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Micrel, Inc.
ULTRA-PRECISION 1:8 FANOUT BUFFER WITH LVPECL OUTPUTS AND INTERNAL TERMINATION
Precision Edge SY58032U
Precision Edge(R) SY58032U (R)
FEATURES
Precision 1:8, LVPECL fanout buffer Guaranteed AC performance over temperature and voltage: * Clock frequency range: DC to 4GHz * <110ps tr / tf times * <330ps tpd * <20ps skew Low-jitter performance: * <10psPP total jitter (clock) * <1psRMS random jitter 100k LVPECL compatible outputs Fully differential inputs/outputs Accepts an input signal as low as 100mV Unique input termination and VT pin accepts DCcoupled and AC-coupled differential inputs: (LVPECL, LVDS, and CML) Power supply 2.5V 5% or 3.3V 10% Industrial temperature range: -40C to +85C Available in 32-pin (5mm x 5mm) MLF(R) package Precision Edge(R)
DESCRIPTION
The SY58032U is a 2.5V/3.3V precision, high-speed, fully differential LVPECL 1:8 fanout buffer. The SY58032U is optimized to provide eight identical output copies with less than 20ps of skew and less than 10pspp total jitter. It can process clock signals as fast as 4GHz. The differential input includes Micrel's unique, 3-pin input termination architecture that allows the SY58032U to directly interface to LVPECL, CML, and LVDS differential signals (AC- or DC-coupled) without any level-shifting or termination resistor networks in the signal path. The result is a clean, stub-free, low-jitter interface solution. The LVPECL (100k temperature compensated) outputs feature 800mV typical swing into 50 loads, and provide an extremely fast rise/fall time guaranteed to be less than 110ps. The SY58032U 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 a higher high-speed 1:8 fanout buffer, consider the SY58031U or SY58033U. The SY58032U 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
All SONET and all GigE clock distribution All Fibre Channel clock and data distribution Network routing engine timing distribution High-end, low-skew multiprocessor synchronous clock distribution
FUNCTIONAL BLOCK DIAGRAM
Q0 /Q0 Q1 /Q1 Q2 /Q2
IN 50 VT 50 /IN
Q3 /Q3 Q4 /Q4
VREF-AC
Q5 /Q5 Q6 /Q6 Q7
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
/Q7
Amendment: /0
1
Issue Date: February 2007
Micrel, Inc.
Precision Edge(R) SY58032U
PACKAGE/ORDERING INFORMATION
VCC Q0 /Q0 Q1 /Q1 Q2 /Q2 VCC
Ordering Information(1)
GND VCC Q3 /Q3 Q4 /Q4 VCC GND
32 31 30 29 28 27 26 25
VCC GND IN VT VREF-AC /IN GND VCC
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 SY58032UMI SY58032UMITR(2) SY58032UMG(3) SY58032UMGTR(2, 3)
Package Type MLF-32 MLF-32 MLF-32 MLF-32
Operating Range Industrial Industrial Industrial Industrial
Package Marking SY58032U SY58032U SY58032U with Pb-Free bar-line indicator SY58032U with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
VCC /Q7 Q7 /Q6 Q6 /Q5 Q5 VCC
32-Pin MLF(R) (MLF-32)
Notes: 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 3, 6 Pin Name IN, /IN Pin Function Differential Signal Input: 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. Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin. Positive Power Supply: Bypass with 0.1F0.01F low ESR capacitors as close to the pins as possible. 100k LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The LVPECL output swing is typically 800mV into 50. Unused output pairs may be left floating with no impact on jitter. See "LVPECL Output" section. Bias Reference Voltage: Equal to VCC-1.2V (typical), and used for AC-coupled applications. See "Input Interface Applications" section. When using VREF-AC, bypass with 0.01F capacitor to VCC. Maximum sink/source current is 0.5mA.
4
VT
2, 7, 17, 24 1, 8, 9, 16, 18, 23, 25, 32 31, 30, 29, 28, 27, 26, 22, 21, 20, 19, 15, 14, 13, 12, 11, 10 5
GND, Exposed Pad VCC Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5, Q6, /Q6, Q7, /Q7 VREF-AC
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2
Micrel, Inc.
Precision Edge(R) SY58032U
Absolute Maximum Ratings(1)
Power Supply Voltage (VCC ) ...................... -0.5V to +4.0V Input Voltage (VIN) ......................................... -0.5V to VCC Current (VT) Source or sink current on VT pin ........................ 100mA Input Current (VT) Source or sink current on IN, /IN .......................... 50mA Current (VREF) Source or sink current on VREF-AC(3) ....................... 1.5mA Lead Temperature Soldering, (20 sec.) .................... 260C Storage Temperature Range (TS ) ........... -65C to +150C
Operating Ratings(2)
Power Supply Voltage (VCC) ................. +2.375V to +3.60V Ambient Temperature Range (TA) ............. -40C to +85C Package Thermal Resistance(4) MLF(R) (JA) Still-Air ............................................................. 35C/W MLF(R) (JB) Junction-to-Board ............................................ 20C/W
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 |IN0, /IN0|, |IN1, /IN1| In-to-VT Resistance Max. In-to-VT (IN, /IN) Condition 2.5V nominal 3.3V nominal VCC = max. No load. Includes current through 50 pull-ups. IN, /IN IN, /IN IN, /IN, see Figure 1a. IN, /IN, see Figure 1b. VCC-1.2 0 0.1 0.2 40 50 60 1.28 VCC-1.3 VCC-1.2 VCC-1.1 Min 2.375 3.0 Typ 2.5 3.3 190 Max 2.625 3.6 250 VCC VIH-0.1 1.7 Units V V mA V V V V V V
LVPECL DC ELECTRICAL CHARACTERISTICS(5)
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
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. Due to the limited drive capability, use for input of the same package only. 4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential (GND) on the PCB. JB uses 4-layer JA in still-air number unless otherwise stated. 5. The circuit is designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established.
Parameter Output HIGH Voltage Output LOW Voltage Output Voltage Swing Differential Voltage Swing
Condition
Min VCC-1.145 VCC-1.945
Typ
Max VCC-0.895 VCC-1.695
Units V V mV
see Figure 1a. see Figure 1b.
500 1000
800 1600 2000
mV
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Micrel, Inc.
Precision Edge(R) SY58032U
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 tpd tempco tSKEW tJITTER Parameter Maximum Operating Frequency Propagation Delay (IN-to-Q) Condition VOUT 400mV Clock Min 4 180 260 35 Note 8 Note 9 Note 10 Note 11 Note 12 20% to 80%, at full output swing. 35 75 7 20 100 1 10 1 110 330 Typ Max Units GHz ps fs/C ps ps psRMS psPP psRMS ps
Differential Propagation Delay Temperature Coefficient Output-to-Output Skew (within Device) Part-to-Part Skew Clock Cycle-to-Cycle Jitter Total Jitter (Clock) Random Jitter (RJ)
tr, tf
Notes: 7. 8. 9.
Output Rise/Fall Time
High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50 to VCC - 2V, VIN 100mV. Output-to-output skew is measured between outputs under identical transitions. 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. Part-to-part skew includes variation in tpd.
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. 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. 12. Random jitter is measured with a K28.7 comma detect character pattern, measured at 1.25Gbps and 2.5Gbps.
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VIN, VOUT 800mV (Typ.)
VDIFF_IN, VDIFF_OUT 1.6V (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
TIMING DIAGRAM
/IN VIN IN tpd /Q VOUT Q tpd
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Micrel, Inc.
Precision Edge(R) SY58032U
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA= 25C, unless otherwise stated.
200MHz Output 1.25GHz Output
Output Swing (200mV/div.)
TIME (600ps/div.)
Output Swing (200mV/div.)
TIME (100ps/div.)
4GHz Output
Output Swing (200mV/div.)
TIME (30ps/div.)
Amplitude vs. Frequency
Output-to-Output Skew
2.5 2
900 800 AMPLITUDE (mV) 700 600 500 400 300 200
vs. Temperature
SKEW (ps)
1.5 1 0.5 0 -60 -40 -20 0
1000
2000
3000
4000
5000
6000
7000
8000
0
100 V = 400mV IN 0
20 40 60 80 100
TEMPERATURE (C)
FREQUENCY (MHz)
265 PROPAGATION DELAY (ps) 260 255 250 245 240 235 230 0
Propagation Delay vs. Input Swing
PROPAGATION DELAY (ps)
235.5 235 234.5 234 233.5 233 232.5 232
Propagation Delay vs. Temperature
VIN = 800mV
200
400
600
800
1000
231.5 -60 -40 -20 0
20 40 60 80 100
INPUT SWING (mV)
TEMPERATURE (C)
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Micrel, Inc.
Precision Edge(R) SY58032U
INPUT BUFFER
VCC
IN 50 VT 50 /IN GND
Figure 2. Simplified Differential Input Buffer
INPUT INTERFACE APPLICATIONS
VCC VCC
VCC
VCC
VCC
VCC
LVPECL
IN /IN
IN CML /IN SY58032U GND NC NC VREF-AC VT
VCC GND 0.01F CML
IN /IN SY58032U VREF-AC VT
For 2.5V, Rpd = 19 For 3.3V, Rpd = 50 GND VCC 0.01F Rpd
SY58032U VREF-AC VT
Figure 3a. DC-Coupled CML Input Interface
Option: May connect VT to VCC .
Figure 3b. AC-Coupled CML Input Interface
Figure 3c. LVPECL Input Interface
VCC
VCC
VCC VCC
IN LVPECL /IN Rpd GND GND For 3.3V, Rpd = 100 For 2.5V, Rpd = 50 Rpd SY58032U VREF-AC VT
GND NC NC LVDS /IN SY58032U VREF-AC VT IN
VCC
Figure 3d. AC-Coupled LVPECL Input Interface
M9999-020707 hbwhelp@micrel.com or (408) 955-1690
Figure 3e. LVDS Input Interface
6
Micrel, Inc.
Precision Edge(R) SY58032U
LVPECL OUTPUT
LVPECL has high input impedance, and very low output impedance (open emitter), and small signal swing which results in low EMI. LVPECL is ideal for driving 50 and 100 controlled impedance transmission lines. There are several techniques for terminating the LVPECL output: Parallel Termination-Thevenin Equivalent, Parallel Termination (3-resistor), and AC-coupled Termination. Unused output pairs may be left floating. However, singleended outputs must be terminated, or balanced.
+3.3V
+3.3V
ZO = 50 ZO = 50
R1 130
R1 130
+3.3V
For +2.5V systems, R1 = 250, R2 = 62.5
R2 82
R2 82
VT = VCC -2V
Figure 4. Parallel Termination-Thevenin Equivalent
+3.3V
Z = 50 Z = 50 50 50 Rb
+3.3V
"source"
"destination" VCC C1 (optional)
Notes: 0.01F 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. 4. For 2.5V systems, Rb = 19, For 3.3V systems, Rb = 50
Figure 5. Parallel Termination (3-Resistor)
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number SY58031U SY58032U SY58033U Function Ultra-Precision 1:8 Fanout Buffer with 400mV CML Outputs and Internal I/O Termination Ultra-Precision 1:8 Fanout Buffer with LVPECL Outputs and Internal Termination Ultra-Precision 1:8 Fanout Buffer with 400mV LVPECL Outputs and Internal Termination 32-MLF(R) Manufacturing Guidelines Exposed Pad Application Note HBW Solutions Data Sheet Link http://www.micrel.com/product-info/products/sy58031u.shtml http://www.micrel.com/product-info/products/sy58032u.shtml http://www.micrel.com/product-info/products/sy58033u.shtml www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf http://www.micrel.com/product-info/as/solutions.shtml
M9999-020707 hbwhelp@micrel.com or (408) 955-1690
7
Micrel, Inc.
Precision Edge(R) SY58032U
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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