SY58607U 3.2Gbps Precision, 1:2 LVPECL Fanout Buffer with Internal Termination and Fail Safe Input General Description The SY58607U is a 2.5/3.3V, high-speed, fully differential 1:2 LVPECL fanout buffer optimized to Precision Edge® provide two identical output copies with less than 20ps Features of skew and less than 10ps total jitter. The SY58607U pp • Precision 1:2, 800mV LVPECL fanout buffer can process clock signals as fast as 2.5GHz or data patterns up to 3.2Gbps. • Guaranteed AC performance over temperature and voltage: The differential input includes Micrel’s unique, 3-pin – DC-to > 3.2Gbps throughput input termination architecture that interfaces to LVPECL, LVDS or CML differential signals, (AC- or DC-coupled) – <350ps propagation delay (IN-to-Q) as small as 100mV (200mV ) without any level-shifting – <20ps within-device skew pp or termination resistor networks in the signal path. For – <110ps rise/fall times AC-coupled input interface applications, an integrated • Fail Safe Input voltage reference (V ) is provided to bias the V pin. REF-AC T – Prevents outputs from oscillating when input is The outputs are 800mV LVPECL, with extremely fast invalid rise/fall times guaranteed to be less than 110ps. • Ultra-low jitter design The SY58607U operates from a 2.5V ±5% supply or – 85fs RMS phase jitter 3.3V ±10% supply and is guaranteed over the full • High-speed LVPECL outputs industrial temperature range (–40°C to +85°C). For applications that require CML or LVDS outputs, consider • 2.5V ±5% or 3.3V ±10% power supply operation the SY58606U and SY58608U, 1:2 fanout buffers with • Industrial temperature range: –40°C to +85°C 400mV and 325mV output swings respectively. The • Available in 16-pin (3mm x 3mm) QFN package SY58607U is part of Micrel’s high-speed, Precision Edge® product line. Applications Datasheets and support documentation can be found on • All SONET clock and data distribution Micrel’s web site at: www.micrel.com. • Fibre Channel clock and data distribution • Gigabit Ethernet clock and data distribution Functional Block Diagram • Backplane distribution Markets • Storage • ATE • Test and measurement • Enterprise networking equipment • High-end servers • Access • Metro area network equipment Precision Edge is a registered trademark of Micrel, 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 Oct. 1, 2013 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U (1) Ordering Information Part Number Package Operating Package Marking Lead Type Range Finish SY58607UMG QFN-16 Industrial 607U with Pb-Free NiPdAu bar-line indicator Pb-Free SY58607UMGTR(2) QFN-16 Industrial 607U 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. Pin Configuration 16-Pin QFN Pin Description Pin Number Pin Name Pin Function 1, 4 IN, /IN Differential Input: This input pair is the differential signal input to the device. Input accepts DC-coupled differential signals as small as 100mV (200mVpp). Each pin of this pair internally terminates with 50Ω to the VT pin. If the input swing falls below a certain threshold (typical 30mV), the Fail Safe Input (FSI) feature will guarantee a stable output by latching the output to its last valid state. See “Input Interface Applications” subsection. 2 VT Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a center-tap for each input (IN, /IN) to a termination network for maximum interface flexibility. See “Input Interface Applications” subsection. 4 VREF-AC Reference Voltage: This output biases to VCC–1.2V. It is used for AC-coupling inputs IN and /IN. Connect VREF-AC directly to the corresponding VT pin. Bypass with 0.01µF low ESR capacitor to VCC. Maximum sink/source current is ±1.5mA. See “Input Interface Applications” subsection. 5, 8,13, 16 VCC Positive Power Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to the VCC pins as possible. 6, 7, 14, 15 GND, Ground: Exposed pad must be connected to a ground plane that is the same potential as the ground pins. Exposed pad 9, 10 /Q1, Q1 LVPECL Differential Output Pairs: Differential buffered copies of the input signal. The output swing is typically 800mV. Unused output pair may be left floating with 11, 12 /Q0, Q0 no impact on jitter. See “LVPECL Output Termination” subsection. Oct. 1, 2013 2 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U (1) (2) Absolute Maximum Ratings Operating Ratings Supply Voltage (V ) ............................... –0.5V to +4.0V Supply Voltage (V ) ........................ +2.375V to +3.60V CC IN Input Voltage (V ) ....................................... –0.5V to V Ambient Temperature (T ) ................... –40°C to +85°C IN CC A LVPECL Output Current(I ) Package Thermal Resistance(3) OUT Continuous ....................................................... 50mA QFN Surge ............................................................. 100mA Still-air (θ ) ............................................ 60°C/W JA Current (VT) Junction-to-board (ψJB) ......................... 33°C/W Source or sink on VT pin ............................. ±100mA Input Current Source or sink Current on (IN, /IN) ................ ±50mA Current (V ) REF Source or sink current on V (4) .............. ±1.5mA REF-AC Maximum operating Junction Temperature .......... 125°C Lead Temperature (soldering, 20sec.) .................. 260°C Storage Temperature (T ) .................... –65°C to +150°C s (5) DC Electrical Characteristics T = –40°C to +85°C, unless otherwise stated. A Symbol Parameter Condition Min Typ Max Units VCC Power Supply Voltage Range 2.375 2.5 2.625 V 3.0 3.3 3.6 ICC Power Supply Current No load, max. VCC 40 60 mA RDIFF_IN Differential Input Resistance 90 100 110 Ω (IN-to-/IN) VIH Input HIGH Voltage IN, /IN, Note 7 (IN, /IN) VCC–1.6 VCC V VIL Input LOW Voltage IN, /IN (IN, /IN) 0 VIH–0.1 V VIN Input Voltage Swing see Figure 3a, Note 6 0.1 1.7 V (IN, /IN) VDIFF_IN Differential Input Voltage Swing see Figure 3b 0.2 V (|IN - /IN|) VIN_FSI Input Voltage Threshold that 30 100 mV Triggers FSI VREF-AC Output Reference Voltage VCC–1.3 VCC–1.2 VCC–1.1 V IN to VT 1.28 V 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. 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 still-air number, unless otherwise stated. 4. Due to the limited drive capability, use for input of the same package only. 5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 6. VIN (max) is specified when VT is floating. 7. VIH (min) not lower than 1.2V. Oct. 1, 2013 3 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U (7) LVPECL Outputs DC Electrical Characteristics V = +2.5V ±5% or +3.3V ±10%, R = 50Ω to V -2V; T = –40°C to +85°C, unless otherwise stated. CC L CC A Symbol Parameter Condition Min Typ Max Units VOH Output HIGH Voltage Q0, /Q0, Q1, /Q1 VCC-1.145 VCC -0.895 V VOL Output LOW Voltage Q0, /Q0, Q1, /Q1 VCC-1.945 VCC-1.695 V VOUT Output Voltage Swing See Figure 3a 550 800 950 mV VDIFF_OUT Differential Output Voltage Swing See Figure 3b 1100 1600 mV Notes: 7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Oct. 1, 2013 4 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U AC Electrical Characteristics V = +2.5V ±5% or +3.3V ±10%, R = 50Ω to V -2V, Input t/t: <300ps; T = –40°C to +85°C, unless otherwise CC L CC r f A stated. Symbol Parameter Condition Min Typ Max Units fMAX Maximum Frequency NRZ Data 3.2 4.25 Gbps VOUT > 400mV Clock 2.5 3 GHz tPD Propagation Delay IN-to-Q VIN: 100mV-200mV 180 300 450 ps VIN: 200mV-800mV 150 230 350 ps tSkew Within Device Skew Note 8 4 20 ps Part-to-Part Skew Note 9 135 ps tJitter RMS Phase Jitter Output = 622MHz 85 fs Integration Range 12kHz – 20MHz tr, tf Output Rise/Fall Time At full output swing. 40 75 110 ps (20% to 80%) Duty Cycle Differential I/O 47 53 % Notes: 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. Oct. 1, 2013 5 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U Functional Description Input Clock Failure Case Fail-Safe Input (FSI) If the input clock fails to a floating, static, or extremely low signal swing, the FSI function will eliminate a The input includes a special failsafe circuit to sense metastable condition and guarantee a stable output. the amplitude of the input signal and to latch the No ringing and no undetermined state will occur at the outputs when there is no input signal present, or output under these conditions. when the amplitude of the input signal drops sufficiently below 100mV (200mV ), typically Note that the FSI function will not prevent duty cycle PK PP 30mV . Maximum frequency of SY58607U is limited distortion in case of a slowly deteriorating (but still PK by the FSI function. toggling) input signal. Due to the FSI function, the propagation delay will depend on rise and fall time of the input signal and on its amplitude. Refer to “Typical Characteristics” for detailed information. Timing Diagrams Figure 1a. Propagation Delay Figure 1b. Fail Safe Feature Oct. 1, 2013 6 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U Typical Characteristics V = 3.3V, GND = 0V, V = 100mV, R = 50Ω to V -2V, T = 25°C, unless otherwise stated. CC IN L CC A Oct. 1, 2013 7 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U Functional Characteristics V = 3.3V, GND = 0V, V = 400mV, Data Pattern: 223-1, R = 50Ω to V -2V, T = 25°C, unless otherwise stated. CC IN L CC A Oct. 1, 2013 8 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U Functional Characteristics (continued) V = 3.3V, GND = 0V, V = 400mV, R = 50Ω to V -2V, T = 25°C, unless otherwise stated. CC IN L CC A Oct. 1, 2013 9 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U Input and Output Stage Single-Ended and Differential Swings Figure 3a. Single-Ended Voltage Swing Figure 2a. Simplified Differential Input Buffer Figure 3b. Differential Voltage Swing Figure 2b. Simplified LVPECL Output Buffer Oct. 1, 2013 10 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U Input Interface Applications Figure 4a. CML Interface Figure 4b. CML Interface Figure 4c. LVPECL Interface (DC-Coupled) (AC-Coupled) (DC-Coupled) Option: May connect VT to VCC Figure 4d. LVPECL Interface Figure 4e. LVDS Interface (AC-Coupled) Oct. 1, 2013 11 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U LVPECL Output Termination LVPECL outputs have very low output impedance (open emitter), and small signal swing which results in low EMI. LVECL is ideal for driving 50Ω-and-100Ω- controlled impedance transmission lines. There are several techniques in terminating the LVPECL output, as shown in Figures 5a through 5c. R1 Figure 5b. Three-Resistor “Y-Termination” Figure 5a. Parallel Termination-Thevenin Equivalent Related Product and Support Documents Part Number Function Data Sheet Link SY58606U 4.25Gbps Precision, 1:2 CML Fanout Buffer with http://www.micrel.com/page.do?page=/product- Internal Termination and Fail Safe Input info/products/sy58606u.shtml SY58608U 3.2Gbps Precision, 1:2 LVDS Fanout Buffer Buffer http://www.micrel.com/page.do?page=/product- with Internal Termination and Fail Safe Input info/products/sy58608u.shtml HBW Solutions New Products and Termination Application Notes http://www.micrel.com/page.do?page=/product- info/as/HBWsolutions.shtml Oct. 1, 2013 12 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SY58607U Package Information 16-Pin QFN 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2006 Micrel, Incorporated. Oct. 1, 2013 13 M9999-082907-B hbwhelp@micrel.com or (408) 955-1690

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: SY58607UMG SY58607UMG-TR