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Micrel, Inc.
ULTRA PRECISION DIFFERENTIAL CML 4:1 MUX WITH 1:2 FANOUT AND INTERNAL I/O TERMINATION
Precision Edge SY58028U
Precision Edge(R) SY58028U (R)
FEATURES
s Selects 1 of 4 differential inputs s Provides two copies of the selected input s Guaranteed AC performance over temperature and voltage: * DC-to- > 10.7Gbps data rate throughput * < 350ps IN-to-Out tpd * < 60ps tr / tf times s Ultra low-jitter design: * < 10psPP total jitter (clock) * < 1psRMS random jitter * < 10psPP deterministic jitter * < 0.7psRMS crosstalk-induced jitter s Unique patended input design minimizes crosstalk s Accepts an input signal as low as 100mV s Unique patended input termination and VT pin accepts DC- and AC-coupled inputs (CML, LVPECL, LVDS) s Internal 50 output source termination s 400mV CML output swing (RL = 50) s Power supply 2.5V 5% or 3.3V 10% s -40C to +85C temperature range s Available in 32-pin (5mm x 5mm) MLF(R) package Precision Edge(R)
DESCRIPTION
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. 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 50 source terminated CML, with extremely fast rise/fall times guaranteed to be less than 60ps. 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 -40C to +85C. For applications that require LVPECL outputs, consider the SY58029U or SY58030U Multiplexers. The SY58028U is part of Micrel's high-speed, Precision Edge(R) product line. All support documentation can be found on Micrel's web site at www.micrel.com.
APPLICATIONS
s s s s s Redundant clock and/or data distribution All SONET/SDH clock/data distribution Loopback All Fibre Channel distribution All Gigabit Ethernet clock and/or data distribution
FUNCTIONAL BLOCK DIAGRAM
IN0 50 VT0 50 /IN0 VREF-AC0 0 IN1 50 VT1 50 /IN1 VREF-AC1 IN2 50 2 1 MUX 4:1 MUX 1:2 Fanout
TYPICAL PERFORMANCE
3.2Gbps Output (2
23
Q0 /Q0
1 PRBS)
Q1 /Q1
Output Swing
(100mV/div.)
VT2 50 /IN2 VREF-AC2 IN3 50 VT3 50 /IN3
TIME (100ps/div.)
3
VREF-AC3 SEL0 (CMOS/TTL) SEL1 (CMOS/TTL)
Rev.: C Amendment: /0
Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-020207 hbwhelp@micrel.com or (408) 955-1690
1
Issue Date: February 2007
Micrel, Inc.
Precision Edge(R) SY58028U
PACKAGE/ORDERING INFORMATION
/IN3 VREF-AC3 VT3 IN3 /IN2 VREF-AC2 VT2 IN2
Ordering Information(1)
Part Number
GND VCC Q1 /Q1 VCC NC SEL1 VCC
Package Type MLF-32 MLF-32 MLF-32 MLF-32
Operating Range Industrial Industrial Industrial Industrial
Package Marking SY58028U SY58028U SY58028U with Pb-Free bar-line indicator SY58028Uwith Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
32 31 30 29 28 27 26 25
SY58028UMI SY58028UMITR(2) SY58028UMG(3) SY58028UMGTR(2, 3)
IN0 VT0 VREF-AC0 /IN0 IN1 VT1 VREF-AC1 /IN1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
24 23 22 21 20 19 18 17
32-Pin MLF(R) (MLF-32)
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC electricals only. 2. Tape and Reel. 3. Pb-Free package recommended for new designs.
PIN DESCRIPTION
Pin Number 1, 4 5, 8 25, 28 29, 32 Pin Name IN0, /IN0 IN1, /IN1 IN2, /IN2 IN3, /IN3 Pin Function 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 50. 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 1k resistor and the complement to VCC through a 825 resistor. Unused VT and VREF-AC may also be left open. Please refer to the "Input Interface Applications" section for more details. 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. This single-ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note that this input is internally connected to a 25k 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. No Connect. Positive Power Supply: Bypass with 0.1F0.01F low ESR capacitors. 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. Ground. Ground pin and exposed pad must be connected to the same ground plane. 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 0.01F low ESR capacitor to VCC. See "Input Interface Applications" section. Maximum sink/source current is 0.5mA.
2, 6, 26, 30
15, 18
14, 19 10, 13, 16 17, 20, 23 11, 12 21, 22 9, 24 3, 7, 27, 31
TRUTH TABLE
SEL1 0 0 1 1 SEL0 0 1 0 1 IN0 Input Selected IN1 Input Selected IN2 Input Selected IN3 Input Selected
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GND VCC /Q0 Q0 VCC NC SEL0 VCC
VT0, VT1 VT2, VT3 SEL0, SEL1
NC VCC /Q0, Q0 /Q1, Q1 GND, Exposed Pad VREF-AC0 VREF-AC1 VREF-AC2 VREF-AC3
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Micrel, Inc.
Precision Edge(R) SY58028U
Absolute Maximum Ratings(1)
Power Supply Voltage (VCC ) ...................... -0.5V to +4.0V Input Voltage (VIN) ......................................... -0.5V to VCC CML Output Voltage (VOUT) ........... VCC-1.0V to VCC+0.5V Termination Current(3) Source or sink current on VT pin ........................ 100mA Input Current Source or sink current on IN, /IN pin .................... 50mA Lead Temperature (soldering, 20 sec.) ..................... 260C Storage Temperature Range (TS ) ........... -65C to +150C
Operating Ratings(2)
Power Supply Voltage (VCC) ............... +2.375V to +2.625V ............................................................ +3.0V to +3.6V Ambient Temperature Range (TA) ............. -40C to +85C Package Thermal Resistance(4) MLF(R) (JA) Still-Air ............................................................. 35C/W MLF(R) (JB) Junction-to-Board .............................................. 2C/W
DC ELECTRICAL CHARACTERISTICS(5)
TA= -40C to 85C, unless otherwise stated. Symbol VCC ICC RDIFF_IN RIN VIH VIL VIN VDIFF_IN VT IN VREF-AC
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. 4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential (GND) on the PCB. JB uses 4-layer JA 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.
Parameter Power Supply Voltage Power Supply Current 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
Condition VCC = 2.5V VCC = 3.3V No load, max. VCC
Min 2.375 3.0
Typ 2.5 3.3 120
Max 2.625 3.6 150 120 60 VCC VIH-0.1 1.7
Units V V mA V V V mV
80 40 VCC-1.62 0 See Figure 1a. See Figure 1b. 0.1 200
100 50
1.28 VCC-1.3 VCC-1.2 VCC-1.1
V V
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Micrel, Inc.
Precision Edge(R) SY58028U
CML OUTPUT DC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V 5% or 3.3V 10%; TA= -40C to 85C; RL = 100 across each output pair or equivalent; unless otherwise stated. Symbol VOH VOUT VDIFF_OUT ROUT Parameter Output HIGH Voltage Output Voltage Swing Differential Output Voltage Swing Output Source Impedance See Figure 1a. See Figure 1b. Condition Min VCC-0.020 325 650 40 400 800 50 60 Typ Max VCC Units V mV mV
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V 5% or 3.3V 10%; TA= -40C to +85C, unless otherwise stated. Symbol VIH VIL IIH IIL
Note: 7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current
Condition SEL0, SEL1 SEL0, SEL1
Min 2.0
Typ
Max
Units V
0.8 40 -300
V A A
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Micrel, Inc.
Precision Edge(R) SY58028U
AC ELECTRICAL CHARACTERISTICS(8)
VCC = 2.5V 5% or 3.3V 10%; RL = 100 across each output pair, or equivalent; TA= -40C to +85C, VIN 100mV unless otherwise stated. Symbol fMAX tpd tpd Tempco tSKEW Parameter Maximum Operating Frequency VOUT 200mV Propagation Delay (Diff) (IN to Q) (SEL to Q) Differential Propagation Delay Temperature Coefficient Output-to-Output Part-to-Part tJITTER Data Random Jitter Deterministic Jitter Clock Cycle-to-Cycle Jitter Total Jitter Crosstalk Induced Jitter (Adjacent Channel) tr, tf
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. 12. Deterministic jitter is measured at 2.5Gbps to 3.2Gbps, with both K28.5 and 223-1 PRBS pattern. 13. Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, Tn-Tn-1 where T is the time between rising edges of the output signal. 14. Total jitter definition: with an ideal clock input of frequency fMAX, no more than one output edge in 1012 output edges will deviate by more than the 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.
Condition NRZ Data Clock VIN 100mV
Min 10.7
Typ
Max
Units Gbps
7 170 100 115 260 340 500
GHz ps ps fs/C 20 50 ps ps psRMS psPP psRMS psPP psRMS ps
Note 9 Note 10 Note 11 Note 12 Note 13 Note 14 Note 15 20% to 80%, Full output swing 20 2.5Gbps to 3.2Gbps 2.5Gbps to 3.2Gbps
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1 10 1 10 0.7 45 60
Output Rise/Fall Time
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VIN, VOUT 400mV (Typ.)
VDIFF_IN, VDIFF_OUT 800mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
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Micrel, Inc.
Precision Edge(R) SY58028U
TIMING DIAGRAMS
IN VIN /IN tpd Q VOUT /Q tpd
Figure 2a. IN-to-Q Timing Diagram
VCC/2 SEL tpd Q
VCC/2 tpd
VOUT /Q
Figure 2b. SEL-to-Q Timing Diagram
SEL0 Q: or: SEL1 Q: or:
SEL1 = LOW; SEL1 = HIGH; SEL0 = LOW; SEL0 = HIGH;
IN0, /IN1 = LOW; IN2, /IN3 = LOW; IN0, /IN2 = LOW; IN1, /IN3 = LOW;
/IN0, IN1 = HIGH /IN2, IN3 = HIGH /IN0, IN2 = HIGH /IN1, IN3 = HIGH
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Micrel, Inc.
Precision Edge(R) SY58028U
FUNCTIONAL CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25C, unless otherwise stated.
200MHz Output
2GHz Output
Output Swing (100mV/div.)
Output Swing (100mV/div.)
TIME (70ps/div.) TIME (600ps/div.)
2.5Gbps Output (2
23
1 PRBS)
7Gbps Output (223--1 PRBS)
Output Swing
Output Swing (100mV/div.)
(100mV/div.)
TIME (100ps/div.)
TIME (50ps/div.)
10.7Gbps Output (223--1 PRBS)
Output Swing (100mV/div.)
TIME (25ps/div.)
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Micrel, Inc.
Precision Edge(R) SY58028U
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25C, unless otherwise stated.
240 PROPAGATION DELAY (ps) 238 236 234 232 230 228 226 0
OUTPUT-to-OUTPUT SKEW (ps)
Propagation Delay vs. Input Voltage Swing
1.2 1 0.8 0.6 0.4 0.2
Output-to-Output Skew vs. Temperature
200
400
600
800
1000
0 -40 -20
0
20
40
60
80 100
INPUT VOLTAGE SWING (mV)
TEMPERATURE (C)
248 246 244 242 240 238 236 234 232 230 228 -60 -40 -20 0
Propagation Delay vs. Temperature
OUTPUT AMPLITUDE (mV)
20 40 60 80 100
500 450 400 350 300 250 200 150 100 50 0 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (GHz)
Output Amplitude vs. Frequency
PROPAGATION DELAY (ps)
TEMPERATURE (C)
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Micrel, Inc.
Precision Edge(R) SY58028U
INPUT STAGE
VCC
IN 50 VT GND 50 /IN
Figure 3. Simplified Differential Input Stage
INPUT INTERFACE APPLICATIONS
VCC
VCC
VCC
LVPECL
IN /IN SY58028U GND
SY58028U VREF-AC VT
IN CML /IN SY58028U GND NC NC VREF-AC VT GND 0.01F VCC CML
IN /IN
NC
VREF-AC VT
VCC 0.01F Rpd
For a 3.3V system, Rpd = 50 For a 2.5V system, Rpd = 19
Figure 4a. DC-Coupled CML Interface
Option: May connect VT to VCC
VCC
Figure 4b. CML Interface (AC-Coupled)
Figure 4c. DC-Coupled PECL Interface
IN
LVPECL
VCC
/IN Rpd GND Rpd SY58028U VREF-AC VT 0.01F VCC For a 3.3V system, Rpd = 100 For a 2.5V system, Rpd = 50
IN LVDS /IN SY58028U GND NC NC VREF-AC VT
Figure 4d. AC-Coupled LVPECL Interface
Figure 4f. LVDS Interface
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Micrel, Inc.
Precision Edge(R) SY58028U
OUTPUT INTERFACE APPLICATIONS
VCC SY58028U 50 50 Q ZO = 50 VCC SY58028U 50 50 Q ZO = 50 50 100 /Q ZO = 50 /Q 50 ZO = 50 DC bias per application
16mA
16mA
GND
GND
Figure 5a. CML DC-Coupled (100 Termination)
Figure 5b. CML AC-Coupled (50 Termination)
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number SY58028U SY58029U SY58030U Function Ultra Precision Differential CML 4:1 MUX with 1:2 Fanout and Internal I/O Termination Ultra Precision Differential LVPECL 4:1 MUX with 1:2 Fanout and Internal Termination Ultra Precision, 400mV Differential LVPECL 4:1 MUX with 1:2 Fanout and Internal Termination MLF(R) Application Note HBW Solutions New Products and Applications Data Sheet Link http://www.micrel.com/product-info/products/sy58028u.shtml http://www.micrel.com/product-info/products/sy58029u.shtml http://www.micrel.com/product-info/products/sy58030u.shtml www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf www.micrel.com/product-info/products/solutions.shtml
M9999-020207 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
Precision Edge(R) SY58028U
32-PINMicroLeadFrame(R) (MLF-32)
Package EP- Exposed Pad
Die
CompSide Island
Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane
PCB Thermal Consideration for 32-Pin MLF(R) 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
TEL
USA
+ 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. (c) 2005 Micrel, Incorporated. M9999-020207 hbwhelp@micrel.com or (408) 955-1690
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