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SY56020R
Low Voltage 1.2V/1.8V/2.5V CML 1:4 Fanout Buffer 6.4Gbps with Equalization
General Description
The SY56020R is a fully differential, low voltage 1.2V/1.8V/2.5V CML 1:4 Fanout Buffer with input equalization. The SY56020R can process clock signals as fast as 4.5GHz 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 AC-coupled 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 90ps. The SY56020R 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 (- 40C to +85C). The SY56020R is part of Micrel's highspeed, Precision Edge(R) product line. Datasheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Precision Edge(R)
Features
* 1.2V/1.8V/2.5V CML 1:4 Fanout Buffer * Equalizes 9, 18, 27 inches of FR4 * Guaranteed AC performance over temperature and voltage: - DC-to > 6.4Gbps Data throughput - DC-to > 4.5GHz Clock throughput - <280 ps propagation delay (IN-to-Q) - <15ps within-device skew - <90ps rise/fall times * Ultra-low jitter design - <1psRMS random jitter * High-speed CML outputs * 2.5V 5% VCC , 1.2/1.8V/2.5V 5% VCCO power supply operation * Industrial temperature range: -40C to +85C * Available in 16-pin (3mm x 3mm) MLF(R) package
Functional Block Diagram
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. MLF and MicroLeadFrame are registered trademarks of Amkor Technology. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
October 2008
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Micrel, Inc.
SY56020R
Ordering Information(1)
Part Number SY56020RMG SY56020RMGTR(2)
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel.
Package Type MLF-16 MLF-16
Operating Range Industrial Industrial
Package Marking R020 with Pb-Free bar-line indicator R020 with Pb-Free bar-line indicator
Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free
Pin Configuration
16-Pin MLF(R) (MLF-16)
Truth Table
EQ LOW FLOAT HIGH Equalization FR4 6mil Stripline 9" 18" 27"
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SY56020R
Pin Description
Pin Number 2,3 Pin Name IN, /IN Pin Function Differential Input: Signals as small as 200mV VPK (400mVPP) applied to the input of 9, 18 or 27 inches 6mil FR4 stripline transmission line are then terminated with this differential input. Each input pin internally terminates with 50 to the VT pin. Input Termination Center-Tap: Each side of the differential input pair terminates to 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 ACcoupling, bypass VT with 0.1F low ESR capacitor to VCC. See "Interface Applications" subsection and Figure 2a. Three level input for equalization control. High, float, low. Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitors as close to the VCC pins as possible. Supplies input and core circuitry. Output Supply: Bypass with 0.1F//0.01F low ESR capacitors as close to the VCCO pins as possible. Supplies the output buffers. 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.
1
VT
4 16 8,13 5 15,14 12,11 10,9 7,6
EQ VCC VCCO GND, Exposed pad Q0, /Q0 Q1, /Q1 Q2, /Q2 Q3, /Q3
October 2008
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Micrel, Inc.
SY56020R
Absolute Maximum Ratings(1)
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 .......... 125C Lead Temperature (soldering, 20sec.) .................. 260C Storage Temperature (Ts) ....................-65C to +150C
Operating Ratings(2)
Supply Voltage (Vcc)...........................2.375V to 2.625V (Vcco)........................1.14V to 2.625V Ambient Temperature (TA) ................... -40C to +85C Package Thermal Resistance(3) MLF(R) Still-air (JA) ............................................ 75C/W Junction-to-board (JB) ......................... 33C/W
DC Electrical Characteristics(4)
TA = -40C to +85C, unless otherwise stated.
Symbol VCC Parameter Power Supply Voltage Range Condition VCC VCCO VCCO VCCO Max. VCC No Load. Max VCCO 45 90 IN, /IN IN, /IN 1.22V = 1.7-0.475 See Figure 3a, applied to input of transmission line. See Figure 3b, applied to input of transmission line. 1.42 1.22 0.2 0.4 Min 2.375 1.14 1.7 2.375 Typ 2.5 1.2 1.8 2.5 60 64 50 100 Max 2.625 1.26 1.9 2.625 85 84 55 110 VCC VIH-0.2 1.0 2.0 1.28 Units V V V V mA mA V V V V V
ICC ICCO RIN RDIFF_IN VIH VIL VIN VDIFF_IN VT_IN
Notes:
Power Supply Current Power Supply Current Input Resistance (IN-to-VT, /IN-to-VT ) Differential Input Resistance (IN-to-/IN) Input HIGH Voltage (IN, /IN) Input LOW Voltage (IN, /IN) Input Voltage Swing (IN, /IN) Differential Input Voltage Swing (|IN - /IN|) Voltage from Input to VT
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.
October 2008
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Micrel, Inc.
SY56020R
CML Outputs DC Electrical Characteristics(5)
VCCO = 1.14V to 1.26V RL = 50 to VCCO, VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50 to VCCO or 100 across the outputs. VCC = 2.375V to 2.625V; TA = -40C to +85C, unless otherwise stated.
Symbol VOH VOUT VDIFF_OUT ROUT Parameter Output HIGH Voltage Output Voltage Swing Differential Output Voltage Swing Output Source Impedance Condition RL = 50 to VCCO See Figure 3a See Figure 3b Min VCC-0.020 300 600 45 Typ VCC-0.010 390 780 50 Max VCC 475 950 55 Units V mV mV
Three Level EQ Input DC Electrical Characteristics(5)
VCC = 2.375V to 2.625V; TA = -40C to +85C, unless otherwise stated.
Symbol VIH VIL IIH IIL
Note: 5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current
Condition
Min VCC-0.3 0
Typ
Max VCC VEE+0.3 400
Units V V uA uA
VIH = VCC VIL = GND -480
October 2008
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SY56020R
AC Electrical Characteristics
VCCO = 1.14V to 1.26V RL = 50 to VCCO, VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50 to VCCO or 100 across the outputs, VCC = 2.375V to 2.625V; TA = -40C to +85C, unless otherwise stated.
Symbol fMAX tPD tSkew tJitter tr tf
Notes: 6. 7. 8. 9. Propagation delay is measured with no attenuating transmission line connected to the input. Output-to-Output skew is the difference in time between both outputs, receiving data from the same input, for the same temperature, voltage and transition. 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. Random jitter is measured with a K28.7 pattern, measured at fMAX.
Parameter Maximum Frequency Propagation Delay Output-to-Output Skew Part-to-Part Skew Random Jitter Output Rise/Fall Time (20% to 80%) IN-to-Q
Condition NRZ Data VOUT > 200mV Note 6, Figure 1 Note 7 Note 8 Note 9 At full output swing. Clock
Min 6.4 4.5 100
Typ
Max
Units Gbps GHz
180 3
280 15 100 1
ps ps ps psRMS ps
20
50
90
October 2008
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SY56020R
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 to 1.2V, DC coupled, not 100 differentially across the outputs. If AC-coupling is used, Figure 5d, terminate into 50 to 1.2V before the coupling capacitor and then connect to a high value resistor to a reference voltage. Do not AC-couple with internally terminated receiver. For example, 50 ANY-IN input. AC-coupling will offset the output voltage by 200mV and this offset voltage will be too low for proper driver operation. Any unused output pair needs to be terminated when VCCO is 1.2V, do not leave floating. CML Output Termination with VCCO 1.8V, 2.5V For VCCO of 1.8V, Figure 5a and Figure 5b, terminate either with 50 ohms to VCCO or 100 ohms differentially across the outputs. AC- or DC-coupling is fine. For best signal integrity, terminate any unused output pairs. Input Termination From 1.8V CML driver: Terminate input with VT tied to 1.8V. Don't terminate 100 ohms differentially. From 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. Input AC-Coupling The SY56020R input can accept AC-coupling from any driver. Bypass VT with a 0.1F low ESR capacitor to VCC as shown in Figures 4c and 4d. VT has an internal high impedance resistor divider as shown in Figure 2a, to provide a bias voltage for AC-coupling.
Timing Diagrams
Figure 1. Propagation Delay
October 2008
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Micrel, Inc.
SY56020R
Typical Characteristics
VCC = 2.5, VCCO = 1.2V, GND = 0V, VIN = 400mV, RL = 50 to 1.2V, Data Pattern: 223-1, TA = 25C, unless otherwise stated.
October 2008
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SY56020R
Input and Output Stage
Figure 2a. Simplified Differential Input Buffer
Figure 2b. Simplified CML Output Buffer
Single-Ended and Differential Swings
Figure 3a. Single-Ended Swing
Figure 3b. Differential Swing
October 2008
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Micrel, Inc.
SY56020R
Input Interface Applications
Figure 4a. CML Interface (DC-Coupled, 1.8V, 2.5V) Option: May connect VT to VCC
Figure 4b. CML Interface (DC-Coupled, 1.2V)
Figure 4c. CML Interface (AC-Coupled)
Figure 4d. LVPECL Interface (AC-Coupled)
Figure 4e. LVPECL Interface (DC-Coupled)
October 2008
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Micrel, Inc.
SY56020R
CML Output Termination
Figure 5a. 1.2V, 1.8V or 2.5V CML DC-Coupled Termination
Figure 5b. 1.8V or 2.5V CML DC-Coupled Termination
Figure 5c. CML AC-Coupled Termination (VCCO 1.8V or 2.5V)
Figure 5d. CML AC-Coupled Termination (VCCO 1.2V only)
Related Product and Support Documents
Part Number HBW Solutions Function New Products and Termination Application Notes Datasheet Link http://www.micrel.com/page.do?page=/productinfo/as/HBWsolutions.shtml
October 2008
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Micrel, Inc.
SY56020R
Package Information
16-Pin MLF(R) (3mm x3mm) (MLF-16)
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. (c) 2008 Micrel, Incorporated.
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