Micrel ULTRA PRECISION 8:1 MUX WITH INTERNAL TERMINATION AND 1:2 LVPECL FANOUT BUFFER Precision Edge™ SY58038U Precision Edge™ SY58038U FEATURES - Selects between 1 of 8 inputs, and provides 2 precision, low skew LVPECL output copies - Ultra-low jitter design: • 72fsrms phase jitter (typ) - Guaranteed AC performance over temperature and voltage: • DC to 4.5Gbps throughput • <500ps propagation delay IN-to-Q (VIN > 100mV) • <100ps tr / tf time • <15ps skew (output-to-output) - Unique, patent-pending, channel-to-channel isolation design provides superior crosstalk performance - Unique, patent-pending, input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS) - 800mV LVPECL output swing - Power supply 2.5V ±5% or 3.3V ±10% - –40°C to +85°C temperature range - Available in 44-pin (7mm ∗ 7mm) QFN package Precision Edge™ DESCRIPTION The SY58038U is a low jitter, low skew, high-speed 8:1 multiplexer with a 1:2 differential fanout buffer optimized for precision telecom and enterprise server distribution applications. The SY58038U distributes clock frequencies from DC to 3.5GHz, and data rates to 4.5Gpbs guaranteed over temperature and voltage. The SY58038U differential input includes Micrel’s unique, 3-pin input termination architecture that directly interfaces to any differential signal (AC- or DC-coupled) as small as 100mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100K compatible LVPECL with extremely fast rise/fall times guaranteed to be less than 100ps. The SY58038U features a patent-pending isolation design that significantly improves channel-to-channel crosstalk performance. The SY58038U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY58038U is part of Micrel’s high-speed, Precision Edge™ product line. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. APPLICATIONS - Data communication systems All SONET/SDH data/clock applications All Fibre Channel applications All Gigabit Ethernet applications Precision Edge is a trademark of Micrel, Inc. M9999-110311 [email protected] or (408) 955-1690 Rev.: B 1 Amendment: /0 Issue Date: November 2011 Precision Edge™ SY58038U Micrel FUNCTIONAL BLOCK DIAGRAM IN0 50Ω VT0 50Ω /IN0 VREF-AC0 IN1 50Ω VT1 50Ω /IN1 IN2 50Ω 8:1 MUX VT2 50Ω 0 /IN2 VREF-AC1 IN3 1 50Ω 50Ω Q0 3 /IN3 /Q0 4 MUX IN4 50Ω 5 50Ω 6 VT4 /IN4 VREF-AC2 IN5 Q1 /Q1 7 S2 S1 S0 50Ω VT5 50Ω /IN5 IN6 50Ω VT6 50Ω /IN6 VREF-AC3 IN7 50Ω VT7 50Ω /IN7 SEL0 (CMOS/TTL) SEL1 (CMOS/TTL) SEL3 (CMOS/TTL) TRUTH TABLE SEL2 SEL1 SEL0 Q /Q L L L IN0 /IN0 L L H IN1 /IN1 L H L IN2 /IN2 L H H IN3 /IN3 H L L IN4 /IN4 H L H IN5 /IN5 H H L IN6 /IN6 H H H IN7 /IN7 M9999-110311 [email protected] or (408) 955-1690 1:2 Fanout 2 VT3 2 Precision Edge™ SY58038U Micrel PACKAGE/ORDERING INFORMATION VT5 /IN5 IN6 VT6 /IN6 VREF-AC3 IN7 VT7 /IN7 SEL2 NC Ordering Information(1) 44 43 42 41 40 39 38 37 36 35 34 1 33 2 32 3 31 4 30 5 29 6 28 7 27 8 26 9 25 24 10 23 11 12 13 14 15 16 17 18 19 20 21 22 SY58038UMI GND VCC /Q1 Q1 VCC GND VCC /Q0 Q0 VCC GND SY58038UMITR(2) Package Type Operating Range Package Marking QFN-44 Pb-Free Industrial SY58038U QFN-44 Industrial SY58038U Pb-Free Notes: 1. Contact factory for die availability. Die are guaranteed at TA = 25°C, DC electricals only. All devices are Pb-Free. 2. Tape and Reel. VT2 IN2 /IN1 VT1 IN1 VREF-AC0 /IN0 VT0 IN0 SEL0 SEL1 IN5 VREF-AC2 /IN4 VT4 IN4 NC /IN3 VT3 IN3 VREF-AC1 /IN2 Part Number 44-Pin QFN (QFN-44) PIN DESCRIPTION Pin Number Pin Name Pin Function 20, 18, 16, 14, 13, 11, 9, 7, 5, 3, 1, 43, 42, 40, 38, 36 IN0, /IN0, IN1, /IN1, IN2, /IN2, IN3, /IN3, IN4, /IN4, IN5,/IN5, IN6, /IN6, IN7, /IN7 Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs accept AC or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates to a VT pin through 50ohms. Note that these inputs will default to an indeterminate state if left open.Please refer to the “Input Interface Applications” section for more details. 19,15, 12, 8, 4, 44, 41, 37 VT0, VT1 VT2, VT3, VT4, VT5, VT6, VT7 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 details. For a CML or LVDS inputs, the VT pin is left floating. 17, 10, 2 39 VREF-AC0, VREF-AC1, VREF-AC2, VREF-AC3 Reference Voltage: This output biases to VCC–1.2V. It is used when AC coupling the inputs (IN, /IN). For AC-coupled applications, connect VREF_AC to the VT pin and bypass with a 0.01μF low ESR capacitor to VCC. See “Input Interface Applications” section for more details. 21, 22, 35 SEL0, SEL1, SEL2 The single-ended TTL/CMOS-compatible inputs select the inputs to the multiplexer. Note that this input is internally connected to a 25kohms pull-up resistor and will default to a logic HIGH state if left open. 24, 27, 29, 32 VCC Positive Power Supply. Bypass with 0.1μF//0.01μF low ESR capacitors as close to each VCC pin. 25, 26, 30, 31 Q0,/Q0, Q1,/Q1 Differential Outputs: These LVPECL output pairs are the outputs of the device. Unused output pairs may be left open. Each output is designed to drive 800mV into 50ohms terminated to VCC–2V.(or VCC–1.2V if AC-coupled). 23, 28, 33 GND, Exposed Pad Ground. GND and exposed pad must both be connected to the most negative potential of chip ground. 3 Precision Edge™ SY58038U Micrel Absolute Maximum Ratings(1) Operating Ratings(2) Power Supply Voltage (VCC ) ....................... –0.5V to +4.0V Input Voltage (VIN) .......................................... –0.5V to VCC LVPECL Output Current (IOUT) Continuous ............................................................ 50mA Surge ................................................................... 100mA Termination Current(3) Source or sink current on VT pin ....................... ±100mA Lead Temperature (soldering, 10 sec.) .................... 265°C Storage Temperature Range (TS ) .......... –65°C to +150°C Power Supply Voltage (VCC) ................ +2.375V to +2.625V ............................................................ +3.0V to +3.6V Ambient Temperature Range (TA) .............. –40°C to +85°C Package Thermal Resistance(4) QFN (θJA) Still-Air ............................................................ 24°C/W QFN (ψJB) Junction-to-board ............................................ 12°C/W DC ELECTRICAL CHARACTERISTICS(5) TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min Typ Max Units VCC Power Supply Voltage VCC = 2.5V. 2.375 2.5 2.625 V VCC = 3.3V. 3.0 3.3 3.6 V 120 170 mA ICC Power Supply Current No load, max. VCC. RIN Input Resistance (IN-to-VT) 40 50 60 ohms RDIFF_IN Differential Input Resistance (IN-to-/IN) 80 100 120 ohms VIH Input HIGH Voltage (IN-to-/IN) VCC–1.6 VCC V VIL Input LOW Voltage (IN-to-/IN) 0 VIH–0.1 V VIN Input Voltage Swing (IN-to-/IN) See Figure 1a. 0.1 1.7 V VDIFF_IN Differential Input Voltage Swing (IN-to-/IN) See Figure 1b. 0.2 VT_IN IN-to-VT (IN-to-/IN) VREF-AC Output Reference Voltage Note 6 V 1.28 VCC–1.3 VCC–1.2 VCC–1.1 V V Notes: 1. Permanent device damage may occur if ratings in the “Absolute Maximum Ratings” section are exceeded. This is a stress rating only and functional operation is not implied for 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. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential 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. 4 Precision Edge™ SY58038U Micrel LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C; RL = 50ohms to VCC–2V, 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 VCC–1.945 VCC–1.695 V VOUT Output Differential Swing Q, /Q See Figure 1a. 550 800 mV VDIFF_OUT Differential Output Voltage Swing Q, /Q See Figure 1b. 1100 1600 mV Min Typ LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition VIH Input HIGH Voltage VIL Input LOW Voltage IIH Input HIGH Current –125 IIL Input LOW Current –300 2.0 Note: 7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 5 Max Units VCC V 0.8 V 30 μA μA Precision Edge™ SY58038U Micrel AC ELECTRICAL CHARACTERISTICS(8) VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C, RL = 50ohms to VCC–2V, unless otherwise stated. Symbol Parameter Condition fMAX Maximum Operating Frequency Min NRZ data 4.5 Clock 3.5 5 280 390 VOUT > 400mV Differential Propagation Delay (IN-to-Q) tpd VIN > 100mV (SEL-to-Q) Δtpd Tempco Max GHz 500 ps 600 ps 220 Output-to-Output Skew Part-to-Part Skew Units Gbps 150 Differential Propagation Delay Temperature Coefficient tSKEW Typ fs/°C Note 9 15 ps Note 10 150 ps tJITTER RMS Phase Jitter Output = 622MHz Integration Range: 12kHz - 20MHz tr, tf Output Rise/Fall Time At full output swing, 20% to 80%. 72 35 65 fsrms 100 Notes: 8. High-frequency AC-parameters are guaranteed by design and characterization. 9. Output-to-output skew is measured between two different outputs under identical input transitions. 10. 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. PHASE NOISE Noise Power (dBc/Hz) RMS PHase Jitter (Random) 12kHz to 20MHz = 72fs (Typical) OFFSET FREQUENCY (Hz) Phase Noise Plot: 622MHz @ 3.3V 6 ps Precision Edge™ SY58038U Micrel SINGLE-ENDED AND DIFFERENTIAL SWINGS VDIFF_IN, VDIFF_OUT 1600mV (Typ.) VIN, VOUT 800mV (Typ.) Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing 7 Precision Edge™ SY58038U Micrel TYPICAL OPERATING CHARACTERISTICS VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 700 600 500 400 1000 2000 3000 4000 5000 FREQUENCY (MHz) Within Device Skew vs. Temperature 365 PROPAGATION DELAY (ps) 800 300 0 1.2 WITHIN DEVICE SKEW (ps) OUTPUT AMPLITUDE (mV) 900 Output Amplitude vs. Frequency 1.0 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 8 Propagation Delay vs. Temperature 360 355 350 345 340 335 330 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) Precision Edge™ SY58038U Micrel FUNCTIONAL CHARACTERISTICS VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 1.25Gbps Output (Q – /Q) Output Swing (400mV/div.) Output Swing (400mV/div.) 2.5Gbps Output (Q – /Q) TIME (100ps/div.) 3.2Gbps Output (Q – /Q) 200MHz Output (Q – /Q) Output Swing (400mV/div.) Output Swing (400mV/div.) TIME (200ps/div.) TIME (600ps/div.) 1.25GHz Output (Q – /Q) 2.5GHz Output (Q – /Q) Output Swing (400mV/div.) Output Swing (400mV/div.) TIME (75ps/div.) TIME (50ps/div.) TIME (100ps/div.) 9 Precision Edge™ SY58038U Micrel FUNCTIONAL CHARACTERISTICS (CONTINUED) VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. Output Swing (400mV/div.) 5GHz Output (Q – /Q) TIME (30ps/div.) 10 Precision Edge™ SY58038U Micrel INPUT AND OUTPUT STAGES VCC VCC IN 50Ω VT 50Ω GND /Q /IN Q Figure 2a. Simplified Differential Input Stage Figure 2b. Simplified LVPECL Output Stage INPUT INTERFACE APPLICATIONS VCC VCC VCC IN IN LVPECL VCC GND LVPECL /IN IN /IN SY58038U 0.01μF V T NC Rpd VCC GND VT VREF-AC GND For VCC = 3.3V, Rpd = 50Ω. For VCC = 2.5V, Rpd = 19Ω. Figure 3a. LVPECL Interface (DC-Coupled) 0.01μF For 3.3V, Rpd = 100Ω. For 2.5V, Rpd = 50Ω. Figure 3b. LVPECL Interface (AC-Coupled) VCC VCC IN CML IN /IN SY58038U GND VCC LVDS /IN SY58038U VT VREF-AC 0.01μF Figure 3d. CML Interface (AC-Coupled) GND /IN SY58038U Rpd VREF-AC Rpd CML NC VT NC VREF-AC Figure 3e. LVDS Interface 11 SY58038U GND NC VT NC VREF-AC Option: May connect VT to VCC. Figure 3c. CML Interface (DC-Coupled) Precision Edge™ SY58038U Micrel OUTPUT INTERFACE APPLICATIONS +3.3V +3.3V ZO = 50Ω R1 130Ω +3.3V R1 130Ω +3.3V +3.3V Zo = 50Ω Zo = 50Ω ZO = 50Ω VCC R2 82Ω R2 82Ω 50Ω C1 0.01μF (optional) Figure 4a. Parallel Thevenin-Equivalent Termination 50Ω Rb Figure 4b. Parallel Termination (3-Resistor) Note: Note: For +2.5V system, R1 = 250ý, R2 = 62.5ohms. For +2.5V system, Rb =19ohms. For +3.3V system, Rb = 50ohms. RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION Part Number Function Data Sheet Link SY58037U Ultra Precision 8:1 MUX with Internal Termination and 1:2 CML Fanout Buffer http://www.micrel.com/product-info/products/sy58037u.shtml SY58038U Ultra Precision 8:1 MUX with Internal Termination and 1:2 LVPECL Fanout Buffer http://www.micrel.com/product-info/products/sy58038u.shtml SY58039U Ultra Precision 8:1 MUX with Internal Termination and 1:2 400mV LVPECL Fanout Buffer http://www.micrel.com/product-info/products/sy58039u.shtml MLF™ Application Note www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf New Products and Applications www.micrel.com/product-info/products/solutions.shtml HBW Solutions 12 Precision Edge™ SY58038U Micrel 44 LEAD QFN\ (QFN 44) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation Heavy Copper Plane Heavy Copper Plane VEE VEE PCB Thermal Consideration for 44-Pin QFN Package (Always solder, or equivalent, the exposed pad to the PCB) Package Notes: 1. Package meets Level 2 qualification. 2. All parts are dry-packaged before shipment. 3. 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. © 2005 Micrel, Incorporated. 13