Precision Edge® SY58028U ® ULTRA PRECISION DIFFERENTIAL CML 4:1 MUX WITH 1:2 FANOUT AND INTERNAL I/O TERMINATION Micrel, Inc. Precision Edge SY58028U FEATURES ■ Selects 1 of 4 differential inputs ■ Provides two copies of the selected input ■ Guaranteed AC performance over temperature and voltage: • DC-to- > 10.7Gbps data rate throughput • < 350ps IN-to-Out tpd • < 60ps tr / tf times ■ Ultra low-jitter design: • < 10psPP total jitter (clock) • < 1psRMS random jitter • < 10psPP deterministic jitter • < 0.7psRMS crosstalk-induced jitter ■ Unique patended input design minimizes crosstalk ■ Accepts an input signal as low as 100mV ■ Unique patended input termination and VT pin accepts DC- and AC-coupled inputs (CML, LVPECL, LVDS) ■ Internal 50Ω output source termination ■ 400mV CML output swing (RL = 50Ω) ■ Power supply 2.5V ±5% or 3.3V ±10% ■ –40°C to +85°C temperature range ■ Available in 32-pin (5mm × 5mm) MLF® package Precision Edge® DESCRIPTION The SY58028U is a 2.5V/3.3V precision, high-speed, 4:1 differential CML multiplexer capable of handling clocks up to 7GHz and data streams up to 10.7Gbps. In addition, a 1:2 fanout buffer provides two copies of the selected inputs. The differential input includes Micrel’s unique, 3-pin input termination architecture that allows customers to interface 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 result is a clean, stub-free, low-jitter interface solution. The outputs are 50Ω source terminated CML, with extremely fast rise/fall times guaranteed to be less than 60ps. The SY58028U operates from a 2.5V ±5% supply or a 3.3V ±10% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. For applications that require LVPECL outputs, consider the SY58029U or SY58030U Multiplexers. The SY58028U is part of Micrel’s high-speed, Precision Edge® product line. All support documentation can be found on Micrel’s web site at www.micrel.com. FUNCTIONAL BLOCK DIAGRAM APPLICATIONS ■ ■ ■ ■ ■ IN0 Redundant clock and/or data distribution All SONET/SDH clock/data distribution Loopback All Fibre Channel distribution All Gigabit Ethernet clock and/or data distribution 50Ω VT0 50Ω 4:1 MUX /IN0 VREF-AC0 1:2 Fanout 0 IN1 50Ω VT1 50Ω TYPICAL PERFORMANCE Q0 /Q0 1 /IN1 VREF-AC1 MUX 2 IN2 Q1 Output Swing (100mV/div.) 50Ω /Q1 VT2 50Ω /IN2 3 VREF-AC2 IN3 50Ω VT3 50Ω /IN3 TIME (100ps/div.) VREF-AC3 Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-082707 [email protected] or (408) 955-1690 SEL0 (CMOS/TTL) SEL1 (CMOS/TTL) Rev.: D 1 Amendment: /0 Issue Date: August 2007 Precision Edge® SY58028U Micrel, Inc. PACKAGE/ORDERING INFORMATION /IN3 VREF-AC3 VT3 IN3 /IN2 VREF-AC2 VT2 IN2 Ordering Information(1) 32 31 30 29 28 27 26 25 IN0 VT0 VREF-AC0 /IN0 IN1 VT1 VREF-AC1 /IN1 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 GND VCC Q1 /Q1 VCC NC SEL1 VCC 9 10 11 12 13 14 15 16 Part Number Package Type Operating Range Package Marking Lead Finish SY58028UMI MLF-32 Industrial SY58028U Sn-Pb SY58028UMITR(2) MLF-32 Industrial SY58028U Sn-Pb SY58028UMG(3) MLF-32 Industrial SY58028U with Pb-Free bar-line indicator Pb-Free NiPdAu SY58028UMGTR(2, 3) MLF-32 Industrial SY58028Uwith Pb-Free bar-line indicator Pb-Free NiPdAu GND VCC /Q0 Q0 VCC NC SEL0 VCC 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 recommended for new designs. 32-Pin MLF® (MLF-32) PIN DESCRIPTION Pin Number Pin Name Pin Function 1, 4 5, 8 25, 28 29, 32 IN0, /IN0 IN1, /IN1 IN2, /IN2 IN3, /IN3 Differential Inputs: These inputs accept AC- or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates to a VT pin through 50Ω. Note that these inputs will default to an indeterminate state if left open. If an input pair is not used, connect one input of the pair to ground through a 1kΩ resistor and the complement to VCC through a 825Ω resistor. Unused VT and VREF-AC may also be left open. Please refer to the “Input Interface Applications” section for more details. 2, 6, 26, 30 VT0, VT1 VT2, VT3 Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT pin provides a center-tap to the termination network for maximum interface flexibility. See “Input Interface Applications” section for more details. 15, 18 SEL0, SEL1 This single-ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note that this input is internally connected to a 25kΩ pull-up resistor and will default to a logic HIGH state if left open. Input logic threshold is VCC/2. See “Truth Table” for select control. 14, 19 NC 10, 13, 16 17, 20, 23 VCC No Connect. 11, 12 21, 22 /Q0, Q0 /Q1, Q1 9, 24 GND, Exposed Pad 3, 7, 27, 31 VREF-AC0 VREF-AC1 VREF-AC2 VREF-AC3 Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors. Differential Outputs: These CML output pairs are copies of the selected input. Unused output pairs may be left floating. See “Output Interface” section for termination guidelines. Ground. Ground pin and exposed pad must be connected to the same ground plane. Reference Voltage: This reference output is equivalent to VCC–1.4V. It is used for AC-coupled inputs. When interfacing to AC input signals, connect VREF-AC directly to the VT pin and bypass with 0.01µF low ESR capacitor to VCC. See “Input Interface Applications” section. Maximum sink/source current is 0.5mA. TRUTH TABLE SEL1 SEL0 0 0 IN0 Input Selected 0 1 IN1 Input Selected 1 0 IN2 Input Selected 1 1 IN3 Input Selected M9999-082707 [email protected] or (408) 955-1690 2 Precision Edge® SY58028U Micrel, Inc. Absolute Maximum Ratings(1) Operating Ratings(2) Power Supply Voltage (VCC ) ...................... –0.5V to +4.0V Input Voltage (VIN) ......................................... –0.5V to VCC CML Output Voltage (VOUT) ........... VCC–1.0V to VCC+0.5V Termination Current(3) Source or sink current on VT pin ........................ ±100mA Input Current Source or sink current on IN, /IN pin .................... ±50mA Lead Temperature (soldering, 20 sec.) ..................... 260°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) MLF® (θJA) Still-Air ............................................................. 35°C/W MLF® (ψJB) Junction-to-Board .............................................. 2°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 VCC = 3.3V 2.375 3.0 2.5 3.3 2.625 3.6 V V ICC Power Supply Current No load, max. VCC 120 150 mA RDIFF_IN Differential Input Resistance (IN-to-/IN) 80 100 120 Ω RIN Input Resistance (IN-to-VT, /IN-to-VT) 40 50 60 Ω 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 Max Input Voltage (IN-to-VT) VREF-AC 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 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. M9999-082707 [email protected] or (408) 955-1690 3 Precision Edge® SY58028U Micrel, Inc. CML OUTPUT DC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; TA= -40°C to 85°C; RL = 100Ω across each output pair or equivalent; unless otherwise stated. Symbol Parameter Condition Min Typ VOH Output HIGH Voltage VOUT Output Voltage Swing See Figure 1a. 325 400 mV VDIFF_OUT Differential Output Voltage Swing See Figure 1b. 650 800 mV ROUT Output Source Impedance 40 50 60 Ω Typ Max Units VCC–0.020 Max Units VCC V 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 Min VIH Input HIGH Voltage SEL0, SEL1 2.0 VIL Input LOW Voltage SEL0, SEL1 IIH IIL V 0.8 V Input HIGH Current 40 µA Input LOW Current –300 µA Note: 7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. M9999-082707 [email protected] or (408) 955-1690 4 Precision Edge® SY58028U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(8) VCC = 2.5V ±5% or 3.3V ±10%; RL = 100Ω across each output pair, or equivalent; TA= –40°C to +85°C, VIN ≥ 100mV unless otherwise stated. Symbol Parameter Condition fMAX Maximum Operating Frequency Min NRZ Data VOUT ≥ 200mV tpd Propagation Delay (Diff) (IN to Q) tpd Tempco tSKEW tJITTER Output-to-Output GHz 340 ps 500 ps 115 Note 9 7 fs/°C 20 ps 50 ps Part-to-Part Note 10 Random Jitter Note 11 2.5Gbps to 3.2Gbps 1 psRMS Deterministic Jitter Note 12 2.5Gbps to 3.2Gbps 10 psPP Cycle-to-Cycle Jitter Note 13 1 psRMS Total Jitter Note 14 10 psPP Crosstalk Induced Jitter (Adjacent Channel) Note 15 0.7 psRMS Output Rise/Fall Time 20% to 80%, Full output swing 60 ps Data Clock tr, tf 260 100 Differential Propagation Delay Temperature Coefficient Units Gbps 7 170 (SEL to Q) Max 10.7 Clock VIN ≥ 100mV Typ 20 45 Notes: 8. High frequency AC electricals are guaranteed by design and characterization. 9. Output-to-output skew is measured between outputs under identical input conditions. 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. 11. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps to 3.2Gbps. 12. Deterministic jitter is measured at 2.5Gbps to 3.2Gbps, with both K28.5 and 223–1 PRBS pattern. 13. 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. 14. 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. 15. Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs. SINGLE-ENDED AND DIFFERENTIAL SWINGS VDIFF_IN, VDIFF_OUT 800mV (Typ.) VIN, VOUT 400mV (Typ.) Figure 1a. Single-Ended Voltage Swing M9999-082707 [email protected] or (408) 955-1690 Figure 1b. Differential Voltage Swing 5 Precision Edge® SY58028U Micrel, Inc. TIMING DIAGRAMS IN VIN /IN tpd tpd Q VOUT /Q Figure 2a. IN-to-Q Timing Diagram VCC/2 VCC/2 tpd tpd SEL Q VOUT /Q Figure 2b. SEL-to-Q Timing Diagram SEL0 Q: or: SEL1 = LOW; SEL1 = HIGH; IN0, /IN1 = LOW; IN2, /IN3 = LOW; /IN0, IN1 = HIGH /IN2, IN3 = HIGH or: SEL0 = LOW; SEL0 = HIGH; IN0, /IN2 = LOW; IN1, /IN3 = LOW; /IN0, IN2 = HIGH /IN1, IN3 = HIGH SEL1 Q: M9999-082707 [email protected] or (408) 955-1690 6 Precision Edge® SY58028U Micrel, Inc. FUNCTIONAL CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. 200MHz Output Output Swing (100mV/div.) Output Swing (100mV/div.) 2GHz Output TIME (70ps/div.) TIME (600ps/div.) 7Gbps Output (223–1 PRBS) Output Swing (100mV/div.) Output Swing (100mV/div.) TIME (100ps/div.) TIME (50ps/div.) Output Swing (100mV/div.) 10.7Gbps Output (223–1 PRBS) TIME (25ps/div.) M9999-082707 [email protected] or (408) 955-1690 7 Precision Edge® SY58028U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated. ∆ OUTPUT-to-OUTPUT SKEW (ps) PROPAGATION DELAY (ps) 240 Propagation Delay vs. Input Voltage Swing 238 236 234 232 230 228 226 0 200 400 600 800 1000 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40 60 Output Amplitude vs. Frequency OUTPUT AMPLITUDE (mV) PROPAGATION DELAY (ps) Propagation Delay vs. Temperature 20 40 60 80 100 80 100 500 450 400 350 300 250 200 150 100 50 0 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (GHz) TEMPERATURE (°C) M9999-082707 [email protected] or (408) 955-1690 1 TEMPERATURE (°C) INPUT VOLTAGE SWING (mV) 248 246 244 242 240 238 236 234 232 230 228 -60 -40 -20 0 1.2 Output-to-Output Skew vs. Temperature 8 Precision Edge® SY58028U Micrel, Inc. INPUT STAGE VCC IN 50Ω VT GND 50Ω /IN Figure 3. Simplified Differential Input Stage INPUT INTERFACE APPLICATIONS VCC VCC VCC IN LVPECL IN CML SY58028U CML /IN /IN SY58028U GND /IN IN NC VREF-AC NC VT Figure 4a. DC-Coupled CML Interface GND SY58028U VCC VREF-AC Figure 4b. CML Interface (AC-Coupled) VCC LVPECL /IN Rpd IN SY58028U LVDS /IN GND VREF-AC SY58028U VT GND 0.01µF VCC For a 3.3V system, Rpd = 100Ω For a 2.5V system, Rpd = 50Ω Figure 4d. AC-Coupled LVPECL Interface M9999-082707 [email protected] or (408) 955-1690 NC VREF-AC NC VT Figure 4f. LVDS Interface 9 Rpd For a 3.3V system, Rpd = 50Ω For a 2.5V system, Rpd = 19Ω VT VCC Rpd VREF-AC VT 0.01µF GND 0.01µF Option: May connect VT to VCC IN NC VCC Figure 4c. DC-Coupled PECL Interface Precision Edge® SY58028U Micrel, Inc. OUTPUT INTERFACE APPLICATIONS VCC VCC SY58028U SY58028U 50Ω 50Ω Q 50Ω ZO = 50Ω 50Ω Q ZO = 50Ω 50Ω 100Ω /Q /Q ZO = 50Ω 50Ω ZO = 50Ω DC bias per application 16mA 16mA GND GND Figure 5a. CML DC-Coupled (100Ω Termination) Figure 5b. CML AC-Coupled (50Ω Termination) RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION Part Number Function Data Sheet Link SY58028U Ultra Precision Differential CML 4:1 MUX with 1:2 Fanout and Internal I/O Termination http://www.micrel.com/product-info/products/sy58028u.shtml SY58029U Ultra Precision Differential LVPECL 4:1 MUX with 1:2 Fanout and Internal Termination http://www.micrel.com/product-info/products/sy58029u.shtml SY58030U Ultra Precision, 400mV Differential LVPECL 4:1 MUX with 1:2 Fanout and Internal Termination http://www.micrel.com/product-info/products/sy58030u.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 M9999-082707 [email protected] or (408) 955-1690 10 Precision Edge® SY58028U Micrel, Inc. 32-PINMicroLeadFrame® (MLF-32) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane PCB Thermal Consideration for 32-Pin MLF® Package (Always solder, or equivalent, the exposed pad to the PCB) Package Notes: 1. Package meets Level 2 qualification. 2. All parts 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) 474-100 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. M9999-082707 [email protected] or (408) 955-1690 11