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Micrel, Inc.
6GHz, 1:6 400mV LVPECL FANOUT BUFFER WITH 2:1 MUX INPUT AND INTERNAL TERMINATION
Precision Edge SY58036U
Precision Edge(R) SY58036U (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 * <300ps IN-to-OUT tpd * <80ps tr / tf times * <20ps skew (output-to-output) 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) Unique input isolation design minimizes crosstalk 400mV LVPECL (100K compatible) output swing -40C to +85C temperature range Available in 32-pin (5mm x 5mm) MLF(R) package Precision Edge(R)
DESCRIPTION
The SY58036U 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 400mV LVPECL (100K temperature compensated), with extremely fast rise/ fall times guaranteed to be less than 80ps. The SY58036U 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 CML outputs, consider the SY58034U or for 800mV LVPECL outputs the SY58035U. The SY58036U 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
1
Rev.: D
Amendment: /0
Issue Date: February 2007
Micrel, Inc.
Precision Edge(R) SY58036U
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 SY58036UMI SY58036UMITR(2) SY58036UMG(3) SY58036UMGTR(2, 3)
Notes:
Package Type MLF-32 MLF-32 MLF-32 MLF-32
Operating Range Industrial Industrial Industrial Industrial
Package Marking SY58036U SY58036U SY58036U with Pb-Free bar-line indicator SY58036U with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb NiPdAu Pb-Free NiPdAu Pb-Free
GND NC VCC /Q5 Q5 /Q4 Q4 VCC
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.
32-Pin
MLF(R)
(MLF-32)
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 100K (temperature compensated) LVPECL output pairs are low skew copies of the selected input. Please refer to the "Truth Table" for details.
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
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 drive capability, the VREF-AC pin is only intended to drive its respective VT pin.
TRUTH TABLE
SEL 0 1 IN0 Input Selected IN1 Input Selected
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Micrel, Inc.
Precision Edge(R) SY58036U
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 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, 10 sec.) ..................... 220C 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 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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB. JB and JA are shown for a 4-layer PCB in a still air environment, 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 3.3 180
Max 2.625 3.6 250 110 55 VCC VIH-0.1 1.7
Units V V mA V V V V
Power Supply Current Differential Input Resistance (IN-to-/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) SY58036U
LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS(6)
VCC = 2.5V 5% or 3.3V 10%, RL = 50 to VCC-2V; TA= -40C to +85C, unless otherwise stated. Symbol VOH VOL VOUT VDIFF_OUT Parameter Output HIGH Voltage Output LOW Voltage Output Differential Swing Differential Output Voltage Swing See Figure 1a. See Figure 1b. Condition Min VCC-1.145 VCC-1.545 150 300 400 800 Typ Max VCC-0.895 VCC-1.295 Units V 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) SY58036U
AC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V 5% or 3.3V 10%, RL = 50 to VCC-2V; TA= -40C to +85C, 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, 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 VOUT 200mV
Min 6 150 100
Typ 7 220 220 65
Max
Units GHz
300 400
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
40
80
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) SY58036U
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) SY58036U
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, RL = 50 to VCC-2V; TA = 25C, unless otherwise stated.
Output Swing vs. Frequency
450 400
OUTPUT SWING (mV)
Propagation Delay vs. Temperature
226
PROPAGATION DELAY (ps)
350 300 250 200 150 100 50 0 0 2000 4000 6000 8000 10000 FREQUENCY (MHz)
224
222
220
218 -40 -20
0
20
40
60
80 100
TEMPERATURE (C)
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Micrel, Inc.
Precision Edge(R) SY58036U
FUNCTIONAL CHARACTERISTICS
VCC = 3.3V, GND = 0, VIN = 100mV, RL = 50 to VCC-2V; 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.)
Output Swing (100mV/div.)
TIME (25ps/div.)
TIME (20ps/div.)
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Micrel, Inc.
Precision Edge(R) SY58036U
INPUT AND OUTPUT STAGES
VCC
VCC
IN 50 VT GND 50 /IN
/Q Q
Figure 2a. Simplified Differential Input Stage
Figure 2b. Simplified LVPECL Output Stage
INPUT INTERFACE APPLICATIONS
VCC
VCC
IN
LVPECL
VCC
/IN SY58036U GND VCC 0.01F Rpd NC VREF-AC VT
IN LVPECL /IN Rpd GND GND Rpd VCC 0.01F SY58036U VREF-AC VT
GND CML
IN /IN SY58036U NC NC VREF-AC VT
For 3.3V, Rpd = 50. For 2.5V, Rpd = 19.
For 3.3V, Rpd = 100. For 2.5V, Rpd = 50.
Option: May connect VT to VCC.
Figure 3a. LVPECL Interface (DC-Coupled)
Figure 3b. LVPECL Interface (AC-Coupled)
Figure 3c. CML Interface (DC-Coupled)
VCC VCC IN CML /IN SY58036U GND VCC 0.01F VREF-AC VT GND LVDS /IN SY58036U NC NC VREF-AC VT IN
Figure 3d. CML Interface (AC-Coupled)
Figure 3e. LVDS Interface
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Micrel, Inc.
Precision Edge(R) SY58036U
OUTPUT INTERFACE APPLICATIONS
LVPECL has high input impedance, very low output (open emitter) impedance, and small signal swing, which results in low EMI. LVPECL is ideal driving 50 and 100 controlled impedance transmission lines. There are several techniques
+3.3V
for terminating the LVECL output: parallel-thevenin equivalent termination and parallel termination (3-resistor). Unused output pairs may be left floating. However, singleended outputs must be terminated, or balanced.
+3.3V
ZO = 50 ZO = 50
R1 130
R1 130 +3.3V
+3.3V
Z = 50 Z = 50 50 50
+3.3V
R2 82 Note: For 2.5V systems: R1 = 250, R2 = 62.5
R2 82
"source" Note: For 2.5V systems: R b = 19 50
"destination" VCC Rb C1 0.01F (optional)
Figure 4a. Parallel Thevenin-Equivalent Termination
Figure 4b. Parallel Termination (3-Resistor)
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number SY58034U SY58035U Function 6GHz, 1:6 CML Fanout Buffer with 2:1 MUX Input and Internal I/O Termination 4.5GHz, 1:6 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/sy58034u.shtml http://www.micrel.com/product-info/products/sy58035u.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
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Micrel, Inc.
Precision Edge(R) SY58036U
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.
TEL
2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
FAX
+ 1 (408) 944-0800
+ 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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