SY58028U [MICREL]
ULTRA PRECISION DIFFERENTIAL LVPECL 4:1 MUX with 1:2 FANOUT and INTERNAL TERMINATION; 超精密差分LVPECL 4 ： 1 MUX 1 ： 2扇出和内部终端
| 型号： | SY58028U |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | ULTRA PRECISION DIFFERENTIAL LVPECL 4:1 MUX with 1:2 FANOUT and INTERNAL TERMINATION |
| 文件： | 总11页 (文件大小：201K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
ULTRA PRECISION DIFFERENTIAL
LVPECL 4:1 MUX with 1:2 FANOUT
and INTERNAL TERMINATION
®
Precision Edge
SY58029U
FEATURES
■ Selects 1 of 4 differential inputs
®
Precision Edge
■ Provides two copies of the selected input
■ Guaranteed AC performance over temperature and
DESCRIPTION
voltage:
• DC-to-> 5Gbps data rate throughput
The SY58029U is a 2.5V/3.3V precision, high-speed, 4:1
differential multiplexer with 100k LVPECL (800mV)
compatible outputs, capable of handling clocks up to 4GHz
and data streams up to 5Gbps. In addition, a 1:2 fanout
buffer provides two copies of the selected inputs.
• < 390ps IN-to-Out t
pd
• < 110ps t / t times
r
f
■ Ultra low-jitter design:
• < 10ps total jitter (clock)
PP
• < 1ps
• < 10ps deterministic jitter
• < 0.7ps
random jitter
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows customers to interface
to any differential signal (AC- or DC-coupled) as small as
100mV without any level shifting or termination resistor
networks in the signal path. The result is a clean, stub-free,
low-jitter interface solution. The outputs are 800mV LVPECL,
(100k temperature compensated) with extremely fast rise/
fall times guaranteed to be less than 110ps.
RMS
PP
crosstalk-induced jitter
RMS
■ Unique patended input design minimizes crosstalk
■ Accepts an input signal as low as 100mV
■ Unique patented input termination and V pin
T
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
The SY58029U operates from a 2.5V ±5% supply or a
3.3V ±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. For applications that
require CML outputs, consider the SY58028U. For 400mV
LVPECL outputs, consider the SY58030U. The SY58029U
■ 800mV 100K LVPECL output swing
■ Power supply 2.5V ±5% or 3.3V ±10%
■ –40°C to +85°C temperature range
®
is part of Micrel’s high-speed, Precision Edge product line.
■ Available in 32-pin (5mm × 5mm) MLF™ package
All support documentation can be found on Micrel’s web
site at www.micrel.com.
APPLICATIONS
FUNCTIONAL BLOCK DIAGRAM
■ Redundant clock and/or distribution
■ All SONET/SDH clock/data distribution
■ Loopback
IN0
50Ω
VT0
■ All Fibre Channel distribution
50Ω
4:1
MUX
/IN0
■ All Gigabit Ethernet clock and/or data distribution
VREF-AC0
1:2
Fanout
0
IN1
TYPICAL PERFORMANCE
50Ω
VT1
Q0
50Ω
/Q0
/IN1
1
2
VREF-AC1
MUX
IN2
VT2
Q1
50Ω
50Ω
/Q1
/IN2
3
VREF-AC2
IN3
VT3
50Ω
50Ω
/IN3
VREF-AC3
SEL0 (CMOS/TTL)
SEL1 (CMOS/TTL)
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Rev.: B
Amendment: /0
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
1
Issue Date: May 2005
Precision Edge®
SY58029U
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
Package
Type
Operating
Range
Package
Marking
Lead
Finish
Part Number
32 31 30 29 28 27 26 25
SY58029UMI
SY58029UMITR(2)
MLF-32
MLF-32
MLF-32
Industrial
Industrial
Industrial
SY58029U
SY58029U
Sn-Pb
Sn-Pb
1
24
23
GND
VCC
Q1
/Q1
VCC
NC
IN0
VT0
VREF-AC0
2
3
4
5
6
7
22
21
20
19
18
SY58029UMG
SY58029U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
/IN0
IN1
VT1
SY58029UMGTR(2)
MLF-32
Industrial
SY58029U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
VREF-AC1
/IN1
SEL1
VCC
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)
PIN DESCRIPTION
Pin Number
Pin Name
Pin Function
1, 4
5, 8
25, 28
29, 32
IN0, /IN0
IN1, /IN1
IN2, /IN2
IN3, /IN3
Differential Input: Each pair accepts AC- or DC-coupled signals as small as 100mV.
Each pin of a pair internally terminates to a VT pin through 50Ω. Note that these
inputs will default to an indeterminate state if left open. If an input is not used, connect one
end of the differential pairs to ground through a 1kΩ resistor, and leave the other end to
VCC through a 825Ω resistor. Unused VT and VREF-AC pins may also be left floating.
Please refer to the “Input Interface Applications” section for more details.
2, 6, 26, 30
15, 18
VT0, VT1
VT2, VT3
Input Termination Center-Tap: Each side of the differential input pair terminates to a VT
pin. The VT pin provides a center-tap to the termination network for maximum
interface flexibility. See “Input Interface Applications” section for more details.
SEL0, SEL1
This Single-Ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note
that this input is internally connected to a 25kΩ pull-up resistor and will default to a logic
HIGH state if left open. Input logic threshold is VCC/2. See “Truth Table” for select control.
14, 19
NC
No Connect.
10, 13, 16
17, 20, 23
VCC
Positive Power Supply: Bypass with 0.1µF 0.01µF low ESR capacitors.
11, 12
21, 22
/Q0, Q0
/Q1, Q1
Differential Outputs: These 100k compatible (internally temperature compensated)
LVPECL output pairs are copies of the selected input. Unused output pins may be left
floating. See “Output Interface” for terminating guidelines.
9, 24
GND,
Ground. Ground pin and exposed pad must be connected to the same ground plane.
Exposed Pad
3, 7, 27, 31
VREF-AC0
VREF-AC1
VREF-AC2
VREF-AC3
Reference Voltage: This reference output is equivalent to VCC–1.4V. It is used for
AC-coupled inputs. When interfacing to AC input signals, connect VREF-AC directly to the
VT pin and bypass with 0.01µF low ESR capacitor to VCC. See “Input Interface Applica-
tions” section. Maximum sink/source current is 0.5mA.
TRUTH TABLE
SEL1
SEL0
0
0
1
1
0
IN0 Input Selected
IN1 Input Selected
IN2 Input Selected
IN3 Input Selected
1
0
1
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
2
Precision Edge®
SY58029U
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(2)
Power Supply Voltage (V ) ...................... –0.5V to +4.0V
Power Supply Voltage (V ) ............... +2.375V to +2.625V
CC
CC
Input Voltage (V ) ......................................... –0.5V to V
............................................................ +3.0V to +3.6V
IN
CC
LVPECL Output Current (I
)
Ambient Temperature Range (T ) ............. –40°C to +85°C
OUT
A
(4)
Continuous .............................................................50mA
Surge....................................................................100mA
Package Thermal Resistance
MLF™ (θ
)
JA
(3)
Termination Current
Still-Air .............................................................50°C/W
MLF™ (ψ
)
Source or sink current on V pin ........................ ±100mA
JB
T
Junction-to-Board ............................................20°C/W
Input Current
Source or sink current on IN, /IN pin ....................±50mA
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, unless otherwise stated.
Symbol
Parameter
Condition
Min
2.375
3.0
Typ
2.5
3.3
110
100
50
Max
2.625
3.6
Units
V
VCC
Power Supply Voltage
VCC = 2.5V
VCC = 3.3V
V
ICC
Power Supply Current
No load, max. VCC
140
mA
Ω
RDIFF_IN
Differential Input Resistance (IN-to-/IN)
80
40
120
RIN
Input Resistance (IN-to-/IN, /IN-to-V )
60
Ω
T
VIH
Input HIGH Voltage (IN-to-/IN)
Input LOW Voltage (IN-to-/IN)
Input Voltage Swing (IN-to-/IN)
Differential Input Voltage Swing (IN-to-/IN)
Max Input Voltage (IN-to-VT)
Reference Voltage
Note 6
VCC–1.6
0
VCC
VIH–0.1
1.7
V
VIL
V
VIN
See Figure 1a.
See Figure 1b.
0.1
V
VDIFF_IN
200
mV
V
VT IN
1.28
VREF-AC
VCC–1.3
V
–1.2 VCC–1.1
V
CC
Notes:
1. Permanent device damage may occur if ratings in the “Absolute Maximum Ratings” section 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.
ψ
4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential (GND) on the PCB.
in still air number unless otherwise stated.
uses 4-layer
JB
θ
JA
5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
6. (min), not lower than 1.2V.
V
IH
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
3
Precision Edge®
SY58029U
Micrel, Inc.
(7)
LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C; RL = 50Ω to VCC –2V across each output pair, unless otherwise stated.
Symbol
VOH
Parameter
Condition
Min
VCC–1.145
VCC–1.945
550
Typ
Max
Units
V
Output HIGH Voltage
Output LOW Voltage
Output Voltage Swing
Differential Output Voltage Swing
VCC–0.895
VCC–1.695
VOL
V
VOUT
See Figure 1a.
See Figure 1b.
800
mV
mV
VDIFF_OUT
1100
1600
(7)
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C, unless otherwise stated.
Symbol
VIH
Parameter
Condition
Min
Typ
Max
Units
V
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
SEL0, SEL1
SEL0, SEL1
2.0
VIL
0.8
40
V
IIH
µA
µA
IIL
–300
Note:
7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
4
Precision Edge®
SY58029U
Micrel, Inc.
(8)
AC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA= –40°C to +85°C, VIN ≥ 100mV, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
Gbps
GHz
ps
fMAX
Maximum Operating Frequency
NRZ Data
Clock
5
V
OUT ≥ 400mV
IN ≥ 100mV
4
tpd
Propagation Delay (Diff) (IN-to-Q)
(SEL-to-Q)
V
215
100
390
500
ps
tpd Tempco
tSKEW
Differential Propagation Delay
Temperature Coefficient
115
7
fs/°C
Output-to-Output Note 9
Part-to-Part Note 10
15
100
1
ps
ps
tJITTER
Data
Random Jitter Note 11
Deterministic Jitter Note 12
Cycle-to-Cycle Jitter Note 13
Total Jitter Note 14
2.5Gbps to 3.2Gbps
2.5Gbps to 3.2Gbps
psRMS
psPP
psRMS
psPP
psRMS
10
1
Clock
10
0.7
Crosstalk Induced Jitter
(Adjacent Channel)
Note 15
tr, tf
Output Rise/Fall Time
20% to 80%, VIN = 800mV, full output swing
35
60
110
ps
Notes:
8. High frequency AC electricals are guaranteed by design and characterization.
9. Output-to-output skew is measured between outputs under identical input conditions.
10. 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.
11. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps to 3.2Gbps.
23
12. Deterministic jitter is measured at 2.5Gbps to 3.2Gbps, with both K28.5 and 2 –1 PRBS pattern.
13. Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, T –T
where T is the time between rising edges of the output
n
n–1
signal.
12
14. 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.
15. Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs.
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VDIFF_IN
,
VIN,
VOUT
VDIFF_OUT 1.6V (Typ.)
800mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
5
Precision Edge®
SY58029U
Micrel, Inc.
TIMING DIAGRAMS
IN
VIN
/IN
tpd
tpd
Q
VOUT
/Q
Figure 2a. IN-to-Q Timing Diagram
VCC/2
tpd
VCC/2
tpd
SEL
Q
VOUT
/Q
Figure 2b. SEL-to-Q Timing Diagram
SEL0 Q:
SEL1 Q:
SEL1 = LOW;
SEL1 = HIGH;
IN0, /IN1 = LOW;
IN2, /IN3 = LOW;
/IN0, IN1 = HIGH
/IN2, IN3 = HIGH
or:
or:
SEL0 = LOW;
SEL0 = HIGH;
IN0, /IN2 = LOW;
IN1, /IN3 = LOW;
/IN0, IN2 = HIGH
/IN1, IN3 = HIGH
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
6
Precision Edge®
SY58029U
Micrel, Inc.
FUNCTIONAL CHARACTERISTICS
V
= 2.5V, GND = 0, V = 100mV, T = 25°C, unless otherwise stated.
CC
IN
A
200MHz Output
1.25GHz Output
TIME (600ps/div.)
TIME (100ps/div.)
1.25Gbps Output (223
—1 PRBS)
2.5GHz Output
TIME (50ps/div.)
TIME (200ps/div.)
3.2Gbps Output (223 –1 PRBS)
5Gbps Output (223
—1 PRBS)
TIME (50ps/div.)
TIME (100ps/div.)
M9999-051105
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Precision Edge®
SY58029U
Micrel, Inc.
TYPICAL OPERATING CHARACTERISTICS
V
= 2.5V, GND = 0, V = 100mV, T = 25°C, unless otherwise stated.
CC
IN
A
Output-to-Output Skew
vs. Temperature
Propagation Delay
vs. Input Voltage
1.4
1.2
1
320
315
310
305
300
295
290
285
280
0.8
0.6
0.4
0.2
0
-40 -20
0
20 40 60 80 100
0
200 400 600 800 1000 1200
INPUT VOLTAGE (mV)
TEMPERATURE (°C)
Output Amplitude
vs. Frequency
Propagation Delay
vs. Temperature
310
308
306
304
302
300
298
296
800
700
600
500
400
300
200
100
0
-60 -40 -20
0
20 40 60 80 100
0 1 2 3 4 5 6 7 8 9 10
TEMPERATURE (°C)
FREQUENCY (GHz)
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
8
Precision Edge®
SY58029U
Micrel, Inc.
INPUT STAGE
VCC
IN
VT
50Ω
50Ω
GND
/IN
Figure 3. Simplified Differential Input Stage
INPUT INTERFACE APPLICATIONS
VCC
IN
/IN
LVPECL
VCC
VCC
SY58029U
IN
IN
CML
GND
VCC
CML
NC
VREF-AC
VT
/IN
/IN
SY58029U
SY58029U
0.01µF
Rpd
GND
VCC
GND
VREF-AC
VT
NC
NC
VREF-AC
VT
For a 3.3V system, Rpd = 50Ω
For a 2.5V system, Rpd = 19Ω
0.01µF
Figure 4b. CML
Figure 4a. CML
Figure 4c. PECL
Interface (AC-coupled)
Interface (DC-coupled)
Option: May connect VT to VCC
Interface (DC-coupled)
VCC
IN
VCC
PECL
/IN
IN
Rpd
Rpd
SY58029U
LVDS
/IN
GND
VCC
VREF-AC
VT
GND
SY58029U
0.01µF
GND
For a 3.3V system, Rpd = 100Ω
For a 2.5V system, Rpd = 50Ω
NC
NC
VREF-AC
VT
Figure 4d. LVPECL
Interface (AC-coupled)
Figure 4e. LVDS Interface
9
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
Precision Edge®
SY58029U
Micrel, Inc.
OUTPUT INTERFACE APPLICATIONS
+3.3V
+3.3V
+3.3V
Z = 50Ω
Z = 50Ω
R1
130Ω
R1
130Ω
+3.3V
+3.3V
ZO = 50Ω
ZO = 50Ω
50Ω
50Ω
destination
R2
82Ω
R2
82Ω
VCC
50Ω
R
b
C1
0.01µF
(optional)
Figure 5a. Parallel Thevenin-Equivalent
Termination
Figure 5b. Parallel Termination
(Three-Resistor "Y")
Note:
Note:
1. For a 2.5V system, Rb = 19Ω.
For a 3.3V system, Rb = 50Ω.
1. For a 2.5V system, R1 = 250Ω, R2 = 62.5Ω.
For a 3.3V system, R1 = 130Ω, R2 = 82Ω.
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number
Function
Data Sheet Link
SY58028U
Ultra Precision Differential CML 4:1 MUX
with 1:2 Fanout and Internal I/O Termination
http://www.micrel.com/product-info/products/sy58028u.shtml
SY58029U
SY58030U
Ultra Precision Differential LVPECL 4:1 MUX
with 1:2 Fanout and Internal Termination
http://www.micrel.com/product-info/products/sy58029u.shtml
Ultra Precision, 400mV Differential LVPECL 4:1 http://www.micrel.com/product-info/products/sy58030u.shtml
MUX with 1:2 Fanout and Internal Termination
MLF™ Application Note
www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
www.micrel.com/product-info/products/solutions.shtml
HBW Solutions New Products and Applications
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
10
Precision Edge®
SY58029U
Micrel, Inc.
32 LEAD 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.
M9999-051105
hbwhelp@micrel.com or (408) 955-1690
11
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