Ultra-precision 1:8 Fanout Buffer

Micrel ULTRA-PRECISION 1:8 FANOUT SY58033U BUFFER WITH 400mV LVPECL OUTPUTS Precision Edge™ SY58033U AND INTERNAL TERMINATION Precision Edge™ FEATURES s Precision 1:8, 400mV LVPECL fanout buffer s Guaranteed AC performance over temperature and voltage: • Clock frequency range: DC to 5.5GHz • <80ps tr / tf times • <280ps tpd • <20ps skew s Low-jitter performance: • <10pspp total jitter (clock) • <1psrms random jitter (data) s 100k LVPECL compatible outputs s Fully differential inputs/outputs s Accepts an input signal as low as 100mV s Unique input termination and VT pin accepts DC-coupled and AC-coupled differential inputs: (LVPECL, LVDS, and CML) s Power supply 2.5V ±5% or 3.3V ±10% s Industrial temperature range: –40°C to +85°C s Available in 32-pin (5mm × 5mm) MLF™ Package Precision Edge™ DESCRIPTION The SY58033U is a 2.5V/3.3V precision, high-speed, fully differential 400mV LVPECL 1:8 fanout buffer. The SY58033U is optimized to provide eight identical output copies with less than 20ps of skew and less than 10pspp total jitter. It can process clock signals as fast as 5.5GHz. The differential input includes Micrel’s unique, 3-pin input termination architecture that allows the SY58033U to directly interface to LVPECL, CML, and LVDS differential signal (ACor DC-coupled) without any level-shifting or termination resistor networks in the signal path. The result is a clean, stub-free, low-jitter solution. The LVPECL (100k temperature compensated) outputs feature a 400mV typical swing into 50Ω loads, and provide an extremely fast rise/fall time guaranteed to be less than 80ps. The SY58033U operates from a 2.5V ±5% supply or 3.3V ±10% supply and is guaranteed over the full industrial temperature range (–40°C to +85°C). Other high-speed 1:8 www.DataSheet4U.com fanout buffers include the CML SY58031U and the 800mV LVPECL SY58032U. The SY58033U is part of Micrel’s highspeed, 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-xxxx hbwhelp@micrel.com or (408) 955-1690 Rev.: A /Q7 Amendment: /0 1 Issue Date: February 2004 Micrel Precision Edge™ SY58033U 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 SY58033UMI SY58033UMITR(2) Notes: Package Type MLF-32 MLF-32 Operating Range Industrial Industrial Package Marking SY58033U SY58033U 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. 400mV LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The LVPECL output swing is typically 400mV into 50Ω. Unused output pairs may be left floating with no impact on jitter. See “LVPECL Output” section. Bias Reference Voltage: Equal to VCC–1.2V (approx.), 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-xxxx hbwhelp@micrel.com or (408) 955-1690 VCC /Q7 Q7 /Q6 Q6 /Q5 Q5 VCC VT 2 Micrel Precision Edge™ SY58033U 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. load includes current through 50Ω pull-ups. IN, /IN; Note 6 IN, /IN IN, /IN, see Figure 1a. IN, /IN, 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 3.3 180 Max 2.625 3.6 250 VCC VIH–0.1 1.7 Units V V mA V V V V Ω V V LVPECL DC ELECTRICAL CHARACTERISTICS(5) 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 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 table after thermal equilibrium has been established. 6. VIH (min) not lower than 1.2V. Parameter Output HIGH Voltage Output LOW Voltage Output Voltage Swing Differential Voltage Swing Condition Min VCC–1.145 VCC–1.545 Typ Max VCC–0.895 VCC–1.295 Units V V mV mV see Figure 1a. see Figure 1b. 150 300 400 800 M9999-xxxx hbwhelp@micrel.com or (408) 955-1690 3 Micrel Precision Edge™ SY58033U 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 fMAX tpd tpd tempco tSKEW tJITTER Parameter Maximum Operating Frequency Propagation Delay (IN-to-Q) Condition VOUT ≥ 200mV Clock Min 5.5 130 200 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 with 50Ω to VCC–2V, VIN ≥ 100mV. Output-to-output skew is measured between outputs under identical conditions. 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 280 ps fs/°C Differential Propagation Delay Temperature Coefficient Output-to-Output Skew (within device) Part-to-Part Skew Clock 7 20 100 1 10 1 ps ps psrms pspp psrms ps Note 10 Note 11 Note 12 20% to 80%, at full output swing. 20 50 Output Rise/Fall Time 80 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-xxxx hbwhelp@micrel.com or (408) 955-1690 4 Micrel Precision Edge™ SY58033U TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 200MHz Output 2GHz Output Output Swing (100mV/div.) TIME (600ps/div.) 5GHz Output Output Swing (100mV/div.) TIME (70ps/div.) Output Swing (100mV/div.) TIME (25ps/div.) Amplitude vs. Frequency ∆ Output-to-Output Skew vs. Temperature 3.0 2.5 450 400 AMPLITUDE (mV) 350 250 200 150 100 300 ∆ SKEW (ps) 6000 11000 2.0 1.5 1.0 0.5 0.0 -50 -30 -10 10 30