MICREL SY58033UMI

®
Micrel, Inc.
Precision Edge
ULTRA-PRECISION 1:8 fanout SY58033U
®
buffer WITH 400mV LVPECL outputs Precision Edge
SY58033U
and INTERNAL TERMINATION
FEATURES
■ Precision 1:8, 400mV LVPECL fanout buffer
■ Guaranteed AC performance over temperature and
voltage:
• Clock frequency range: DC to 5.5GHz
• <80ps tr / tf times
• <280ps tpd
• <20ps skew
■ Low-jitter performance:
• 76fsRMS phase jitter (typ)
■ 100k LVPECL compatible outputs
■ Fully differential inputs/outputs
■ 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)
■ Power supply 2.5V ±5% or 3.3V ±10%
■ Industrial temperature range: –40°C to +85°C
■ Available in 32-pin (5mm x 5mm) MLF® Package
Precision Edge®
DESCRIPTION
The SY58033U is a 2.5V/3.3V precision, high-speed, fully
differential 400mV LVPECL 1:8 fanout buffer. The SY58033U
is optimized to provide eight identical output copies with
less than 20ps of skew and only 76fsRMS phase jitter. It can
process clock signals as fast as 5.5GHz.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows the SY58033U to
directly interface to LVPECL, CML, and LVDS differential
signal (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 solution. The LVPECL (100k
temperature compensated) outputs feature a 400mV typical
swing into 50ý loads, and provide an extremely fast rise/fall
time guaranteed to be less than 80ps.
The SY58033U 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). Other high-speed 1:8
fanout buffers include the CML SY58031U and the 800mV
LVPECL SY58032U. The SY58033U is part of Micrel’s highspeed, Precision Edge® product line.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
APPLICATIONS
■
■
■
■
Functional block diagram
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
Q0
/Q0
Q1
/Q1
Q2
/Q2
IN
Q3
50Ω
VT
/Q3
50Ω
/IN
Q4
/Q4
V REF-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.
M9999-072810
[email protected] or (408) 955-1690
1
/Q7
Rev.: E
Amendment: /0
Issue Date: July 2010
Precision Edge®
SY58033U
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
VCC
Q0
/Q0
Q1
/Q1
Q2
/Q2
VCC
Ordering Information(1)
24
2
23
3
22
4
21
5
20
6
19
7
18
8
9 10 11 12 13 14 15 16
17
GND
VCC
Q3
/Q3
Q4
/Q4
VCC
GND
VCC
/Q7
Q7
/Q6
Q6
/Q5
Q5
VCC
VCC
GND
IN
VT
VREF-AC
/IN
GND
VCC
32 31 30 29 28 27 26 25
1
32-Pin MLF® (MLF-32)
Part Number
Package
Type
Operating Range
Package
Marking
Lead
Finish
SY58033UMI
MLF-32
Industrial
SY58033U
Sn-Pb
SY58033UMITR(2)
MLF-32
Industrial
SY58033U
Sn-Pb
SY58033UMG(3)
MLF-32
Industrial
SY58033U with Pb-Free bar-line indicator
Pb-Free
NiPdAu
Industrial
SY58033UMGTR(2, 3) MLF-32
SY58033U with Pb-Free bar-line indicator
Pb-Free
NiPdAu
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
PIN DESCRIPTION
Pin Number Pin Name
Pin Function
3, 6
IN, /IN
Differential Signal Input: Each pin of this pair internally terminates with 50ý to the VT pin. Note that this input will default to an indeterminate state if left open.
See “Input Interface Applications” section.
4
VT
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.
2, 7, 17, 24
Ground. Exposed pad must be connected to a ground plane that is the same potential as the ground pin.
GND,
Exposed Pad
1, 8, 9, 16, VCC
18, 23, 25, 32
31, 30, 29, 28, 27, 26, 22, 21, 20, 19,
15, 14, 13, 12, 11, 10
Q0, /Q0, Q1, /Q1,
Q2, /Q2, Q3, /Q3
Q4, /Q4, Q5, /Q5,
Q6, /Q6, Q7, /Q7
5
VREF-AC
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Positive Power Supply: Bypass with 0.1µF||0.01µF low ESR capacitors as close to the pins as possible.
400mV LVPECL Differential Output Pairs: Differential buffered output copy of the
input signal. The LVPECL output swing is typically 400mV into 50Ω. Unused output pairs may be left floating with no impact on jitter. See “LVPECL Output” section.
Bias Reference Voltage: Equal to VCC–1.2V (approx.), and used for AC-coupled
applications. See “Input Interface Applications” section. When using VREF-AC, bypass with 0.01µF capacitor to VCC. Maximum sink/source current is 0.5mA.
2
Precision Edge®
SY58033U
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(2)
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.)....................... 260°C
Storage Temperature Range (TS )............. –65°C to +150°C
Power Supply Voltage (VCC).................. +2.375V to +3.60V
Ambient Temperature Range (TA)............... –40°C to +85°C
Package Thermal Resistance(4)
MLF® (θJA)
Still-Air.............................................................. 35°C/W
MLF® (ψJB)
Junction-to-Board............................................. 20°C/W
DC ELECTRICAL CHARACTERISTICS(5)
TA= –40°C to +85°C.
Symbol
Parameter
Condition
Power Supply Voltage
VCC 2.5V nominal
3.3V nominal
ICC Power Supply Current
VCC = max. No. load includes current through 50Ω pull-ups.
VIH Input HIGH Voltage
IN, /IN, Note 6
Input LOW Voltage
IN, /IN
VIN
Input Voltage Swing
IN, /IN, see Figure 1a.
0.1
VDIFF_IN
Differential Input Voltage Swing
|IN0, /IN0|, |IN1, /IN1|
IN, /IN, see Figure 1b.
0.2
V
RIN
In-to-VT Resistance
40
60
Ω
1.28
V
VIL VT IN
Min
Typ
Max
Units
2.375
3.0
2.5
3.3
2.625
3.6
V
V
180
250
mA
VCC
V
1.7
V
VCC–1.6
0
50
Max. In-to-VT (IN, /IN)
VIH–0.1
VCC–1.3 VCC–1.2VCC–1.1
VREF-AC
V
V
LVPECL DC Electrical Characteristics(5)
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50ý to VCC–2V; TA= –40°C to +85°C unless otherwise stated
Symbol
VOH VOL VOUT
VDIFF_OUT
Parameter
Condition
Output HIGH Voltage
Min
Typ
VCC–1.145
Output LOW Voltage
Output Voltage Swing
see Figure 1a.
Differential Voltage Swing
see Figure 1b.
VCC–1.545
Max
Units
VCC–0.895
V
VCC–1.295
V
150
400
mV
300
800
mV
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. ψJB uses 4-layer
θJA in still-air number unless otherwise stated.
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 lowers than 1.2V.
M9999-072810
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Precision Edge®
SY58033U
Micrel, Inc.
AC ELECTRICAL CHARACTERISTICs(7)
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50ý to VCC–2V; TA = –40°C to +85°C, unless otherwise stated.
Symbol
fMAX tpd tpd tempco Parameter
Maximum Operating Frequency
Propagation Delay Condition
VOUT ≥ 200mV
Min
Typ
Max
Units
Clock
5.5
GHz
(IN-to-Q)
130
200
280
ps
Differential Propagation Delay Temperature Coefficient
35
fs/°C
Output-to-Output Skew(within device)
tSKEW
Part-to-Part Skew
tJITTER
RMS Phase Jitter
Note 8
7
20
Note 9
100
Output = 622MHz Integration Range 12kHz - 20MHz 76
ps
ps
tr, tf
20% to 80%, at full output swing.
ps
Output Rise/Fall Time
20
50
80
fs
Notes:
7. High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50ý to VCC–2V, VIN ž 100mV.
8. Output-to-output skew is measured between outputs under identical conditions.
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. Part-to-part skew includes variation in tpd.
Phase noise
RMS Phase Jitter (Random)
12kHz to 20MHz = 76fs (Typical)
Phase Noise Plot: 622MHz @ 3.3V
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Precision Edge®
SY58033U
Micrel, Inc.
Single-Ended and Differential SwingS
VDIFF_IN,
VDIFF_OUT 800mV (Typ.)
VIN,
VOUT 400mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
Timing Diagram
/IN
VIN
IN
tPD
tPD
/Q
VOUT
Q
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Precision Edge®
SY58033U
Micrel, Inc.
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
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Precision Edge®
SY58033U
Micrel, Inc.
INPUT BUFFER
VCC
IN
50Ω
VT
GND
50Ω
/IN
Figure 2. Simplified Differential Input Buffer
INPUT INTERFACE APPLICATIONS
VCC
VCC
SY58033U
GND
/IN
/IN
SY58033U
NC
/IN
IN
CML
CML
NC
VCC
SY58033U
GND
VREF-AC
VREF-AC
VT
VCC
Figure 3b. AC-Coupled CML
Input Interface
VCC
VCC
VCC
IN
LVPECL
IN
/IN
LVDS
VREF-AC
For 3.3V, Rpd = 100Ω
For 2.5V, Rpd = 50Ω
/IN
SY58033U
Rpd
GND
VT
Rpd
For 2.5V, Rpd = 19Ω
For 3.3V, Rpd = 50Ω
Option: May connect VT to VCC .
GND
VREF-AC
VCC 0.01µF
VT
Figure 3a. DC-Coupled CML
Input Interface
Rpd
IN
LVPECL
IN
GND
VCC
VCC
VCC
VCC
VT
SY58033U
GND
NC
VREF-AC
NC
VT
VCC
Figure 3d. AC-Coupled LVPECL
Input Interface
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Figure 3e. LVDS
Input Interface
7
Figure 3c. LVPECL
Input Interface
Precision Edge®
SY58033U
Micrel, Inc.
LVPECL OUTPUT
LVPECL has high input impedance, and very low output
impedance (open emitter), and small signal swing which
results in low electromagnetic interference (EMI). LVPECL
is ideal for driving 50Ω and 100Ω controlled impedance
transmission lines. There are several techniques in
terminating the LVPECL output, which are the Parallel
Termination-Thevenin Equivalent, the Parallel Termination
(3-Resistor), and the AC-Coupled Termination. Unused
output pairs may be left floating. However, single-ended
outputs must be terminated, or balanced.
+3.3V
+3.3V
ZO = 50Ω
R1
130Ω
R1
130Ω
R2
82Ω
R2
82Ω
+3.3V
ZO = 50Ω
For +2.5V systems,
R1 = 250Ω, R2 = 62.5Ω
VT = VCC —2V
Figure 4. Parallel Termination-Thevenin Equivalent
+3.3V
+3.3V
Z = 50Ω
Z = 50Ω
source
50Ω
50Ω
Rb
destination
VCC
C1 (optional)
0.01µF
Notes:
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 V T.
4. For 2.5V systems, R b = 19Ω, For 3.3V systems, R b = 50Ω
Figure 5. Parallel Termination (3-Resistor)
RELATED MICREL PRODUCTS and support documentation
Part Number Function
Data Sheet Link
SY58031U
Ultra-Precision 1:8 Fanout Buffer with 400mV CML Outputs and Internal I/O Termination
http://www.micrel.com/product-info/products/sy58031u.shtml
SY58032U
Ultra-Precision 1:8 Fanout Buffer with LVPECL Outputs and Internal Termination
http://www.micrel.com/product-info/products/sy58032u.shtml
SY58033U
Ultra-Precision 1:8 Fanout Buffer with 400mV LVPECL Outputs and Internal Termination
http://www.micrel.com/product-info/products/sy58033u.shtml
32-MLF® Manufacturing Guidelines Exposed Pad
Application Note
www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
HBW Solutions
http://www.micrel.com/product-info/as/solutions.shtml
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[email protected] or (408) 955-1690
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Precision Edge®
SY58033U
Micrel, Inc.
32-pin MicroLeadFrame® (mlf-32)
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
VEE
VEE
MLF®
PCB Thermal Consideration for 32-Pin
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.
© 2005 Micrel, Incorporated.
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9