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Micrel, Inc.
4GHz, 1:4 LVPECL FANOUT BUFFER/ TRANSLATOR WITH INTERNAL TERMINATION
Precision Edge(R) SY58021U Precision Edge(R)
SY58021U
FEATURES
Precision 1:4, LVPECL fanout buffer Guaranteed AC performance over temperature/ voltage: * >4GHz fMAX (clock) * <100ps tr / tf Times * <300ps tpd * <15ps max skew Low jitter performance * <10pspp total jitter (clock) * <1psrms random jitter (data) * <10pspp deterministic jitter (data) Accepts an input signal as low as 100mV Unique input termination and VT pin accepts DC-coupled and AC-coupled differential inputs: LVPECL, LVDS, and CML 100k LVPECL compatible 800mV swing output Power supply 2.5V 5% and 3.3V 10% -40C to +85C temperature range Available in 16-pin (3mm x 3mm) MLFTM package Precision Edge(R)
DESCRIPTION
The SY58021U is a 2.5V/3.3V precision, high-speed, fully differential 1:4 LVPECL fanout buffer. Optimized to provide four identical output copies with less than 15ps of skew and less than 10pspp total jitter, the SY58021U can process clock signals as fast as 4GHz. The differential input includes Micrel's unique, 3-pin input termination architecture interfaces to differential LVPECL, CML, and LVDS signals (AC- or DC-coupled) as small as 100mV without any level-shifting or termination resistor networks in the signal path. For AC-coupled input interface applications, an on-board output reference voltage (VREFAC) is provided to bias the VT pin. The outputs are 100k LVPECL compatible, with extremely fast rise/fall times guaranteed to be less than 100ps. The SY58021U operates from a 2.5V 5% supply or 3.3V 10% supply and is guaranteed over the full industrial temperature range (-40C to +85C). For applications that require faster rise/fall times, or greater bandwidth, consider the SY58022U 1:4 fanout buffer with 400mV LVPECL output swing, or the SY58020U 1:4 CML fanout buffer. The SY58021U is part of Micrel's high-speed, Precision Edge(R) product line. All support documentation can be found on Micrel's web site at www.micrel.com.
APPLICATIONS
s s s s All SONET and All GigE clock distribution Fibre Channel clock and data distribution Backplane distribution High-end, low skew, multiprocessor synchronous clock distribution
FUNCTIONAL BLOCK DIAGRAM
IN 50 VT 50 /IN VREF-AC
TYPICAL PERFORMANCE
Q0 /Q0
1.25GHz Output
Q1
(200mV/div.) Amplitude
/Q1
Q2 /Q2
Q3 /Q3
Precision Edge is a registered trademark of Micrel , Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. M9999-062405 hbwhelp@micrel.com or (408) 955-1690
TIME (100ps/div.)
Rev.: D
Amendment: /0
1
Issue Date: June 2005
Micrel, Inc.
Precision Edge(R) SY58021U
PACKAGE/ORDERING INFORMATION
GND /Q0 VCC Q0
Ordering Information(1)
Part Number
12 11 10 9
16
15
14
13
Package Type MLF-16 MLF-16 MLF-16 MLF-16
Operating Range Industrial Industrial Industrial Industrial
Package Marking 021U 021U 021U with Pb-Free bar-line indicator 021U with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
IN VT VREF-AC /IN
1 2 3 4 5 6 7 8
Q1 /Q1 Q2 /Q2
SY58021UMI SY58021UMITR(2) SY58021UMG SY58021UMGTR(2)
GND
/Q3
VCC
Q3
16-Pin MLFTM (MLF-16)
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC electricals only. 2. Tape and Reel.
PIN DESCRIPTION
Pin Number 1, 4 Pin Name IN, /IN Pin Function Differential Input: This input pair receives the signal to be buffered. Each pin of this pair internally terminates with 50 to the VT pin. Note that this input will default to an indeterminate state if left open. See "Input Interface Applications" section. Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a center-tap for each input (IN, /IN) to the termination network for maximum interface flexibility. See "Input Interface Applications" section. Reference Output Voltage: This output biases to VCC -1.2V. It is used when AC-coupling to differential inputs. Connect VREF-AC directly to the VT pin. Bypass with 0.01F low ESR capacitor to VCC. See "Input Interface Applications" section. Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitors as close to the VCC pins as possible. Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The output swing is typically 800mV Proper termination is 50 to VCC-2V at the receiving end. Unused output pairs may be left floating with no impact on jitter or skew. See "LVPECL Output Termination" section.
2
VT
3
VREF-AC
8, 13 5, 16 14, 15 11, 12 9, 10 6, 7
VCC GND, Exposed Pad /Q0, Q0, /Q1, Q1, /Q2, Q2, /Q3, Q3
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Micrel, Inc.
Precision Edge(R) SY58021U
Absolute Maximum Ratings(1)
Power Supply Voltage (VCC ) ...................... -0.5V to +4.0V Input Voltage (VIN) ......................................... -0.5V to VCC LVPECL Output Current (IOUT) Continuous ............................................................. 50mA Surge .................................................................... 100mA Source or sink current on VT pin VT Current .......................................................... 100mA Source or sink current on IN, /IN Input Current ........................................................ 50mA Source or sink current on VREF-AC(4) VREF Current ....................................................... 1.5mA Soldering, (20 seconds) ............................................ 260C Storage Temperature Range (TS) ............ -65C to +150C
Operating Ratings(2)
Power Supply Voltage (VCC) ................. +2.375V to +3.60V Operating Temperature Range (TA) ........... -40C to +85C Package Thermal Resistance MLFTM (JA) Still-Air ............................................................. 60C/W 500 lpfm ........................................................... 54C/W MLFTM (JB) Junction-to-Board Resistance(3) ...................... 33C/W
INPUT DC ELECTRICAL CHARACTERISTICS(5)
TA= -40C to 85C Symbol VCC ICC VIH VIL VIN VDIFF_IN RIN VT IN VREF-AC Parameter Power Supply Voltage Power Supply Current Input HIGH Voltage Input LOW Voltage Input Voltage Swing Differential Input Voltage Swing IN-to-VT Resistance IN-to-VT Voltage Output Reference Voltage Condition VCC = 2.5V VCC = 3.3V No load, VCC = max. IN, /IN, Note 6 IN, /IN IN, /IN; see Figure 1a. IN, /IN; see Figure 1b. VCC-1.6 0 0.1 0.2 40 50 Min 2.375 3.0 Typ 2.5 3.3 125 Max 2.625 3.60 160 VCC VIH -0.1 1.7 3.4 60 1.28 VCC-1.30 VCC-1.2 VCC-1.1 Units V V mA V V V V V V
LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS(5)
VCC = 3.3V 10% or 2.5 5%; RL= 50 to VCC-2V; TA= -40C to 85C, unless otherwise stated. Symbol VOH VOL VOUT VDIFF_OUT
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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB. 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. VIH (min.) not lower than 1.2V.
Parameter Output HIGH Voltage Output LOW Voltage Output Voltage Differential Swing Differential Output Voltage Swing
Condition
Min VCC-1.145 VCC-1.945
Typ
Max VCC-0.895 VCC-1.695
Units V V mV mV
see Figure 1a. see Figure 1b.
550 1100
780 1560
1050 2100
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Micrel, Inc.
Precision Edge(R) SY58021U
AC ELECTRICAL CHARACTERISTICS
VCC = 2.5V 5% or 3.3V 10%; RL = 50 to VCC-2V; TA= -40C to +85C, unless otherwise stated. Symbol fMAX tpd tCHAN tSKEW tJITTER Parameter Maximum Operating Frequency Condition VOUT 400mV Clock NRZ Data Propagation Delay Channel-to-Channel Skew Part-to-Part Skew Clock Data tr, tf
Notes: 7. 8. 9. Skew is measured between outputs of the same bank under identical transitions. 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. 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.
Min 4
Typ
Max
Units GHz
5 150 220 4 300 15 50 1 10
Gbps ps ps ps psRMS psPP psRMS psPP ps
Note 7 Note 8 Note 9 Note 10 Note 11 Note 12 At full swing. 2.5Gbps - 3.2Gbps 2.5Gbps - 3.2Gbps 35
Cycle-to-Cycle Jitter Total Jitter Random Jitter Deterministic Jitter
1 10 75 110
Output Rise/Fall Time 20% to 80%
10. 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. 11. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps/3.2Gbps. 12. Deterministic jitter is measured at 2.5Gbps/3.2Gbps with both K28.5 and 223-1 PRBS pattern
TIMING DIAGRAM
/IN IN
/Q Q tpd
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VIN, VOUT 800mV
VDIFF_IN, VDIFF_OUT 1.6V
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
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Micrel, Inc.
Precision Edge(R) SY58021U
TYPCIAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25C, unless otherwise stated.
900 800 700 600 500 400 300 200 100 0
Amplitude vs. Frequency
194
PROPAGATION DELAY (ps)
Propagation Delay vs. Input Voltage Swing
184
PROPAGATION DELAY (ps)
Propagation Delay vs. Temperature
183 182 181 180 179 178 177 176 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
AMPLITUDE (mV)
192 190 188 186 184 182 180 178 176 174 0 200 400 600 800 1000 1200 INPUT VOLTAGE SWING (mV)
10000
FREQUENCY (MHz)
Skew vs. Temperature
4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
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SKEW (ps)
12000
0
2000
4000
6000
8000
5
Micrel, Inc.
Precision Edge(R) SY58021U
FUNCTIONAL CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25C, unless otherwise stated.
200MHz Output
5GHz Output
Amplitude (200mV/div.)
TIME (600ps/div.)
Amplitude (200mV/div.)
TIME (25ps/div.)
4GHz Output
Amplitude (200mV/div.)
TIME (30ps/div.)
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Micrel, Inc.
Precision Edge(R) SY58021U
INPUT STAGE
VCC
IN 50 VT GND 50 /IN
Figure 2. Simplified Differential Input Buffer
INPUT INTERFACE APPLICATIONS
VCC VCC
VCC
VCC VCC IN VCC
IN
LVPECL
LVPECL
/IN SY58021U VT 0.01F VDD Rpd NC VREF-AC
/IN SY58021U Rpd Rpd VT VREF-AC 0.01F For 3.3V, Rpd = 100 For 2.5V, Rpd = 50 VCC
IN LVDS /IN SY58021U NC NC VT VREF-AC
For VCC = 2.5V, Rpd = 19 For VCC = 3.3V, Rpd = 50
Figure 3a. LVPECL Input Interface
VCC VCC
Figure 3b. AC-Coupled LVPECL Input Interface
VCC VCC
Figure 3c. LVDS Input Interface
IN CML /IN SY58021U NC NC VT VREF-AC
0.01F CML
IN /IN SY58021U VT VREF-AC
Option: May connect VT to VCC
VCC
Figure 3d. DC-Coupled CML Input Interface
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Figure 3e. AC-Coupled CML Input Interface
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Micrel, Inc.
Precision Edge(R) SY58021U
LVPECL OUTPUT
LVPECL output have very low output impedance (open emitter), and small signal swing which results in low EMI. LVPECL is ideal for driving 50 and 100 controlled
+3.3V*
+3.3V Z = 50 Z = 50 50 "source" 50 "destination" 50
VDD
impedance transmission lines. There are several techniques in terminating the LVPECL output, as shown in Figures 4 through 6.
+3.3V
+3.3V*
SY58021U
ZO = 50 ZO = 50
R1 130
R1 130
+3.3V*
SY58021U
*Note. For +2.5V systems, R1 = 250, R2 = 62.5
R2 82
R2 82
VT = VCC --2V
Rb*
C1 (optional) 0.01F
* For +2.5V, Rb = 19 Notes: * For +3.3V, Rb = 46 to 50 1. Power saving alternative to Thevenin termination. 2. Place termination resistors as close to destination inputs as possible. 3. Rb resistor sets the DC bias voltage, equal to VT.
Figure 4. Parallel Termination-Thevenin Equivalent
Figure 5. Parallel Termination (3-Resistor)
+3.3V*
+3.3V*
SY58021U
ZO = 50 ZO = 50
R1 130
R1 130
+3.3V*
*Note: For +2.5V systems, R1 = 250, R2 = 62.5
R2 82
R2 82
VT = VCC --2V
Figure 6. Terminating Unused I/O
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number SY58020U SY58021U SY58022U Function 6GHz, 1:4 CML Fanout Buffer/Translator Internal I/O Termnations 4GHz, 1:4 LVPECL Fanout Buffer/Translator with Internal Termination 5.5GHz, 1:4 Fanout Buffer/Translator w/400mV LVPECL Outputs and Internal Terminations 16-MLFTM Manufacturing Guidelines Exposed Pad Application Note M-0317 HBW Solutions Data Sheet Link http://www.micrel.com/product-info/products/sy58020u.shtml http://www.micrel.com/product-info/products/sy58021u.shtml http://www.micrel.com/product-info/products/sy58022u.shtml www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf http://www.micrel.com/product-info/as/solutions.shtml
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Micrel, Inc.
Precision Edge(R) SY58021U
16 LEAD MicroLeadFrameTM (MLF-16)
Package EP- Exposed Pad
Die
CompSide Island
Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane
PCB Thermal Consideration for 16-Pin MLFTM 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
TEL
USA
+ 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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. M9999-062405 hbwhelp@micrel.com or (408) 955-1690
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