1
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690 1
DESCRIPTION
- Precision 1:2, 400mV CML fanout buffer
- Low jitter performance:
• 49fsRMS phase jitter (typ)
- Guaranteed AC performance over temperature/
voltage:
• > 7GHz fMAX clock
• < 60ps tr/t
f times
• < 250ps tpd
• < 15ps max. skew
- 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
- 50ohms source terminated CML outputs
- Power supply 2.5V ±5% and 3.3V ±10%
- Industrial temperature range: –40°C to +85°C
- Available in 16-pin (3mm ∗∗
∗∗
∗ 3mm) QFN package
FEATURES
7GHz, 1:2 CML FANOUT
BUFFER/TRANSLATOR WITH
INTERNAL I/O TERMINATION
Precision Edge®
SY58011U
APPLICATIONS
-All SONET and GigE clock distribution
-Fibre Channel clock and data distribution
-Backplanes
-Data distribution: OC-48, OC-48+FEC, XAUI
-High-end, low skew, multiprocessor synchronous
clock distribution
Rev.: G Amendment: /0
Issue Date: November 2011
The SY58011U is a 2.5V/3.3V precision, high-speed, fully
differential 1:2 CML fanout buffer. Optimized to provide two
identical output copies with less than 15ps of skew and only
49fsRMS phase jitter, the SY58011U can process clock
signals as fast as 7GHz or data patterns up to 10.7Gbps.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that interfaces to LVPECL, LVDS,
or CML differential signals, (AC-coupled 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
(VREF-AC) is provided to bias the VT pin. The outputs are
compatible with 400mV typical swing into 50ohms loads,
with extremely fast rise/fall times guaranteed to be less than
60ps.
The SY58011U operates from a 2.5V ±5% supply or 3.3V
±10% supply and is guaranteed over the full industrial
temperature range (–40°C to +85°C). For applications that
require LVPECL outputs, consider the SY58012U or
SY58013U 1:2 fanout buffer with 800mV and 400mV output
swing, respectively. The SY58011U is part of Micrel’s high-
speed, Precision Edge® product line. Datasheets and
support documentation can be found on Micrel’s web site at
www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
TYPICAL PERFORMANCE
Precision Edge is a registered trademark of Micrel, Inc.
IN
/IN
Q1
/Q1
Q0
/Q0
V
T
50Ω
50Ω
V
REF
-AC
2GHz Output
TIME (70ps/div.)
Output Swing
(100mV/div.)
V
CC
= 2.5V
2GHz with 100mV Input
Precision Edge®
2
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
Pin Number Pin Name Pin Function
1, 4 IN, /IN Differential Input: This input pair is the signal to be buffered. Each pin of this pair
internally terminates with 50ohms to the VT pin. Note that this input will default to an
indeterminate state if left open. See “Input Interface Applications” section.
2 VT Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a
center-tap for each input (IN, /IN) to a termination network for maximum interface flexibility.
See “Input Interface Applications” section.
3 VREF-AC Reference Output Voltage: This output biases to VCC –1.2V. It is used when AC-coupling
the inputs (IN, /IN). Connect VREF-AC directly to the VT pin. Bypass with 0.01μF low ESR
capacitor to VCC. Maximum current source or sink is 0.5mA. See “Input Interface Applica
tions” section.
5, 8, 13, 16 VCC Positive Power Supply: Bypass with 0.1μF//0.01μF low ESR capacitors as close to the
VCC pins as possible.
6, 7, 14, 15 GND, Ground. Exposed pad must be connected to a ground plane that is the same potential
(Exposed Pad) as the ground pin.
12, 11 Q0, /Q0, CML Differential Output Pairs: Differential buffered output copy of the input signal. The
9, 10 Q1, /Q1 output swing is typically 400mV. Unused output pairs may be left floating with no impact on
jitter. See “CML Output Termination” section.
PIN DESCRIPTION
13141516
12
11
10
9
1
2
3
4
8765
IN
VT
VREF-AC
/IN
Q0
/Q0
/Q1
Q1
VCC
GND
GND
VCC
VCC
GND
GND
VCC
16-Pin QFN (QFN-16)
Ordering Information(1)
Package Operating Package
Part Number Type Range Marking
SY58011UMG(3) QFN-16 Industrial 011U with
Pb-Free Pb-Free bar-line indicator
SY58011UMGTR(2, 3) QFN-16 Industrial 011U with
Pb-Free Pb-Free bar-line indicator
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only.
All devices are Pb-Free.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
3
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(Note 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
Current (VT)
Source or sink current on VT pin........................ ±100mA
Input Current
Source or sink current on IN, /IN ......................... ±50mA
Current (VREF)
Source or sink current on VREF-AC, Note 4 ....... ±1.5mA
Lead Temperature Soldering, (20 seconds) ............. 260°C
Storage Temperature Range (TSTORE) ... –65°C to +150°C
Operating Ratings(Note 2)
Supply Voltage (VCC) ............................ +2.375V to +3.60V
Operating Temperature Range (TA) .......... –40°C to +85°C
Package Thermal Resistance, Note 3
QFN (θJA)
Still-Air ............................................................ 60°C/W
500lfpm ........................................................... 54°C/W
QFN (ψJB)........................................................... 33°C/W
TA= –40°C to +85°C
Symbol Parameter Condition Min Typ Max Units
VCC Power Supply Voltage 2.375 3.60 V
ICC Power Supply Current Max. VCC, no load 75 95 mA
VIH Input HIGH Voltage IN, /IN, Note 6 VCC–1.6 VCC V
VIL Input LOW Voltage IN, /IN 0 VIH–0.1 V
VIN Input Voltage Swing see Figure 1a. 0.1 1.7 V
VDIFF_IN Differential Input Voltage Swing see Figure 1b. 0.2 V
RIN Into VT Resistance 40 50 60 ý
VREF-AC Output Reference Voltage VCC –1.3 VCC –1.2 VCC –1.1 V
IN to VT1.28 V
DC ELECTRICAL CHARACTERISTICS(Note 5)
VCC = 3.3V ±10% or 2.5V ±5%; TA = –40°C to +85°C; RL = 100ý across each output pair, or equivalent, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VOH Output HIGH Voltage Q0, /Q0, Q1, /Q1 VCC –0.020 VCC –0.010 VCC V
VOUT Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1a. 325 400 mV
VDIFF_OUT Differential Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1b. 650 800 mV
ROUT Output Source Impedance Q0, /Q0, Q1, /Q1 40 50 60 ohms
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 (gnd) 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.
CML DC ELECTRICAL CHARACTERISTICS(Note 5)
4
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
VCC = 2.5V ±5% or 3.3V ±10%; TA = –40°C to +85°C; RL = 100ohms across each output pair, or equivalent, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
fMAX Maximum Operating Frequency NRZ Data 10.7 Gbps
VOUT > 200mV Clock 7 8 GHz
tpd Propagation Delay VIN > 100mV 100 170 250 ps
tCHAN Channel-to-Channel Skew Note 8 315ps
tSKEW Part-to-Part Skew Note 9 100 ps
tJITTER RMS Phase Jitter Output = 622MHz 49 fsRMS
Integration Range: 12kHz - 20MHz
tr, tfOutput Rise/Fall Time 20% to 80% at full output swing 20 40 60 ps
Notes:
7. High frequency AC electricals are guaranteed by design and characterization.
8. Skew is measured between outputs of the same bank under identical transitions.
9. 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.
AC ELECTRICAL CHARACTERISTICS (Note 7)
PHASE NOISE
RMS Phase Jitter (Random)
12kHz to 20MHz = 49fs (Typical)
OFFSET FREQUENCY (Hz)
NOISE POWER (dBc/Hz)
Phase Noise Plot: 622MHz @ 3.3V
5
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
(Typ. 400mV)
Figure 1a. Single-Ended Voltage Swing
VDIFF_IN,
VDIFF_OUT (Typ. 800mV)
Figure 1b. Differential Voltage Swing
TIMING DIAGRAM
/IN
IN
/Q
Q
t
pd
6
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
0
50
100
150
200
250
300
350
400
450
500
0
2000
4000
6000
8000
10000
12000
AMPLITUDE (mV)
FREQUENCY (MHz)
Frequency vs. Amplitude
TYPICAL OPERATING CHARACTERISTICS
VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
0
1
2
3
4
5
6
7
8
9
10
-40 -20 0 20 40 60 80 100
WITHIN-DEVICE SKEW (ps)
TEMPERATURE (°C)
Within-Device Skew vs.
Temperature
150
152
154
156
158
160
162
0 200 400 600 800 1000
PROPAGATION DELAY (ps)
INPUT VOLTAGE SWING (V)
Propagation Delay vs.
Input Voltage Swing
125
130
135
140
145
150
155
160
165
170
175
180
185
-40 -20 0 20 40 60 80 100
PROPAGATION DELAY (ps)
TEMPERATURE (°C)
Propagation Delay vs.
Temperature
VIN ≥ 200mV
7
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
FUNCTIONAL CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
2GHz Output
TIME (70ps/div.)
Output Swing
(100mV/div.)
VCC = 2.5V
7GHz Output
TIME (20ps/div.)
Output Swing
(100mV/div.)
200MHz Output
TIME (600ps/div.)
Output Swing
(100mV/div.)
8
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
INPUT INTERFACE APPLICATIONS
CML
IN
/IN
VTNC
SY58011U
V
CC
V
CC
V
REF
-ACNC
Figure 3a. DC-Coupled CML
Input Interface
(option: may connect VT to VCC)
0.01μF
V
CC
LVPECL
IN
/IN
SY58011U
V
CC
V
REF
-AC
V
T
V
CC
NC
R
pd
Note:
For V
CC
= 2.5V systems, R
pd
= 19Ω.
For V
CC
= 3.3V systems, R
pd
= 50Ω.
Figure 3c. LVPECL
Input Interface
5;#&7
m
W
W
!
Figure 3d. AC-Coupled LVPECL
Input Interface
LVDS
IN
/IN
VTNC
5;#&7
V
CC
V
CC
V
REF
-ACNC
Figure 3e. LVDS
Input Interface
CML
IN
/IN
VT
0.01
m
F
5;#&7
V
CC
V
CC
V
CC
V
REF
-AC
Figure 3b. AC-Coupled CML
Input Interface
INPUT STAGE
GND
V
CC
/IN
50
9
IN
V
T
50
9
Figure 2. Simplified Differential
Input Buffer
9
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
Part Number Function Data Sheet Link
SY58011U 7GHz, 1:2 CML Fanout Buffer/Translator with http://www.micrel.com/product-info/products/sy58011u.shtml
Internal I/O Termination
SY58012U 5GHz, 1:2 LVPECL Fanout Buffer/Translator with http://www.micrel.com/product-info/products/sy58012u.shtml
Internal Input Termination
SY58013U 6GHz, 1:2 Fanout Buffer/Translator with 400mV http://www.micrel.com/product-info/products/sy58013u.shtml
LVPECL Outputs and Internal Input Termination
16-MLF® Manufacturing Guidelines
www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
Exposed Pad Application Note
HBW Solutions http://www.micrel.com/product-info/as/solutions.shtml
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
CML OUTPUT TERMINATION
Figure 4 and Figure 5 illustrates how to terminate a CML
output using both the AC-coupled and DC-coupled
configuration. All outputs of the SY58011 are 50ohms with a
16mA current source.
9
9
9
9
9
Figure 4. CML DC-Coupled
Termination
9
9
9
9
Figure 5. CML AC-Coupled
Termination
10
SY58011U
Micrel, Inc.
M9999-110311
hbwhelp@micrel.com or (408) 955-1690
16-PIN QFN (QFN-16)
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
V
EE
V
EE
Heat Dissipation
PCB Thermal Consideration for 16-Pin QFN 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 US
A
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
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.
© 2005 Micrel, Incorporated.
