SY89831U Ultra-Precision 1:4 LVPECL Fanout Buffer/Translator with Internal Termination Precision Edge(R) General 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. Datasheets and support documentation are available on Micrel's web site at: www.micrel.com. Precision Edge(R) Features * Guaranteed AC performance over temperature and voltage - DC-to 2.5GHz throughput (typical) - 350ps propagation delay (IN-to-Q) (typical) - 5ps within-device skew (typical) - 150ps rise/fall time (typical) * Ultra-low jitter design - 62fs RMS phase jitter (typical) * Unique patent-pending input termination and VT pin accepts DC- and AC-coupled differential inputs * 800mV, 100K LVPECL typical output swing * Power supply 2.5V 5% or 3.3V 10% * Industrial temperature range: -40C to +85C * Available in 16-pin (3mm x 3mm) MLF(R) package Applications * * * * Processor clock distribution SONET clock distribution Fibre Channel clock distribution Gigabit Ethernet clock distribution Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com January 17, 2014 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Ordering Information(1) Part Number (2) SY89831UMG (2, 3) SY89831UMGTR Package Type Operating Range Package Marking Lead Finish MLF-16 Industrial 831U with Pb-Free bar-line indicator NiPdAu Pb-Free MLF-16 Industrial 831U with Pb-Free bar-line indicator NiPdAu Pb-Free Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC electricals only. 2. Pb-Free package is recommended for new designs. 3. Tape and Reel. Pin Configuration 16-MLF (MLF-16) Pin Description Pin # Pin Name 15, 16 1, 2 3, 4 5, 6 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 with 50 to VCC - 2V. See the "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 only occurs when the outputs are in a logic low state. Note that this input is internally connected to a 25k 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 ACor DC-coupled differential signs as small as 100mV. Each pin of a pair internally terminates to a VT pin through 50. Note that these inputs default to an intermediate state if left open. Please 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 the VT pin and bypass with a 0.01F lowESR capacitor to VCC. See the "Input Interface Applications" section for more details. Maximum sink/source current is 1.5mA. Due to the limited drive capability, each VREF-AC pin should only drive its respective VT pin. If VREF-AC is used with a 2.5V supply, make sure the input swing is large enough to comply with the VIH min. spec. January 17, 2014 Functional Description 2 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Pin # Pin Name Functional Description 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 the "Input Interface Applications" section for more details. 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 0.1F/0.01F low-ESR capacitors placed as close as possible to each VCC pin. Truth Table IN /IN EN Q /Q 0 1 1 0 1 1 0 1 1 0 0 (4) X X 0 1 (4) Note: 4. On the next negative transition of the input signal (IN). January 17, 2014 3 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Absolute Maximum Ratings(5) Operating Ratings(6) 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, 20s) ............................ 260C Storage Temperature (Ts)......................... -65C to +150C Supply Voltage Range ......................... +2.375V to +2.625V ............................................................... +3.0V to +3.6V Ambient Temperature (TA) .......................... -40C to +85C (7) Package Thermal Resistance (JA) Still Air........................................................ 60C/W (JA) Junction to Board ....................................... 32C/W DC Electrical Characteristics(8) TA = -40C to +85C, unless otherwise noted. Symbol Parameter VCC Power Supply ICC Power Supply Current RIN Input Resistance (IN-to-VT) RDIFF-IN Condition Min. Typ. Max. Units 2.625 3.6 V 47 70 mA 45 50 55 Differential Input Resistance (IN-to-/IN) 90 100 110 VIH Input HIGH Voltage (IN, /IN) 1.2 VCC V VIL Input LOW Voltage (IN, /IN) 0 VIH - 0.1 V VIN Input Voltage Swing (IN, /IN) See Figure 1. 0.1 1.7 V VDIFF_IN Differential Input Voltage Swing |IN - /IN| See Figure 2. 0.2 VREF-AC Output Reference Voltage 2.375 3.0 No load, max. VCC V VCC - 1.525 VCC - 1.425 VCC - 1.325 V Max. Units LVTTL/LVCMOS Input DC Electrical Characteristics VCC = 2.375V to 3.60V; VEE = 0V; TA = -40C to +85C Symbol Parameter Condition Min. Typ. VIH Input HIGH Voltage 2.0 VCC V VIL Input LOW Voltage 0 0.8 V IIH Input HIGH Current -125 20 A IIL Input LOW Current -300 A Notes: 5. 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 datasheet. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 6. The datasheet limits are not guaranteed if the device is operated beyond the operating ratings. 7. Package thermal resistance assumes the exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB. JB and JA values are determined for a 4-layer board at the still-air package thermal resistance, unless otherwise stated. 8. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. January 17, 2014 4 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U LVPECL Output DC Electrical Characteristics(8) VCC = 2.5V 5% or 3.3V 10%; RL = 50 to VCC - 2V; TA = -40C to + 85C, unless otherwise noted. 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) VCC - 1.945 VCC - 1.695 V VOUT Output Voltage Swing (Q, /Q) See Figure 1. 550 800 mV VDIFF_OUT Differential Output Voltage Swing (Q, /Q) See Figure 2. 1100 1600 mV LVTTL/LVCMOS DC Electrical Characteristics(8) VCC = 2.5V 5% or 3.3V 10%; TA = -40C to + 85C, unless otherwise noted. Symbol Parameter Condition VIH Input HIGH Voltage VIL Min. Typ. Max. Units 2.0 VCC V Input LOW Voltage 0 0.8 V IIH Input HIGH Current -125 30 A IIL Input LOW Current -300 A AC Electrical Characteristics(9) VCC = 2.5V 5% or 3.3V 10%; RL = 50 to VCC - 2V; TA = -40C to + 85C, unless otherwise noted. Symbol Parameter Condition fMAX Maximum Frequency VOUT 450mV tpd Propagation Delay tSKEW IN-to-Q VIN 100mV IN-to-Q VIN 800mV Min. Typ. 2.0 2.5 GHz 390 ps 250 Max. Units 350 450 ps 5 20 ps 150 ps Within-Device Skew Note 10 Part-to-Part Skew Note 11 tS Set-Up Time EN to IN, /IN Note 12 300 ps tH Hold Time EN to IN, /IN Note 12 300 ps tJITTER RMS Phase Jitter Output = 622MHz Integration Range 12kHz-20MHz tr , tf Output Rise/Fall Times (20% to 80%) At full output swing 70 150 225 ps Duty Cycle Freq. < 630MHz 48 50 52 % 62 fs Notes: 9. High-frequency AC parameters are guaranteed by design and characterization. 10. Within-device skew is measured between two different outputs under identical input transitions. 11. 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. 12. Set-up and hold times apply to synchronous applications that will enable/disable before the next clock cycle. For asynchronous applications, set-up and hold times do not apply. January 17, 2014 5 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Typical Phase Noise SY89831U Phase Noise vs Frequency 3.3V, 622MHz, 12kHz-20MHz Additive -100.00 -110.00 Phase Noise (dBc/Hz) -120.00 -130.00 -140.00 -150.00 -160.00 -170.00 -180.00 0.01 1 0.1 100 10 Offset Frequency (MHZ) Millions SY89831U Phase Noise vs Frequency 3.3V, 156.25MHz, 12kHz-20MHz Additive -100.00 -110.00 Phase Noise (dBc/Hz) -120.00 -130.00 -140.00 -150.00 -160.00 -170.00 -180.00 0.001 0.01 0.1 1 Offset Frequency (MHZ) January 17, 2014 6 10 100 Millions Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Typical Characteristics VCC = 3.3V; GND = 0V; RL = 50 to VCC - 2V; TA = 25C, unless otherwise noted. January 17, 2014 7 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Typical Output Waveforms VCC = 3.3V; GND = 0V; VIN = 800mV; RL = 50 to VCC - 2V; TA = 25C, unless otherwise noted. January 17, 2014 8 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Functional Block Diagram January 17, 2014 9 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Single-Ended and Differential Swings Figure 1. Single-Ended Swing Figure 2. Differential Swing Input and Output Stages Figure 3. Simplified Differential January 17, 2014 Figure 4. Simplified LVPECL Output Stage 10 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Input Interface Applications Figure 5. DC-Coupled LVPECL Input Interface Figure 6. AC-Coupled LVPECL Input Interface Figure 7. DC-Coupled CML Input Interface Figure 8. AC-Coupled CML Input Interface Figure 9. DC-Coupled LVDS Input Interface Figure 10. AC-Coupled LVDS Input Interface January 17, 2014 11 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Output Termination Recommendations Figure 11. Parallel Termination - Thevenin Equivalent Note: 13. For +2.5V Systems: R1 = 250, R2 = 62.5. Figure 12. Three-Resistor "Y-Termination" Notes: 14. Power-saving alternative to Thevenin termination. 15. Place termination resistors as close to destination inputs as possible. 16. The Rb resistor sets the DC bias voltage equal to Vt. For +2.5V systems, Rb = 19. 17. C1 is an optional bypass capacitor that compensates for any tr/tf mismatches. January 17, 2014 12 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Related Product and Support Documentation Part Number Function Data Sheet Link SY89830U 1:4 LVPECL Fanout Buffer w/2:1 MUX Input http://www.micrel.com/index.php/en/products/clocktiming/clock-data-distribution/fanout-buffers/article/51sy89830u.html SY89832U 2.5V Ultra-Precision 1:4 LVDS Fanout Buffer/ Translator with Internal Termination http://www.micrel.com/index.php/en/products/clocktiming/clock-data-distribution/fanout-buffers/article/38sy89832u.html SY89833AL 3.3V Ultra-Precision 1:4 LVDS Fanout Buffer/Translator with Internal Termination http://www.micrel.com/index.php/en/products/clocktiming/clock-data-distribution/fanout-buffers/article/39sy89833al.html SY89834U 2.5/3.3V Two Input, 1GHz LVTTL/CMOS-toLVPECL 1:4 Fanout Buffer/Translator http://www.micrel.com/index.php/en/products/clocktiming/clock-data-distribution/fanout-buffers/article/50sy89834u.html 16-MLF(R) Manufacturing Guidelines Exposed Pad Application Note www.amkor.com/products/notes_papers/MLF_AppNote_0 301.pdf January 17, 2014 13 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89831U Package Information(18) PCB Thermal Consideration for 16-Pin MLF Package (Always solder, or equivalent, the exposed pad to the PCB) (R) 16-Pin EPAD MicroLeadFrame (MLF-16) Notes: 18. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. 19. Package meets Level 2 moisture sensitivity classification, and is shipped in dry-pack. 20. 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel's terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. 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 a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2014 Micrel, Incorporated. January 17, 2014 14 Revision 7.0 hbwhelp@micrel.com or (408) 955-1690 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Micrel: SY89831UMG SY89831UMG TR SY89831UMG-TR