SY56023R Low Voltage 1.2V/1.8V/2.5V CML 2x2 Crosspoint Switch 6.4Gbps with Equalization General Description The SY56023R is a fully-differential, low-voltage 1.2V/1.8V/2.5V CML 2x2 crosspoint switch with input equalization. The SY56023R can process clock signals as fast as 5GHz or data patterns up to 6.4Gbps. The differential input includes Micrel’s unique, 3-pin input termination architecture that interfaces to CML differential signals, without any level-shifting or termination resistor networks in the signal path. The differential input can also accept AC-coupled LVPECL and LVDS signals. Input voltages as small as 200mV (400mVPP) are applied before the 9”, 18” or 27” FR4 transmission line. For ACcoupled input interface applications, an internal voltage reference is provided to bias the VT pin. The outputs are CML, with extremely fast rise/fall times guaranteed to be less than 80ps. The SY56023R operates from a 2.5V ±5% core supply and a 1.2V, 1.8V or 2.5V ±5% output supply and is guaranteed over the full industrial temperature range (–40°C to +85°C). The SY56023R is part of Micrel’s highspeed, Precision Edge® product line. Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Functional Block Diagram Precision Edge® Features 1.2V/1.8V/2.5V CML 2x2 Crosspoint Switch Equalizes 9, 18, 27 inches of FR4 Guaranteed AC performance over temperature and voltage: – DC-to > 6.4Gbps Data throughput – DC-to > 5GHz Clock throughput – <280 ps propagation delay (IN-to-Q) – <15 ps output skew – <80 ps rise/fall times Ultra-low jitter design – <1 psRMS cycle-to-cycle jitter High-speed CML outputs 2.5V ±5% VCC , 1.2/1.8V/2.5V ±5% VCCO power supply operation Industrial temperature range: –40°C to +85°C Available in 16-pin (3mm x 3mm) QFN package Applications Data Distribution: SONET clock and data distribution Fiber Channel clock and data distribution Gigabit Ethernet clock and data distribution Markets Storage ATE Test and measurement Enterprise networking equipment High-end servers 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 January 2012 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish SY56023RMG QFN-16 Industrial R023 with Pb-Free Bar-Line Indicator NiPdAu Pb-Free SY56023RMGTR(2) QFN-16 Industrial R023 with Pb-Free Bar-Line Indicator NiPdAu 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 Truth Table SEL0 SEL1 Q0 Q1 L L IN0 IN0 L H IN0 IN1 H L IN1 IN0 H H IN1 IN1 EQ EQUALIZATION LOW 27 “ FLOAT 18” HIGH 9” January 2012 2 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R Pin Description Pin Number Pin Name Pin Function 16,1 IN0, /IN0 4,5 IN1, /IN1 Differential Inputs: Signals as small as 200mV VPK (400mVPP) applied to the input of 9, 18 or 27 inches 6 mil FR4 stripline transmission line are then terminated with the differential input. Each input pin internally terminates with 50Ω to the VT pin. 2 VT0 3 VT1 13 EQ 15 SEL0 6 SEL1 7 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the VCC pins as possible. Supplies input and core circuitry. 8 VCCO Output Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the VCCO pins as possible. Supplies the output buffers 14 GND, Exposed Pad 12,11 Q0, /Q0 10,9 Q1, /Q1 January 2012 Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. This pin provides a center-tap to a termination network for maximum interface flexibility. An internal high impedance resistor divider biases VT to allow input AC coupling. For AC-coupling, bypass VT with 0.1µF low_ESR capacitor to VCC. See “Interface Applications” subsection and Figure 2a. Three level input for equalization control. High, float, low. EQ pin applies the same EQ setting to both inputs. These single-ended TTL/CMOS-compatible inputs, selects inputs IN0 or IN1. Note that these inputs are internally connected to a 25kΩ pull-up resistor and will default to a logic HIGH state if left open. Ground: Exposed pad must be connected to a ground plane that is the same potential as the ground pins. CML Differential Output Pairs: Differential buffered copy of the input signal. The output swing is typically 390mV. See “Interface Applications” subsection for termination information. 3 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC) ............................... –0.5V to +3.0V Supply Voltage (VCCO) ............................. –0.5V to +3.0V VCC - VCCO ...............................................................<1.8V VCCO - VCC ...............................................................<0.5V Input Voltage (VIN) .......................................–0.5V to VCC CML Output Voltage (VOUT) ......................... 0.6V to 3.0V Current (VT) Source or sink on VT pin .............................±100mA Input Current Source or sink Current on (IN, /IN) ................±50mA Maximum operating Junction Temperature .......... 125°C Lead Temperature (soldering, 20sec.) .................. 260°C Storage Temperature (Ts) ....................–65°C to +150°C Supply Voltage (VCC)..........................2.375V to 2.625V (VCCO) ..........................1.14V to 2.625V Ambient Temperature (TA) ................... –40°C to +85°C Package Thermal Resistance(3) QFN Still-air (JA) ............................................ 75°C/W Junction-to-board (JB) ......................... 33°C/W DC Electrical Characteristics(4) TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min Typ Max Units VCC Power Supply Voltage Range VCC 2.375 2.5 2.625 V VCCO 1.14 1.2 1.26 V VCCO 1.7 1.8 1.9 V VCCO 2.375 2.5 2.625 V ICC Power Supply Current Max. VCC 80 110 mA ICCO Power Supply Current No Load. VCCO 32 42 mA RIN Input Resistance (IN-to-VT, /IN-to-VT ) 45 50 55 Ω RDIFF_IN Differential Input Resistance (IN-to-/IN) 90 100 110 Ω VIH Input HIGH Voltage (IN, /IN) IN, /IN 1.42 VCC V VIL Input LOW Voltage (IN, /IN) IN, /IN 1.22V = 1.7-0.475 1.22 VIH–0.2 V VIN Input Voltage Swing (IN, /IN) see Figure 3a, Note 5, applied to input of transmission line. 0.2 1.0 V VDIFF_IN Differential Input Voltage Swing (|IN - /IN|) see Figure 3b, Note 5, applied to input of transmission line. 0.4 2.0 V VT_IN Voltage from Input 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. JB and JA values are determined for a 4-layer board in still-air number, unless otherwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 5. VIN(max) is specified when VT is floating. January 2012 4 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R CML Outputs DC Electrical Characteristics(6) VCCO = 1.14V to 1.26V RL = 50Ω to VCCO, VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50Ω to VCCO or 100Ω across the outputs, VCC = 2.375V to 2.625V; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition VOH Output HIGH Voltage RL = 50Ω to VCCO VOUT Output Voltage Swing See Figure 3a VDIFF_OUT Differential Output Voltage Swing See Figure 3b ROUT Output Source Impedance Min Typ Max Units VCC-0.020 VCC-0.010 VCC V 300 390 475 mV 600 780 950 mV 45 50 55 Ω Min Typ Max Units VCC V 0.8 V 30 µA LVTTL/CMOS DC Input Electrical Characteristics(6) VCC = 2.375V to 2.625V; 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 µA Three Level EQ Input DC Electrical Characteristics(6) VCC = 2.375V to 2.625V; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min Typ Max VIH Input HIGH Voltage VCC-0.3 VCC V VIL Input LOW Voltage 0 VEE+0.3 V IIH Input HIGH Current VIH = VCC 400 µA IIL Input LOW Current VIL = GND -480 Units µA Note: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. January 2012 5 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R AC Electrical Characteristics VCCO = 1.14V to 1.26V RL = 50Ω to VCCO, VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50Ω to VCCO or 100Ω across the outputs, VCC = 2.375V to 2.625V; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition fMAX Maximum Frequency NRZ Data Min VOUT = 100mV tPD Propagation Delay IN-to-Q SEL-to-Q tSkew tJitter tR tF Input-to-Input Skew Clock Typ Max Units 6.4 Gbps 5 GHz Note 7, Figure 1 100 180 280 ps Figure 1 90 210 350 ps Note 8 5 20 ps 3 Output-to-Output Skew Note 9 15 ps Part-to-Part Skew Note 10 100 ps Random Jitter Note 11 1 psRMS Crosstalk Induced Jitter (Adjacent Channel) Note 12 0.7 psPP Output Rise/Fall Time (20% to 80%) At full output swing. 80 ps 20 50 Notes: 7. Propagation delay is measured with no attenuating transmission line connected to the input. 8. Input-to-Input skew is the difference in time between both inputs and the output for the same temperature, voltage and transition. 9. Output-to-Output skew is the difference in time between both outputs under identical input transition, temperature and power supply 10. 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. 11. Random jitter is measured with a K28.7 pattern, measured at ≤ fMAX. 12. Crosstalk induced jitter is defined as the added jitter that results from signals applied to the adjacent channel. It is measured at the output while applying a similar, differential clock frequencies that are asynchronous with respect to each other at the adjacent input. January 2012 6 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R Interface Applications For Input Interface Applications see Figures 4a-e and for CML Output Termination see Figures 5a-d. CML Output Termination with VCCO 1.2V For VCCO of 1.2V, Figure 5a, terminate the output with 50 Ohms to 1.2V, not 100 ohms differentially across the outputs. If AC coupling is used, Figure 5d, terminate into 50 ohms to 1.2V before the coupling capacitor and then connect to a high value resistor to a reference voltage. Any unused output pair needs to be terminated, do not leave floating. CML Output Termination with VCCO 1.8V For VCCO of 1.8V, Figure 5a and Figure 5b, terminate with either 50 ohms to 1.8V or 100 ohms differentially across the outputs. AC- or DC-coupling is fine. Input Termination 1.8V CML driver: Terminate input with VT tied to 1.8V. Don’t terminate 100 ohms differentially. 2.5V CML driver: Terminate input with either VT tied to 2.5V or 100 ohms differentially. The input cannot be DC coupled from a 1.2V CML driver. Timing Diagrams Figure 1. Propagation Delay January 2012 7 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R Typical Characteristics VCC = 2.5, VCCO = 1.2V, GND = 0V, VIN = 400mV, RL = 50Ω to 1.2V, Data Pattern: 223-1, TA = 25°C, unless otherwise stated. January 2012 8 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R Input and Output Stage Figure 2b. Simplified CML Output Buffer Figure 2a. Simplified Differential Input Buffer Single-Ended and Differential Swings Figure 3a. Single-Ended Swing January 2012 Figure 3b. Differential Swing 9 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R Input Interface Applications Figure 4a. CML Interface Figure 4b. CML Interface 100Ω Differential (DC-Coupled, 2.5V) 50Ω to VCC (DC-Coupled, 1.8V, 2.5V) Figure 4d. LVPECL Interface (AC-Coupled) Figure 4e. LVDS Interface (AC-Coupled) January 2012 10 Figure 4c. CML Interface (AC-Coupled) M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R CML Output Termination Figure 5a. 1.2V or 1.8V CML DC-Coupled Termination Figure 5b. 1.8V CML DC-Coupled Termination Figure 5c. CML AC-Coupled Termination VCCO 1.8V Only Figure 5d. CML AC-Coupled Termination VCCO 1.2V Only Related Product and Support Documents Part Number Function Datasheet Link HBW Solutions New Products and Termination Application Notes http://www.micrel.com/page.do?page=/productinfo/as/HBWsolutions.shtml January 2012 11 M9999-011112-B [email protected] or (408) 955-1690 Micrel, Inc. SY56023R 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 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. © 2012 Micrel, Incorporated. January 2012 12 M9999-011112-B [email protected] or (408) 955-1690