32 3130 29 28 27 26 25 24 23 22 21 20 19 18 17 9 10 11 12 13 14 15 16 Part Number SY58031UMI SY58031UMITR(2) Notes: Package Type MLF-32 MLF-32 Operating Range Industrial Industrial Package Marking SY58031U SY58031U 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C,DC electricals only. 2. Tape and Reel. 32-Pin MLF™ PIN DESCRIPTION Pin Number 3, 6 Pin Name IN, /IN Pin Function Differential Signal Input: Each pin of this pair internally terminates with 50Ω to the VT pin. Note that this input will default to an indeterminate state if left open. See “Input Interface Applications” section. Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a center-tap for each input (IN, /IN) to the termination network for maximum interface flexibility. See “Input Interface Applications” section. Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors as close to the pins as possible. CML Differential Output Pairs: Differential buffered output copy of the input signal. The CML output swing is typically 400mV into 50Ω. Unused output pairs may be left floating with no impact on jitter. See “CML Output Termination” section. Bias Reference Voltage: Equal to VCC–1.2V (typical), and used for AC-coupled applications. See “Input Interface Applications” section. When using VREF-AC, bypass with 0.01µF capacitor to VCC. Maximum sink/source current is 0.5mA. 4 2, 7, 17, 24 1, 8, 9, 16 18, 23, 25, 32 31, 30, 29, 28, 27, 26, 22, 21, 20, 19, 15, 14, 13, 12, 11, 10 5 GND, Exposed Pad VCC Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5, Q6, /Q6, Q7, /Q7 VREF-AC M9999-022604 hbwhelp@micrel.com or (408) 955-1690 VCC /Q7 Q7 /Q6 Q6 /Q5 Q5 VCC VT 2 Micrel Precision Edge™ SY58031U Absolute Maximum Ratings(1) Power Supply Voltage (VCC ) ...................... –0.5V to +4.0V Input Voltage (VIN) ......................................... –0.5V to VCC Current (VT) Source or sink current on VT pin ........................ ±100mA Input Current (VT) Source or sink current on IN, /IN .......................... ±50mA Current (VREF) Source or sink current on VREF-AC(3) ....................... ±1.5mA Lead Temperature Soldering, (10 sec.) .................... 265°C Storage Temperature Range (TS ) ........... –65°C to +150°C Operating Ratings(2) Power Supply Voltage (VCC) ................. +2.375V to +3.60V Ambient Temperature Range (TA) ............. –40°C to +85°C Package Thermal Resistance(4) MLF™ (θJA) Still-Air ............................................................. 35°C/W MLF™ (ψJB) Junction-to-Board ............................................ 20°C/W DC ELECTRICAL CHARACTERISTICS(5) TA= –40°C to +85°C Symbol VCC ICC VIH VIL VIN VDIFF_IN RIN VT IN VREF-AC Parameter Power Supply Voltage Power Supply Current Input HIGH Voltage Input LOW Voltage Input Voltage Swing Differential Input Voltage Swing |IN0, /IN0|, |IN1, /IN1| In-to-VT Resistance Max. In-to-VT (IN, /IN) Condition 2.5V nominal 3.3V nominal VCC = max. no lead. Includes current through 50Ω pull-ups. IN1, /IN1, Note 6 IN1, /IN1 IN1, /IN1, see Figure 1a. IN1, /IN1, see Figure 1b. VCC–1.6 0 0.1 0.2 40 50 60 1.28 VCC–1.3 VCC–1.2 VCC–1.1 Min 2.375 3.0 Typ 2.5 3.3 265 Max 2.625 3.6 330 VCC VIH–0.1 1.7 Units V V mA V V V V Ω V V CML DC ELECTRICAL CHARACTERISTICS(5) VCC = 2.5V ±5% or 3.3V ±10%; RL = 100Ω across Q and /Q; TA= –40°C to +85°C, unless otherwise stated. Symbol VOH VOUT VDIFF_OUT ROUT 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. Due to the limited drive capability, use for input of the same package only. 4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential (GND) on the PCB. ψJB uses 4-layer θJA in still-air number unless otherwise stated. 5. The circuit is designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established. 6. VIH(min) not lower than 1.2V. M9999-022604 hbwhelp@micrel.com or (408) 955-1690 Parameter Output HIGH Voltage Output Voltage Swing Differential Voltage Swing Output Source Impedance Condition Min VCC–0.020 Typ Max VCC Units V mV mV Ω see Figure 1a. see Figure 1b. 325 650 40 400 800 50 60 3 Micrel Precision Edge™ SY58031U AC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; RL = 100Ω across each output pair or equivalent; TA = –40°C to +85°C, unless otherwise stated. Symbol fMAX tpd tpd tempco tSKEW tJITTER Parameter Maximum Operating Frequency Propagation Delay (IN-to-Q) Condition VOUT ≥ 200mV Clock Min 5 150 230 35 Note 8 Note 9 Cycle-to-Cycle Total Jitter (Clock) Random Jitter (RJ) t r, t f Notes: 7. 8. 9. High frequency AC electricals are guaranteed by design and characterization. All outputs loaded, VIN ≥100mV. Output-to-output skew is measured between outputs under identical transitions. 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. Part-to-part skew includes variation in tpd. Typ Max Units GHz 300 ps fs/°C Differential Propagation Delay Temperature Coefficient Output-to-Output (Within Device) Part-to-Part Clock 7 20 100 1 10 1 ps ps psrms psp-p psrms ps Note 10 Note 11 Note 12 20% to 80%, at full output swing 30 50 Output Rise/Fall Time 65 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. 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. 12. Random jitter is measured with a K28.7 comma detect character pattern, measured at 1.25Gbps and 2.5Gbps. SINGLE-ENDED AND DIFFERENTIAL SWINGS VIN, VOUT 400mV (Typ.) VDIFF_IN, VDIFF_OUT 800mV (Typ.) Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing TIMING DIAGRAM /IN VIN IN tpd /Q VOUT Q tpd M9999-022604 hbwhelp@micrel.com or (408) 955-1690 4 Micrel Precision Edge™ SY58031U TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 200MHz Output 2GHz Output Output Swing (100mV/div.) Output Swing (100mV/div.) TIME (600ps/div.) 5GHz Output TIME (100ps/div.) Output Swing (100mV/div.) TIME (25ps/div.) Amplitude vs. Frequency ∆ Output-to-Output Skew vs. Temperature 4.0 3.5 3.0 450 400 AMPLITUDE (mV) 350 300 250 200 150 100 50 0 0 ∆ SKEW (ps) VIN = 200mV 1000 2000 3000 4000 5000 6000 7