SY58028UMITR [MICREL]
ULTRA PRECISION DIFFERENTIAL CML 4:1 MUX WITH 1:2 FANOUT AND INTERNAL I/O TERMINATION; 超精密差分CML 4 ： 2扇出和内部I / O终止： 1 1 MUX
| 型号： | SY58028UMITR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | ULTRA PRECISION DIFFERENTIAL CML 4:1 MUX WITH 1:2 FANOUT AND INTERNAL I/O TERMINATION |
| 文件： | 总11页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
ULTRA PRECISION DIFFERENTIAL
CML 4:1 MUX WITH 1:2 FANOUT
AND INTERNAL I/O TERMINATION
®
Precision Edge
SY58028U
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- > 10.7Gbps data rate throughput
The SY58028U is a 2.5V/3.3V precision, high-speed, 4:1
differential CML multiplexer capable of handling clocks up
to 7GHz and data streams up to 10.7Gbps. In addition, a
1:2 fanout buffer provides two copies of the selected inputs.
• < 350ps IN-to-Out t
pd
• < 60ps t / t times
r
f
■ Ultra low-jitter design:
• < 10ps total jitter (clock)
PP
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 50Ω source terminated
CML, with extremely fast rise/fall times guaranteed to be less
than 60ps.
• < 1ps
random jitter
RMS
• < 10ps deterministic jitter
PP
• < 0.7ps
crosstalk-induced jitter
RMS
■ Unique patended input design minimizes crosstalk
■ Accepts an input signal as low as 100mV
■ Unique patended input termination and V pin
T
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
The SY58028U 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 LVPECL outputs, consider the SY58029U or
SY58030U Multiplexers. The SY58028U is part of Micrel’s
■ Internal 50Ω output source termination
■ 400mV CML output swing (R = 50Ω)
■ Power supply 2.5V ±5% or 3.3V ±10%
■ –40°C to +85°C temperature range
L
®
high-speed, Precision Edge product line.
®
All support documentation can be found on Micrel’s web
site at www.micrel.com.
■ Available in 32-pin (5mm × 5mm) MLF package
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
IN0
■ Redundant clock and/or data distribution
■ All SONET/SDH clock/data distribution
■ Loopback
50Ω
VT0
50Ω
4:1
/IN0
MUX
■ All Fibre Channel distribution
VREF-AC0
1:2
Fanout
0
■ All Gigabit Ethernet clock and/or data distribution
IN1
50Ω
TYPICAL PERFORMANCE
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 registered trademarks of Amkor Technology, Inc.
Rev.: C
Amendment: /0
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
1
Issue Date: February 2007
Precision Edge®
SY58028U
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
Package Operating
Package
Marking
Lead
Finish
Part Number
Type
Range
32 31 30 29 28 27 26 25
SY58028UMI
MLF-32
MLF-32
MLF-32
Industrial
Industrial
Industrial
SY58028U
SY58028U
Sn-Pb
Sn-Pb
1
24
23
GND
VCC
Q1
/Q1
VCC
NC
IN0
VT0
VREF-AC0
SY58028UMITR(2)
SY58028UMG(3)
2
3
4
5
6
7
22
21
20
19
18
SY58028U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
/IN0
IN1
VT1
SY58028UMGTR(2, 3) MLF-32
Industrial
SY58028Uwith
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.
®
3. Pb-Free package recommended for new designs.
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 Inputs: These inputs accept 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 pair is not used, connect
one input of the pair to ground through a 1kΩ resistor and the complement to VCC through a
825Ω resistor. Unused VT and VREF-AC may also be left open. 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 CML output pairs are copies of the selected input. Unused
output pairs may be left floating. See “Output Interface” section for termination 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 Applications” 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
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
2
Precision Edge®
SY58028U
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
CML Output Voltage (V
)........... V –1.0V to V +0.5V Ambient Temperature Range (T ) ............. –40°C to +85°C
CC CC
A
OUT
(3)
(4)
Termination Current
Package Thermal Resistance
®
MLF (θ
)
Source or sink current on V pin ........................ ±100mA
JA
T
Still-Air .............................................................35°C/W
Input Current
®
MLF (ψ
)
JB
Source or sink current on IN, /IN pin ....................±50mA
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Junction-to-Board ..............................................2°C/W
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
Typ
Max
Units
VCC
Power Supply Voltage
VCC = 2.5V
VCC = 3.3V
2.375
3.0
2.5
3.3
2.625
3.6
V
V
ICC
Power Supply Current
No load, max. VCC
120
100
50
150
120
mA
Ω
RDIFF_IN
Differential Input Resistance (IN-to-/IN)
Input Resistance (IN-to-VT, /IN-to-VT)
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
80
40
RIN
60
Ω
VIH
VCC–1.62
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 VCC–1.2 VCC–1.1
V
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.
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
3
Precision Edge®
SY58028U
Micrel, Inc.
(7)
CML OUTPUT DC ELECTRICAL CHARACTERISTICS
VCC = 2.5V ±5% or 3.3V ±10%; TA= -40°C to 85°C; RL = 100Ω across each output pair or equivalent; unless otherwise stated.
Symbol
VOH
Parameter
Condition
Min
VCC–0.020
325
Typ
Max
Units
V
Output HIGH Voltage
Output Voltage Swing
Differential Output Voltage Swing
Output Source Impedance
VCC
VOUT
See Figure 1a.
See Figure 1b.
400
800
50
mV
mV
Ω
VDIFF_OUT
650
ROUT
40
60
(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.
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
4
Precision Edge®
SY58028U
Micrel, Inc.
(8)
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, VIN ≥ 100mV unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
Gbps
GHz
ps
fMAX
Maximum Operating Frequency
NRZ Data 10.7
V
OUT ≥ 200mV
IN ≥ 100mV
Clock
170
7
tpd
Propagation Delay (Diff) (IN to Q)
(SEL to Q)
V
260
340
500
100
ps
t
pd Tempco
Differential Propagation Delay
Temperature Coefficient
115
7
fs/°C
tSKEW
Output-to-Output Note 9
Part-to-Part Note 10
20
50
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%, Full output swing
20
45
60
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–1
n
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 800mV (Typ.)
400mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
5
Precision Edge®
SY58028U
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
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
6
Precision Edge®
SY58028U
Micrel, Inc.
FUNCTIONAL CHARACTERISTICS
V
= 2.5V, GND = 0, V = 100mV, T = 25°C, unless otherwise stated.
CC
IN
A
200MHz Output
2GHz Output
TIME (70ps/div.)
TIME (600ps/div.)
7Gbps Output (223
—
1 PRBS)
TIME (50ps/div.)
10.7Gbps Output (223
—1 PRBS)
TIME (25ps/div.)
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
7
Precision Edge®
SY58028U
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 Swing
1.2
1
240
238
236
234
232
230
228
226
0.8
0.6
0.4
0.2
0
-40 -20
0
20 40 60 80 100
0
200 400 600 800 1000
INPUT VOLTAGE SWING (mV)
TEMPERATURE (°C)
Propagation Delay
vs. Temperature
Output Amplitude
vs. Frequency
248
246
244
242
240
238
236
234
232
230
228
500
450
400
350
300
250
200
150
100
50
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)
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
8
Precision Edge®
SY58028U
Micrel, Inc.
INPUT STAGE
VCC
IN
VT
50Ω
50Ω
GND
/IN
Figure 3. Simplified Differential Input Stage
INPUT INTERFACE APPLICATIONS
VCC
VCC
VCC
IN
LVPECL
/IN
IN
IN
SY58028U
CML
CML
/IN
/IN
GND
NC
VREF-AC
VT
SY58028U
SY58028U
VCC
VCC
0.01µF
GND
GND
Rpd
NC
NC
VREF-AC
VT
VREF-AC
VT
0.01µF
For a 3.3V system, Rpd = 50Ω
For a 2.5V system, Rpd = 19Ω
Figure 4a. DC-Coupled CML
Interface
Figure 4b. CML Interface
(AC-Coupled)
Figure 4c. DC-Coupled PECL
Interface
Option: May connect VT to VCC
VCC
VCC
IN
LVPECL
/IN
IN
Rpd
Rpd
SY58028U
LVDS
/IN
GND
VREF-AC
VT
SY58028U
GND
0.01µF
NC
NC
VREF-AC
VT
For a 3.3V system, Rpd = 100Ω
For a 2.5V system, Rpd = 50Ω
VCC
Figure 4d. AC-Coupled LVPECL
Interface
Figure 4f. LVDS
Interface
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
9
Precision Edge®
SY58028U
Micrel, Inc.
OUTPUT INTERFACE APPLICATIONS
VCC
VCC
SY58028U
50Ω
SY58028U
50Ω
50Ω
50Ω
ZO = 50Ω
ZO = 50Ω
50Ω
Q
Q
100Ω
50Ω
ZO = 50Ω
/Q
/Q
Z
O = 50Ω
DC bias
per application
16mA
16mA
GND
GND
Figure 5a. CML DC-Coupled
Figure 5b. CML AC-Coupled
(100Ω Termination)
(50Ω Termination)
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
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
10
Precision Edge®
SY58028U
Micrel, Inc.
®
32-PINMicroLeadFrame (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 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) 474-100 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.
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
11
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