SY58031UMGTR [MICREL]
ULTRA-PRECISION 1:8 CML FANOUT BUFFER WITH INTERNAL I/O TERMINATION; 超精密1：内部我8 CML扇出缓冲器/ O终端
| 型号： | SY58031UMGTR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | ULTRA-PRECISION 1:8 CML FANOUT BUFFER WITH INTERNAL I/O TERMINATION |
| 文件： | 总8页 (文件大小：610K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
ULTRA-PRECISION 1:8
CML FANOUT BUFFER WITH
INTERNAL I/O TERMINATION
Precision Edge®
SY58031U
FEATURES
■ Precision 1:8, 400mV CML fanout buffer
®
Precision Edge
■ Guaranteed AC performance over temperature and
voltage:
DESCRIPTION
• Clock frequency range: DC to >6GHz
• <60ps t / t time
• <270ps t
r
f
The SY58031U is a 2.5V/3.3V precision, high-speed, fully
differential CML 1:8 fanout buffer. The SY58031U is
optimized to provide eight identical output copies with less
pd
• <20ps ouput-to-output skew
■ Low-jitter performance:
• <10ps total jitter (clock)
than 20ps of skew and less than 10ps total jitter. It can
process clock signals as fast as 6GHz.
PP
PP
• <1ps
• <1ps
random jitter
cycle-to-cycle jitter
RMS
RMS
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the SY58031U to directly
interface to CML, LVPECL, 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 CML outputs
feature 400mV typical swing into 50Ω loads and provide an
extremely fast rise/fall time guaranteed to be less than 60ps.
■ 50Ω source-terminated CML outputs
■ 400mV CML output swing into 50Ω load
■ Fully differential I/O
■ Accepts an input signal as low as 100mV
■ Unique, patent-pending input termination and VT pin
accepts DC-coupled and AC-coupled differential
inputs: (LVPECL, LVDS, and CML)
The SY58031U 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 high-speed 1:8 LVPECL fanout buffers, consider
the SY58032U and SY58033U. The SY58031U is part of
■ Power supply 2.5V ±5% or 3.3V ±10%
■ Industrial temperature range: –40°C to +85°C
®
■ Available in 32-pin (5mm × 5mm) MLF package
®
Micrel’s high-speed, 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
Q0
/Q0
Q1
/Q1
■ High-end, low-skew multiprocessor synchronous
clock distribution
Q2
/Q2
IN
50Ω
50Ω
Q3
VT
/Q3
/IN
Q4
/Q4
VREF-AC
Q5
/Q5
Q6
/Q6
Q7
/Q7
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
Rev.: C
Amendment: /0
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
1
Issue Date: February 2007
Precision Edge®
SY58031U
Micrel, Inc
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
Package Operating
Range
Package
Marking
Lead
Finish
Part Number
Type
32 31 30 29 28 27 26 25
1
24
23
GND
VCC
Q3
/Q3
Q4
/Q4
VCC
GND
VCC
GND
IN
SY58031UMI
MLF-32
MLF-32
MLF-32
Industiral
Industrial
Industiral
SY58031U
SY58031U
Sn-Pb
Sn-Pb
2
3
4
5
6
7
SY58031UMITR(2)
SY58031UMG(3)
22
21
20
19
18
VT
VREF-AC
/IN
SY58031U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
GND
VCC
SY58031UMGTR(2, 3)
MLF-32
Industrial
SY58031U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
8
17
9
10 11 12 13 14 15 16
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.
®
32-Pin MLF (MLF-32)
PIN DESCRIPTION
Pin Number
Pin Name
Pin Function
3, 6
IN, /IN
VT
Differential Signal Input: Each pin of this pair internally terminates with 50Ω to the VT
pin. Note that this input will default to an indeterminate state if left open.
See “Input Interface Applications” section.
4
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
GND,
Exposed Pad
Ground. Exposed pad must be connected to a ground plane that is the same potential
as the ground pin.
1, 8, 9, 16
18, 23, 25, 32
VCC
Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors as close to the
pins as possible.
31, 30, 29, 28, 27, Q0, /Q0, Q1, /Q1, CML Differential Output Pairs: Differential buffered output copy of the input
26, 22, 21, 20, 19, Q2, /Q2, Q3, /Q3, signal. The CML output swing is typically 400mV into 50Ω. Unused output pairs may be
15, 14, 13, 12,
11, 10
Q4, /Q4, Q5, /Q5, left floating with no impact on jitter. See “CML Output Termination” section.
Q6, /Q6, Q7, /Q7
5
VREF-AC
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 0.01µF capacitor to VCC. Maximum sink/source current is 0.5mA.
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
2
Precision Edge®
SY58031U
Micrel, Inc.
Absolute Maximum Ratings(1)
Power Supply Voltage (V ) ...................... –0.5V to +4.0V
Operating Ratings(2)
Power Supply Voltage (V ) ................. +2.375V to +3.60V
CC
Input Voltage (V ) ......................................... –0.5V to V
CC
Ambient Temperature Range (T ) ............. –40°C to +85°C
CC
IN
A
(4)
Current (V )
Package Thermal Resistance
T
®
MLF (θ )
JA
Source or sink current on V pin ........................ ±100mA
Input Current (V )
T
Still-Air .............................................................35°C/W
T
®
Source or sink current on IN, /IN ..........................±50mA
MLF (ψ )
JB
Junction-to-Board ............................................20°C/W
Current (V )
Source or sink current on V
REF
(3)
REF-AC
....................... ±1.5mA
Lead Temperature Soldering, (20 sec.) .................... 260°C
Storage Temperature Range (T ) ........... –65°C to +150°C
S
(5)
DC ELECTRICAL CHARACTERISTICS
TA= –40°C to +85°C
Symbol
Parameter
Condition
Min
Typ
Max
Units
VCC
Power Supply Voltage
2.5V nominal
3.3V nominal
2.375
3.0
2.5
3.3
2.625
3.6
V
V
ICC
Power Supply Current
VCC = max. no lead. Includes current
265
330
mA
through 50Ω pull-ups.
VIH
Input HIGH Voltage
Input LOW Voltage
Input Voltage Swing
IN1, /IN1
VCC–1.2
VCC
VIH–0.1
1.7
V
V
V
V
VIL
IN1, /IN1
0
VIN
IN1, /IN1, see Figure 1a.
IN1, /IN1, see Figure 1b.
0.1
0.2
VDIFF_IN
Differential Input Voltage Swing
|IN0, /IN0|, |IN1, /IN1|
RIN
In-to-VT Resistance
40
50
60
Ω
V
V
VT
Max. In-to-VT (IN, /IN)
1.28
IN
VREF-AC
VCC–1.3 VCC–1.2 VCC–1.1
(5)
CML DC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; RL = 100Ω across Q and /Q; TA= –40°C to +85°C, unless otherwise stated.
Symbol
VOH
Parameter
Condition
Min
VCC–0.020
325
Typ
Max
Units
V
Output HIGH Voltage
Output Voltage Swing
Differential Voltage Swing
Output Source Impedance
VCC
VOUT
see Figure 1a.
see Figure 1b.
400
800
50
mV
mV
Ω
VDIFF_OUT
ROUT
650
40
60
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. ψ uses 4-layer
JB
θ
in still-air number unless otherwise stated.
JA
5. The circuit is designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established.
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
3
Precision Edge®
SY58031U
Micrel, Inc
(7)
AC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; RL = 100Ω across each output pair or equivalent; TA = –40°C to +85°C, unless otherwise stated.
Symbol
fMAX
Parameter
Condition
Min
6
Typ
Max
Units
GHz
ps
Maximum Operating Frequency
VOUT ≥ 200mV
Clock
tpd
Propagation Delay
(IN-to-Q)
120
230
35
270
tpd tempco
Differential Propagation Delay
Temperature Coefficient
fs/°C
tSKEW
Output-to-Output (Within Device)
Part-to-Part
Note 8
Note 9
7
20
100
1
ps
ps
tJITTER
Clock
Cycle-to-Cycle Note 10
Total Jitter (Clock) Note 11
Random Jitter (RJ) Note 12
Output Rise/Fall Time 20% to 80%, at full output swing
psRMS
psPP
psRMS
ps
10
1
tr, tf
20
45
60
Notes:
7. High frequency AC electricals are guaranteed by design and characterization. All outputs loaded, V ≥100mV.
IN
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. Part-to-part skew includes variation in t
.
pd
10. Cycle-to-cycle jitter definition: The variation of periods between adjacent cycles, T
signal.
T
n– n–1
where T is the time between rising edges of the output
12
11. Total jitter definition: With an ideal clock input of frequency ≤ f
, no more than one output edge in 10 output edges will deviate by more than the
MAX
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
VDIFF_IN
VDIFF_OUT 800mV (Typ.)
,
VIN,
VOUT
400mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
TIMING DIAGRAM
/IN
IN
VIN
tpd
tpd
/Q
Q
VOUT
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
4
Precision Edge®
SY58031U
Micrel, Inc.
TYPICAL OPERATING CHARACTERISTICS
V
= 2.5V, GND = 0, V = 100mV, T = 25°C, unless otherwise stated.
IN A
CC
200MHz Output
2.5GHz Output
TIME (50ps/div.)
TIME (600ps/div.)
7GHz Output
TIME (20ps/div.)
Output-to-Output Skew
vs. Temperature
Amplitude
vs. Frequency
∆
4.0
500
450
400
350
300
250
200
150
100
50
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
VIN = 200mV
0
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
FREQUENCY (MHz)
Propagation Delay
vs. Temperature
Propagation Delay
vs. Input Swing
195
190
185
180
175
202
200
198
196
194
192
190
188
186
184
182
180
VIN = 400mV
-40 -20
0
20 40 60 80 100 120
100 200 300 400 500 600 700 800
TEMPERATURE (°C)
INPUT SWING (mV)
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
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Precision Edge®
SY58031U
Micrel, Inc
INPUT BUFFER
VCC
IN
VT
50Ω
50Ω
GND
/IN
Figure 2. Simplified Differential Input Buffer
INPUT INTERFACE APPLICATIONS
VCC
VCC
VCC
VCC
VCC
VCC
IN
IN
/IN
CML
LVPECL
/IN
IN
SY58031U
VREF-AC
VT
CML
GND
SY58031U
/IN
GND
GND
VCC
NC
NC
VREF-AC
VT
VCC
SY58031U
0.01µF
0.01µF
VREF-AC
VT
Rpd
For 2.5V, Rpd = 19Ω
For 3.3V, Rpd = 50Ω
Option: May connect VT to VCC
.
Figure 3a. DC-Coupled CML
Input Interface
Figure 3b. AC-Coupled CML
Input Interface
Figure 3c. LVPECL
Input Interface
VCC
VCC
VCC
VCC
IN
LVPECL
IN
/IN
LVDS
Rpd
GND
Rpd
SY58031U
/IN
VT
SY58031U
GND
NC
NC
VREF-AC
VT
GND
VREF-AC
For 3.3V, Rpd = 100Ω
For 2.5V, Rpd = 50Ω
VCC
Figure 3d. AC-Coupled LVPECL
Input Interface
Figure 3e. LVDS
Input Interface
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
6
Precision Edge®
SY58031U
Micrel, Inc.
CML OUTPUT TERMINATION
Figure 4 and Figure 5 illustrate how to terminate a CML All outputs of the SY58031U are 50Ω with a 16mA current
output using both the AC- and DC-coupled configuration. source.
VCC
VCC
SY58031U
50Ω
SY58031U
50Ω
50Ω
50Ω
ZO = 50Ω
ZO = 50Ω
100Ω
Q
Q
50Ω
50Ω
/Q
/Q
ZO = 50Ω
ZO = 50Ω DC bias
per application
16mA
16mA
GND
GND
Figure 4. CML DC-Coupled Termination
Figure 5. CML AC-Coupled Termination
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number
Function
Data Sheet Link
SY58031U
Ultra-Precision 1:8 CML Fanout Buffer with
Internal I/O Termination
http://www.micrel.com/product-info/products/sy58031u.shtml
SY58032U
SY58033U
Ultra-Precision 1:8 LVPECL Fanout Buffer with
Internal Termination
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.pdf
http://www.micrel.com/product-info/as/solutions.shtml
Ultra-Precision 1:8 400mV Fanout Buffer with
Internal Termination
32-MLF® Manufacturing Guidelines Exposed Pad
Application Note
HBW Solutions
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
7
Precision Edge®
SY58031U
Micrel, Inc
®
32-PIN MicroLeadFrame (MLF-32)
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heat Dissipation
VEE
Heavy Copper Plane
Heavy Copper Plane
®
VEE
PCB Thermal Consideration for 32-Pin MLF 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.
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
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