SY58032UMG [MICREL]
ULTRA-PRECISION 1:8 FANOUT vBUFFER WITH LVPECL OUTPUTS AND INTERNAL TERMINATION; 超精密1 ： 8扇出与LVPECL输出和内部终止vBUFFER
| 型号： | SY58032UMG |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | ULTRA-PRECISION 1:8 FANOUT vBUFFER WITH LVPECL OUTPUTS AND INTERNAL TERMINATION |
| 文件： | 总8页 (文件大小：526K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
ULTRA-PRECISION 1:8 FANOUT
BUFFER WITH LVPECL OUTPUTS
AND INTERNAL TERMINATION
®
Precision Edge
SY58032U
FEATURES
■ Precision 1:8, LVPECL fanout buffer
®
Precision Edge
■ Guaranteed AC performance over temperature and
voltage:
DESCRIPTION
• Clock frequency range: DC to 4GHz
• <110ps t / t times
• <330ps t
r
f
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
pd
• <20ps 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 4GHz.
pp
PP
• <1ps
random jitter
RMS
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 50Ω loads, and provide an extremely fast rise/fall
time guaranteed to be less than 110ps.
■ 100k LVPECL compatible outputs
■ Fully differential inputs/outputs
■ Accepts an input signal as low as 100mV
■ Unique input termination and V pin accepts DC-
T
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
The SY58032U 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 a higher high-speed 1:8 fanout buffer, consider the
SY58031U or SY58033U. The SY58032U is part of Micrel’s
®
■ Available in 32-pin (5mm × 5mm) MLF package
®
high-speed, Precision Edge product line.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
■ All SONET and all GigE clock distribution
■ All Fibre Channel clock and data distribution
■ Network routing engine timing distribution
Q0
/Q0
Q1
■ High-end, low-skew multiprocessor synchronous
clock distribution
/Q1
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.: D
Amendment: /0
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
1
Issue Date: February 2007
Precision Edge®
SY58032U
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
Package
Type
Operating
Range
Package
Marking
Lead
Finish
32 31 30 29 28 27 26 25
Part Number
1
24
23
GND
VCC
Q3
/Q3
Q4
/Q4
VCC
GND
VCC
GND
IN
SY58032UMI
MLF-32
MLF-32
MLF-32
Industrial
Industrial
Industrial
SY58032U
SY58032U
Sn-Pb
Sn-Pb
2
3
4
5
6
7
22
21
20
19
18
SY58032UMITR(2)
SY58032UMG(3)
VT
VREF-AC
/IN
SY58032U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
GND
VCC
SY58032UMGTR(2, 3) MLF-32
Industrial
SY58032U 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.
®
32-Pin MLF (MLF-32)
3. Pb-Free package recommended for new designs.
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, 100k LVPECL Differential Output Pairs: Differential buffered output copy of the
26, 22, 21, 20, 19, Q2, /Q2, Q3, /Q3, input signal. The LVPECL output swing is typically 800mV into 50Ω. Unused output pairs
15, 14, 13, 12,
11, 10
Q4, /Q4, Q5, /Q5, may be left floating with no impact on jitter. See “LVPECL Output” 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®
SY58032U
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 load. Includes current
190
250
mA
through 50Ω pull-ups.
VIH
Input HIGH Voltage
Input LOW Voltage
Input Voltage Swing
IN, /IN
VCC–1.2
VCC
VIH–0.1
1.7
V
V
V
V
VIL
IN, /IN
0
VIN
IN, /IN, see Figure 1a.
IN, /IN, 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 IN
Max. In-to-VT (IN, /IN)
1.28
VREF-AC
VCC–1.3 VCC–1.2 VCC–1.1
(5)
LVPECL DC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated.
Symbol
VOH
Parameter
Condition
Min
VCC–1.145
VCC–1.945
500
Typ
Max
Units
V
Output HIGH Voltage
Output LOW Voltage
Output Voltage Swing
Differential Voltage Swing
VCC–0.895
VCC–1.695
VOL
V
VOUT
see Figure 1a.
see Figure 1b.
800
mV
mV
VDIFF_OUT
1000
1600
2000
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®
SY58032U
Micrel, Inc.
(7)
AC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated.
Symbol
fMAX
Parameter
Condition
Min
4
Typ
Max
Units
GHz
ps
Maximum Operating Frequency
VOUT ≥ 400mV
Clock
tpd
Propagation Delay
(IN-to-Q)
180
260
35
330
tpd tempco
Differential Propagation Delay
Temperature Coefficient
fs/°C
tSKEW
Output-to-Output Skew (within Device) Note 8
Part-to-Part Skew Note 9
Clock
7
20
100
1
ps
ps
tJITTER
Cycle-to-Cycle Jitter Note 10
Total Jitter (Clock) Note 11
Random Jitter (RJ) Note 12
psRMS
psPP
psRMS
ps
10
1
tr, tf
Output Rise/Fall Time
20% to 80%, at full output swing.
35
75
110
Notes:
7. High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50Ω to V – 2V, V ≥ 100mV.
CC
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 –T
signal.
where T is the time between rising edges of the output
n
n–1
12
11. Total jitter definition: with an ideal clock input of frequency ≤ f
specified peak-to-peak jitter value.
, no more than one output edge in 10 output edges will deviate by more than the
MAX
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 1.6V (Typ.)
,
VIN,
800mV (Typ.)
VOUT
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®
SY58032U
Micrel, Inc.
TYPICAL OPERATING CHARACTERISTICS
V
= 2.5V, GND = 0, V = 100mV, T = 25°C, unless otherwise stated.
IN A
CC
200MHz Output
1.25GHz Output
TIME (600ps/div.)
TIME (100ps/div.)
4GHz Output
TIME (30ps/div.)
∆
Amplitude
vs. Frequency
Output-to-Output Skew
vs. Temperature
2.5
900
800
700
600
500
400
300
200
100
0
2
1.5
1
0.5
VIN = 400mV
0
-60 -40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
FREQUENCY (MHz)
Propagation Delay
vs. Temperature
Propagation Delay
vs. Input Swing
265
260
255
250
245
240
235
230
235.5
235
VIN = 800mV
234.5
234
233.5
233
232.5
232
231.5
0
200 400 600 800 1000
INPUT SWING (mV)
-60 -40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
5
Precision Edge®
SY58032U
Micrel, Inc.
INPUT BUFFER
VCC
IN
VT
50Ω
50Ω
GND
/IN
Figure 2. Simplified Differential Input Buffer
INPUT INTERFACE APPLICATIONS
VCC
VCC
IN
VCC
VCC
VCC
VCC
LVPECL
/IN
IN
IN
SY58032U
VREF-AC
VT
CML
GND
CML
/IN
GND
VCC
/IN
VCC
SY58032U
SY58032U
0.01µF
0.01µF
GND
Rpd
VREF-AC
VT
NC
NC
VREF-AC
VT
For 2.5V, Rpd = 19Ω
For 3.3V, Rpd = 50Ω
Figure 3b. AC-Coupled CML
Input Interface
Figure 3c. LVPECL
Input Interface
Figure 3a. DC-Coupled CML
Input Interface
Option: May connect V to V
.
T
CC
VCC
VCC
VCC
VCC
IN
LVPECL
IN
/IN
LVDS
Rpd
Rpd
SY58032U
VREF-AC
VT
/IN
GND
SY58032U
GND
NC
NC
VREF-AC
VT
GND
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®
SY58032U
Micrel, Inc.
LVPECL OUTPUT
LVPECL has high input impedance, and very low output output: Parallel Termination-Thevenin Equivalent, Parallel
impedance (open emitter), and small signal swing which Termination (3-resistor), and AC-coupled Termination.
results in low EMI. LVPECL is ideal for driving 50Ω and Unused output pairs may be left floating. However, single-
100Ω controlled impedance transmission lines. There are ended outputs must be terminated, or balanced.
several techniques for terminating the LVPECL
+3.3V
R1
130Ω
R1
130Ω
+3.3V
+3.3V
ZO = 50Ω
ZO = 50Ω
R2
82Ω
R2
82Ω
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
50Ω
50Ω
“destination”
VCC
“source”
R
b
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 VT.
4. For 2.5V systems, Rb = 19Ω, For 3.3V systems, Rb = 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
SY58033U
Ultra-Precision 1:8 Fanout Buffer with LVPECL
Outputs and 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_0902.pdf
http://www.micrel.com/product-info/as/solutions.shtml
Ultra-Precision 1:8 Fanout Buffer with 400mV LVPECL
Outputs and Internal Termination
32-MLF® Manufacturing Guidelines Exposed Pad
Application Note
HBW Solutions
M9999-020707
hbwhelp@micrel.com or (408) 955-1690
7
Precision Edge®
SY58032U
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
8
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