Micrel, Inc. UlTRA-PRECISION 1:4 LVPECL FANOUT BUFFER/TRANSLATOR WITH internal terminatiON Precision Edge® ® SY89831U Precision Edge SY89831U FEATURES ■ Guaranteed AC performance over temperature and voltage: • DC-to > 2.0GHz throughput • <450ps propagation delay (IN-to-Q) • < 20ps within-device skew • < 225ps rise/fall time ■ Ultra-low jitter design: • < 62fs RMS phase jitter (Typ) ■ Unique patent-pending input termination and VT pin accepts DC- and AC-coupled differential inputs ■ 800mV, 100K LVPECL output swing Precision Edge® DESCRIPTION The SY89831U is a high-speed, 2GHz differential LVPECL 1:4 fanout buffer optimized for ultra-low skew applications. Within device skew is guaranteed to be less than 20ps (5ps typ.) over supply voltage and temperature. The differential input buffer has a unique internal termination design that allows access to the termination network through a VT pin. This feature allows the device to easily interface to different logic standards. A VREF–AC reference output is included for AC-coupled applications. The SY89831U is a part of Micrel's high-speed clock synchronization family. For applications that require a different I/O combination, consult Micrel’s website at: www. micrel.com, and choose from a comprehensive product line of high-speed, low-skew fanout buffers, translators and clock generators. ■ Power supply 2.5V ±5% or 3.3V ±10% ■ Industrial temperature range: –40°C to +85°C ■ Available in 16-pin (3mm x 3mm) MLF® package APPLICATIONS ■ ■ ■ ■ Processor clock distribution SONET clock distribution Fibre Channel clock distribution Gigabit Ethernet clock distribution FUNCTIONAL BLOCK DIAGRAM TYPICAL PERFORMANCE Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-072210 [email protected] or (408) 955-1690 1 Rev.: F Amendment: /0 Issue Date: July 2010 Precision Edge® SY89831U Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish SY89831UMI MLF-16 Industrial 831U Sn-Pb SY89831UMITR(2) MLF-16 Industrial 831U Sn-Pb SY89831UMG(3) MLF-16 Industrial 831U with Pb-Free NiPdAu bar-line indicator Pb-Free SY89831UMGTR(2, 3) MLF-16 Industrial 831U with Pb-Free NiPdAu 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. 3. Pb-Free package is recommended for new designs. 16-Pin MLF® (MLF-16) PIN DESCRIPTION Pin Number 15, 16 1, 2, 3, 4, 5, 6 Pin Name Pin Function Q0, /Q0 Q1, /Q1 Q2, /Q2 Q3, /Q3 Differential 100K LVPECL Outputs: These LVPECL outputs are the precision, low skew copies of the inputs. Please refer to the “Truth Table” section for details. Unused output pairs may be left open. Terminate wtih 50ý to VCC–2V. See “Output Termination Recommendations” section for more details. 8 EN This single-ended TTL/CMOS-compatible input functions as a synchronous output enable. The synchronous enable ensures that enable/disable will only occur when the outputs are in a logic LOW state. Note that this input is internally connected to a 25ký pull-up resistor and will default to logic HIGH state (enabled) if left open. 9, 12 /IN, IN Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs accept AC- or DC-Coupled differential signs 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 intermediate state if left open. Pleae refer to the “Input Interface Applications” section for more details. 10 VREF–AC Reference Voltage: These outputs bias to VCC–1.4V. They are used when AC coupling the inputs (IN, /IN). For AC-Coupled applications, connect VREF-AC to VT pin and bypass with 0.01µF low ESR capacitor to VCC. See “Input Interface Applications” section for more details. Maximum sink/source current is ±1.5mA. Due to the limited drive capability, each VREF-AC pin is only intended to drive its respective VT pin. If VREF-AC is used with a 2.5V supply, make sure input swing is large enough to not violate VIH min. spec. 11 VT Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT pins provide a center-tap to a termination network for maximum interface flexibility. See “Input Interface Applications” section for more detaiils. 13 GND Ground. GND pins and exposed pad must be connected to the most negative potential of the device ground. 7, 14 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors and place as close to each VCC pin as possible. TRUTH TABLE IN /IN EN Q /Q 0 1 1 0 1 1 0 1 1 0 0 0(1) 1(1) X X Note: 1. On next negative transition of the input signal (IN). M9999-072210 [email protected] or (408) 955-1690 2 Precision Edge® SY89831U Micrel, Inc. Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC).....................................–0.5V to +4.0V Input Voltage (VIN)..................................–0.5V to VCC +0.5V LVPECL Output Current (IOUT) Continuous........................................................... 50mA Surge................................................................. 100mA Input Current Source or Sink Current on (IN, /IN).................... ±50mA VREF-AC Current Source or Sink Current on (IVT)........................... ±2mA Lead Temperature (soldering, 20sec.)........................ 260°C Storage Temperature (TS)......................... –65°C to +150°C Supply Voltage Range.......................... +2.375V to +2.625V . ............................................................ +3.0V to +3.6V Ambient Temperature (TA)........................... –40°C to +85°C Package Thermal Resistance(3) MLF™ (θJA) Still-Air....................................................................... 60°C/W (ΨJB) Junction-to-Board....................................... 32°C/W DC ELECTRICAL CHARACTERISTICS(4) TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min VCC Power Supply ICC RIN Power Supply Current Typ Max Units 2.625 3.6 V 47 70 mA 55 ý 2.375 3.0 No load, max. VCC. 45 50 RDIFF-IN Differential Input Resistance (IN-to-/IN) 90 100 VIH Input HIGH Voltage (IN, /IN) 1.2 VIN Input Voltage Swing (IN, /IN) see Figure 1a. VDIFF_IN Differential Input Voltage Swing |IN – /IN| see Figure 1b. VREF–AC Output Reference Voltage VIL Input Resistance (IN-to-VT) Input LOW Voltage (IN, /IN) 0 110 ý VCC V 1.7 V VIH–0.1 0.1 0.2 VCC–1.525 VCC–1.425 VCC–1.325 V V V LVTTL/LVCMOS INPUT DC ELECTRICAL CHARACTERISTICS VCC = 2.375V to 3.60V; VEE = 0V; TA = –40°C to +85°C Symbol Parameter VIH Input HIGH Voltage 2.0 Input LOW Voltage 0 IIH Input HIGH Current –125 Input LOW Current –300 VIL IIL Condition Min Typ Max Units VCC V 0.8 V 20 µA µA 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 ratlng 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. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. ψJB and θJA values are determined for a 4-layer board in stil-air number, unless otherrwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. M9999-072210 [email protected] or (408) 955-1690 3 Precision Edge® SY89831U Micrel, Inc. LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS(6) VCC = +2.5V ±5% or +3.3V ±10%; RL = 50ý to VCC –2V; TA = –40°C to +85°C unless otherwise stated. Symbol Parameter Condition Min Typ Max Units VOH Output HIGH Voltage (Q, /Q) VCC–1.145 VCC–0.895 V VOL Output LOW Voltage (Q, /Q) VOUT Output Voltage Swing (Q, /Q) VCC–1.945 VCC–1.695 V See Figure 1a. 550 800 mV VDIFF_OUT Differential Output Voltage Swing (Q, /Q) See Figure 1b. 1100 1600 mV 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 IIH Input HIGH Voltage –125 Input LOW Voltage –300 VIL IIL Condition Min Typ 2.0 Input LOW Voltage Notes: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. M9999-072210 [email protected] or (408) 955-1690 4 Max Units VCC V 0.8 V 30 µA µA Precision Edge® SY89831U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(7) VCC = +2.5V ±5% or +3.3V ±10%; RL = 50ý to VCC –2V; TA = –40°C to +85°C unless otherwise stated. Symbol Parameter Condition Min fMAX Maximum Frequency VOUT ž 450mV tSKEW Within-Device Skew Note 8 Typ Max Units 2.0 2.5 GHz 390 ps 250 350 450 ps 5 20 ps Part-to-Part Skew Note 9 150 Set-Up Time EN to IN, /IN Note 10 300 ps tH Hold Time EN to IN, /IN Note 10 300 ps tJITTER RMS Phase Jitter Output = 622MHz Integration Range 12kHz - 20MHz 62 fs tr, tf Output Rise/Fall Times At full output swing. (20% to 80%) 150 ps tpd Propagation Delay tS IN-to-Q VIN ž 100mV IN-to-Q VIN ž 800mV 70 225 ps Notes: 7. High-frequency AC parameters are guaranteed by design and characterization. 8. Within device skew is measured between two different outputs under identical input transitions. 9. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the respective inputs. 10. Set-up and hold times apply to synchronous applications that intend to enable/disable before the next clock cycle. For asynchronous applications, set-up and hold times do not apply. Phase Noise M9999-072210 [email protected] or (408) 955-1690 5 Precision Edge® SY89831U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 3.3V, GND = 0V, RL = 50ý to VCC–2V, TA = 25°C, unless otherwise stated. Output Swing vs. Frequency 900 390 800 380 700 370 600 360 500 350 400 340 300 330 200 320 100 310 0 0 1000 2000 FREQUENCY (MHz) M9999-072210 [email protected] or (408) 955-1690 3000 Propagation Delay vs. Temperature 300 -40 -20 450 Propagation Delay vs. Input Voltage Swing 425 400 375 350 325 0 20 40 60 TEMPERATURE (°C) 6 80 100 300 100 300 500 700 INPUT VOLTAGE SWING (V) 900 Precision Edge® SY89831U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 3.3V, GND = 0V, VIN = 800mV, RL = 50ý to VCC–2V, TA = 25°C, unless otherwise stated. M9999-072210 [email protected] or (408) 955-1690 7 Precision Edge® SY89831U Micrel, Inc. SINGLE-ENDED AND DIFFERENTIAL SWINGS Figure 1b. Differential Swing Figure 1a. Single-Ended Swing INPUT AND OUTPUT STAGES Figure 2a. Simplified Differential M9999-072210 [email protected] or (408) 955-1690 Figure 2b. Simplified LVPECL Output Stage 8 Precision Edge® SY89831U Micrel, Inc. INPUT INTERFACE APPLICATIONS For 2.5V, Rpd = 50ý For 3.3V, Rpd = 100ý Figure 3a. DC-Coupled LVPECL Input Interface Figure 3b. AC-Coupled LVPECL Input Interface Figure 3d. AC-Coupled CML Input Interface Figure 3e. LVDS Interface M9999-072210 [email protected] or (408) 955-1690 9 Figure 3c. DC-Coupled CML Input Interface Precision Edge® SY89831U Micrel, Inc. OUTPUT TERMINATION RECOMMENDATIONS Figure 5. Three-Resistor “Y-Termination” Figure 4. Parallel Termination— Thevenin Equivalent Notes: 1. Power-saving alternative to Thevenin termination. Note: 2. Place termination resistors as close to destination inputs as possible. 1. For +2.5V systems: R1 = 250ý, R2 = 62.5ý. 3. Rb resistor sets the DC bias voltage, equal to Vt. For +2.5V systems Rb = 19ý. 4. C1 is an optional bypass capacitor intended to compensate for any tr/tf mismatches. RELATED PRODUCT and support documentation Part Number Function Data Sheet Link SY89830U 1:4 LVPECL Fanout Buffer w/2:1 MUX Input www.micrel.com/product-info/products/sy89830u.shtml SY89832U 2.5V Ultra-Precision 1:4 LVDS Fanout Buffer/ Translator with Internal Termination www.micrel.com/product-info/products/sy89832u.shtml SY89833U 3.3V Ultra-Precision 1:4 LVDS Fanout Buffer/ Translator with Internal Termination www.micrel.com/product-info/products/sy89833u.shtml SY89834U 2.5/3.3V Two Input, 1GHz LVTTL/CMOS-to-LVPECL www.micrel.com/product-info/products/sy89833u.shtml 1:4 Fanout Buffer/Translator HBW Solutions New Products and Applications www.micrel.com/product-info/products/solutions.shtml 16-MLF® Manufacturing Guidelines Exposed Pad Application Note M9999-072210 [email protected] or (408) 955-1690 www.amkor.com/products/notes_papers/MLF_AppNote_0301.pdf 10 Precision Edge® SY89831U Micrel, Inc. 16-PIN EPAD MicroLeadFrame® (mlf-16) PCB Thermal Consideration for 16-Pin MLF® Package (Always solder, or equivalent, the exposed pad to the PCB) Package Notes: Note 1. Package meets Level 2 moisture sensitivity classification, and are shipped in dry-pack form. Note 2. 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 datasheet 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. M9999-072210 [email protected] or (408) 955-1690 11