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Micrel, Inc.
6GHz, 1:6 CML FANOUT BUFFER WITH 2:1 MUX INPUT AND INTERNAL I/O TERMINATION
Precision Edge SY58034U
Precision Edge(R) SY58034U (R)
FEATURES
Provides six ultra-low skew copies of the selected input 2:1 MUX input included for clock switchover applications Guaranteed AC performance over temperature and voltage: * Clock frequency range: DC to > 6GHz * <290ps IN-to-OUT tpd * <60ps tr / tf times * <20ps skew (output-to-output) Unique input isolation design minimizes crosstalk Ultra low-jitter design: * <1psRMS random jitter * <10psPP total jitter (clock) * <1psRMS cycle-to-cycle jitter * <0.7psRMS crosstalk-induced jitter Low supply voltage operation: 2.5V and 3.3V Unique input termination and VT pin accepts DCcoupled and AC-coupled inputs (CML, PECL, LVDS) Internal 50 output source termination 400mV CML output swing -40C to +85C temperature range Available in 32-pin (5mm x 5mm) MLF(R) package
Precision Edge(R)
DESCRIPTION
The SY58034U is a 2.5V/3.3V precision, high-speed 1:6 fanout buffer capable of handling clocks up to 6GHz. A differential 2:1 MUX input is included for redundant clock switchover applications. The differential input includes Micrel's unique, 3-pin input termination architecture that allows the device 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 outputs are 50 source terminated CML, with extremely fast rise/fall times guaranteed to be less than 60ps. The SY58034U operates from a 2.5V 5% supply or a 3.3V 10% supply and is guaranteed over the full industrial temperature range of -40C to +85C. For applications that require LVPECL outputs, consider the SY58035U or SY58036U Multiplexers. The SY58034U 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
Redundant clock distribution All SONET/SDH clock distribution All Fibre Channel distribution All Gigabit Ethernet clock distribution
FUNCTIONAL BLOCK DIAGRAM
1:6 Fanout
Q0 /Q0
IN0 50 VT0 50 /IN0 VREF-AC0 IN1 50 VT1 50 /IN1 VREF-AC1 SEL (TTL/CMOS) 1 S 0 2:1 MUX
Q1 /Q1 Q2
MUX
/Q2 Q3 /Q3 Q4 /Q4 Q5 /Q5
Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-020707 hbwhelp@micrel.com or (408) 955-1690
Rev.: D Amendment: /0
1
Issue Date: February 2007
Micrel, Inc.
Precision Edge(R) SY58034U
PACKAGE/ORDERING INFORMATION
GND SEL VCC Q0 /Q0 Q1 /Q1 VCC
Ordering Information(1)
GND VCC Q2 /Q2 Q3 /Q3 VCC GND
32 31 30 29 28 27 26 25
IN0 VT0 VREF-AC0 /IN0 IN1 VT1 VREF-AC1 /IN1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
24 23 22 21 20 19 18 17
Part Number SY58034UMI SY58034UMITR(2) SY58034UMG(3) SY58034UMGTR(2, 3)
Notes:
Package Operating Type Range MLF-32 MLF-32 MLF-32 MLF-32 Industrial Industrial Industrial Industrial
Package Marking SY58034U SY58034U
Lead Finish Sn-Pb Sn-Pb
SY58034U with NiPdAu Pb-free bar-line indicator Pb-Free SY58034U with NiPdAu Pb-free bar-line indicator Pb-Free
GND NC VCC /Q5 Q5 /Q4 Q4 VCC
32-Pin MLF(R) (MLF-32)
1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC electricals only. 2. Tape and Reel. 3. Pb-Free package recommended for new designs.
PIN DESCRIPTION
Pin Number 1, 4 5, 8 Pin Name IN0, /IN0 IN1, /IN1 Pin Function Differential Input: These input pairs are the differential signal inputs to the device. These inputs accept AC- or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates to a VT pin through 50. Note that these inputs will default to an indeterminate state if left open. Please refer to the "Input Interface Applications" section for more details. Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT0 and VT1 pins provide a center-tap to a termination network for maximum interface flexibility. See "Input Interface Applications" section for more details. This single-ended TTL/CMOS-compatible input selects the inputs to the multiplexer. Note that this input is internally connected to a 25k pull-up resistor and will default to a logic HIGH state if left open. The MUX select switchover function is asynchronous. No connect. Positive Power Supply: Bypass with 0.1F0.01F low ESR capacitors and place as close to the VCC pins as possible. Differential Outputs: These CML output pairs are low skew output copies of the selected input. The output stage is optimized to deliver a 400mV swing (single-ended) into 50. Each output includes a 50 source-termination resistor, thus minimizing any return reflections. Unused output pins may be left floating. Please refer to the "Truth Table" for details. Ground. Ground pin and exposed pad must be connected to the same ground plane. Reference Voltage: These output biases to VCC-1.2V. It is used for AC-coupling inputs (IN, /IN). Connect VREF-AC directly to the VT pin. Bypass with 0.01F low ESR capacitor to VCC. See "Input Interface Applications" section. Maximum sink/source current is 1.5mA. Due to the limited capability, the VREF-AC pin is only intended to drive its respective VT pin.
2, 6
VT0, VT1
31
SEL
10 11, 16, 18, 23, 25, 30 29, 28 27, 26 22, 21 20, 19 15, 14 13, 12 9, 17, 24, 32 3, 7
NC VCC Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5 GND, Exposed Pad VREF-AC0, VREF-AC1
TRUTH TABLE
SEL 0 1 IN0 Input Selected IN1 Input Selected
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2
Micrel, Inc.
Precision Edge(R) SY58034U
Absolute Maximum Ratings(1)
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 Source or sink current on VT pin ........................ 100mA Input Current Source or sink current on IN, /IN pin .................... 50mA Source or sink current on VREF-AC pin ................ 2mA Lead Temperature (soldering, 20 sec.) ..................... 260C Storage Temperature Range (TS ) ........... -65C to +150C
Operating Ratings(2)
Power Supply Voltage (VCC) ............... +2.375V to +2.625V ............................................................ +3.0V to +3.6V Ambient Temperature Range (TA) ............. -40C to +85C Package Thermal Resistance(3) MLF(R) (JA) Still-Air ............................................................. 35C/W MLF(R) (JB) Junction-to-Board ............................................ 16C/W
DC ELECTRICAL CHARACTERISTICS(4)
TA= -40C to 85C, unless otherwise stated. Symbol VCC ICC RDIFF_IN RIN VIH VIL VIN VDIFF_IN VT IN VREF-AC
Notes: 1. Permanent device damage may occur if the measurements 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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB. JB and JA are determined for a 4-layer board in a still air, unless otherwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Parameter Power Supply Voltage
Condition
Min 2.375 3.0
Typ 2.5 3.3 245
Max 2.625 3.6 320 110 55 VCC VIH-0.1 1.7
Units V V mA V V V V
Power Supply Current Differential Input Resistance |IN-/IN| Input Resistance (IN-to-VT) Input HIGH Voltage (IN, /IN) Input LOW Voltage (IN, /IN) Input Voltage Swing (IN, /IN) Differential Input Voltage Swing |IN, /IN| IN to VT (IN, /IN) Reference Voltage
No load, max. VCC 90 45 VCC-1.2 0 See Figure 1a. See Figure 1b. 0.1 0.2
100 50
1.28 VCC-1.3 VCC-1.2 VCC-1.1
V V
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Micrel, Inc.
Precision Edge(R) SY58034U
CML OUTPUT DC ELECTRICAL CHARACTERISTICS(6)
VCC = 2.5V 5% or 3.3V 10%; TA= -40C to 85C; RL = 100 across each output pair or equivalent, 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 VCC See Figure 1a. See Figure 1b. Min VCC-0.020 325 650 40 400 800 50 60 Typ Max VCC Units V mV mV
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(6)
VCC = 2.5V 5% or 3.3V 10%; TA= -40C to 85C, unless otherwise stated. Symbol VIH VIL IIH IIL
Note: 6. 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 2.0
Typ
Max
Units V
0.8 -125 -300 40
V A A
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Micrel, Inc.
Precision Edge(R) SY58034U
AC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V 5% or 3.3V 10%; TA= -40C to 85C, RL= 100 across each output pair, or equivalent, unless otherwise stated. Symbol fMAX tpd Parameter Maximum Operating Frequency Differential Propagation Delay (IN0 or IN1-to-Q) (SEL-to-Q) tpd Tempco tSKEW Differential Propagation Delay Temperature Coefficient Output-to-Output Part-to-Part tJITTER Clock Cycle-to-Cycle Jitter Random Jitter (RJ) Total Jitter (TJ) Adjacent Channel Crosstalk-Induced Jitter tr, tf
Notes: 7. High frequency AC electricals are guaranteed by design and characterization. 8. Output-to-output skew is measured between outputs under identical transitions. 9. 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. 10. 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. 11. Random jitter is measured with a K28.7 pattern, measured at 2.5Gbps. 12. 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. 13. Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs.
Condition Clock VOUT 200mV
Min 6 140 100
Typ 7.5 220 200 65
Max
Units GHz
290 400
ps ps fs/C
Note 8 Note 9 Note 10 Note 11 Note 12 Note 13
20 100 1 1 10 0.7
ps ps psRMS psRMS psPP psRMS ps
Output Rise/Fall Time
Full swing, 20% to 80%
20
60
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VIN, VOUT 400mV (Typ.)
VDIFF_IN, VDIFF_OUT 800mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
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Micrel, Inc.
Precision Edge(R) SY58034U
TIMING DIAGRAMS
IN /IN tpd Q /Q Input-to-Q tpd
SEL
VCC/2 tpd
VCC/2 tpd
Q /Q SEL-to-Q tpd
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Micrel, Inc.
Precision Edge(R) SY58034U
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, RL = 100 across the output; TA = 25C, unless otherwise stated.
500 450 400 350 300 250 200 150 100 50 0 0
Output Swing vs. Frequency
PROPAGATION DELAY (ps)
224 222 220 218 216
Propagation Delay vs. Temperature
OUTPUT SWING (mV)
2000 4000 6000 8000 10000 FREQUENCY (MHz)
214 -40 -20
0
20
40
60
80 100
TEMPERATURE (C)
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Micrel, Inc.
Precision Edge(R) SY58034U
FUNCTIONAL CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 400mV, RL = 100 across the output; TA = 25C, unless otherwise stated.
200MHz Output
2.5GHz Output
Output Swing (100mV/div.)
TIME (600ps/div.)
Output Swing (100mV/div.)
TIME (50ps/div.)
5GHz Output
7GHz Output
Output Swing (100mV/div.)
TIME (30ps/div.)
Output Swing (100mV/div.)
TIME (20ps/div.)
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Micrel, Inc.
Precision Edge(R) SY58034U
INPUT AND OUTPUT STAGES
VCC
VCC
IN 50 VT GND 50 /IN
50
50 /Q Q
GND
Figure 2a. Simplified Differential Input Stage
Figure 2b. Simplified CML Output Stage
INPUT INTERFACE APPLICATIONS
VCC
VCC
VCC IN LVPECL IN /IN SY58034U /IN SY58034U GND VCC 0.01F VREF-AC VT GND VCC 0.01F Rpd For 3.3V, Rpd = 50. For 3.5V, Rpd = 19. NC VREF-AC VT
IN CML /IN SY58034U GND NC NC VREF-AC VT
CML
Option: May connect VT to VCC.
Figure 3a. CML Interface (DC-Coupled)
VCC
Figure 3b. CML Interface (AC-Coupled)
Figure 3c. LVPECL Interface (DC-Coupled)
VCC
IN LVPECL /IN
LVDS IN
Rpd GND
Rpd VCC GND 0.01F
SY58034U VREF-AC VT
GND NC NC
/IN SY58034U VREF-AC VT
For 3.3V, Rpd = 100 For 2.5V, Rpd = 50
Figure 3d. LVPECL Interface (AC-Coupled)
Figure 3e. LVDS Interface
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Micrel, Inc.
Precision Edge(R) SY58034U
OUTPUT INTERFACE APPLICATIONS
VCC
VCC
50 /Q
50
50 /Q
50 50 DC bias point per application Q 50
100 Q
16mA GND
16mA GND
Figure 4. CML DC-Coupled Termination
Figure 5. CML AC-Coupled Termination
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number SY58035U SY58036U Function 4.5GHz, 1:6 LVPECL Fanout Buffer with 2:1 MUX Input and Internal Termination 6GHz, 1:6 400mV LVPECL Fanout Buffer with 2:1 MUX Input and Internal Termination MLF(R) Application Note HBW Solutions New Products and Applications Data Sheet Link http://www.micrel.com/product-info/products/sy58035u.shtml http://www.micrel.com/product-info/products/sy58036u.shtml www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf www.micrel.com/product-info/products/solutions.shtml
M9999-020707 hbwhelp@micrel.com or (408) 955-1690
10
Micrel, Inc.
Precision Edge(R) SY58034U
32-PIN MicroLeadFrame(R) (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(R) 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
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. M9999-020707 hbwhelp@micrel.com or (408) 955-1690
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