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Micrel, Inc.
ULTRA-LOW JITTER 2 x 2 CROSSPOINT SWITCH w/CML OUTPUTS AND INTERNAL I/O TERMINATION
Precision Edge SY58023U
Precision Edge(R) SY58023U (R)
FEATURES
s Guaranteed AC performance over temperature and voltage: * >10.7Gbps data throughput * <60ps tr/tf times * <285ps tpd (IN-to-Q) * <20ps skew s Low jitter: * <10pspp total jitter (clock) * <1psrms random jitter (data) * <10pspp deterministic jitter (data) s Crosstalk induced jitter: <0.7psrms s Accepts an input signal as low as 100mV s Unique input termination and VT pin accepts DCcoupled and AC-coupled differential inputs: LVPECL, LVDS, and CML s 50 source terminated CML outputs s Fully differential inputs/outputs s Power supply 2.5V 5% and 3.3V 10% s Industrial -40C to +85C temperature range s Available in 16-pin (3mm x 3mm) MLF(R) package Precision Edge(R)
DESCRIPTION
The SY58023U is a 2.5V/3.3V precision, high-speed, fully differential CML 2 x 2 crosspoint switch. The SY58023U is optimized to provide two identical output copies with less than 20ps of skew and ultra-low jitter. It can route clock signals as fast as 6GHz or data up to 10.7Gbps. The differential input includes Micrel's unique, 3-pin input termination architecture that allows the SY58023U to directly interface to LVPECL, LVDS, and CML differential signals (AC- or DC-coupled) as small as 100mV (200mVpp) without any level-shifting or termination resistor networks in the signal path. The CML outputs features 400mV typical swing into 50 loads, and provide an extremely fast rise/fall time guaranteed to be less than 60ps. The SY58023U operates from a +2.5V 5% supply or +3.3V 10% supply and is guaranteed over the full industrial temperature range (-40C to +85C). For applications that require high speed dual CML switches, consider the SY58024U. The SY58023U is part of Micrel's high-speed, Precision Edge(R) product line. Datasheets and support documentation can be found on Micrel's website at www.micrel.com.
APPLICATIONS
s s s s s Gigabit Ethernet data/clock routing SONET data/clocking routing Switch fabric clock routing Redundant switchover Backplane redundancy
FUNCTIONAL BLOCK DIAGRAM
SEL0 (TTL/CMOS) IN0 50 VT0 50 /IN0
0
Q0
1
/Q0
SEL1 (TTL/CMOS) IN1 50 VT1 50 /IN1
0
Q1
/Q1 1
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
Rev.: F Amendment: /0
1
Issue Date: February 2007
Micrel, Inc.
Precision Edge(R) SY58023U
PACKAGE/ORDERING INFORMATION
SEL0 GND VCC VT0
Ordering Information(1)
Part Number
12 11 10 9
16
15
14
13
Package Type MLF-16 MLF-16 MLF-16 MLF-16
Operating Range Industrial Industrial Industrial Industrial
Package Marking 023U 023U 023U with Pb-Free bar-line indicator 023U with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
IN0 /IN0 /IN1 IN1
1 2 3 4 5 6 7 8
Q0 /Q0 /Q1 Q1
SY58023UMI SY58023UMITR(2) SY58023UMG(3) SY58023UMGTR(2, 3)
SEL1
VT1
GND
VCC
16-Pin MLF(R) (MLF-16)
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, 2, 3, 4 16, 5 Pin Name IN0, /IN0, /IN1, IN1 VT0, VT1 Pin Function Differential Signal Input: Each pin of this pair internally terminates with 50 to the VT pin. Note that this input will default to an indeterminate state if left open. See "Input Interface Applications" section. Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a center-tap for each input (IN, /IN) to a termination network for maximum interface flexibility. See "Input Interface Applications" section. Select Input: TTL/CMOS select input control that selects inputs IN0, or IN1. Note that this input is internally connected to a 25k pull-up resistor and will default to a logic High state if left open. Ground. Exposed pad must be connected to a ground plane that is the same potential as the device ground pin. Positive Power Supply: Bypass with 0.1F0.01F low ESR capacitors as close to the pins as possible. CML Differential Output Pairs: Differential buffered output copy of the selected input signal. The CML output swing is typically 400mV across 100. Unused output pairs may be left floating with no impact on jitter. See "CML Output Termination" section.
15, 6
SEL0, SEL1
7, 14 8, 13 12, 11, 10, 9
GND, (Exposed Pad) VCC Q0, /Q0, /Q1, Q1
TRUTH TABLE
SEL0 L L H H SEL1 L H L H Q0 IN0 IN0 IN1 IN1 Q1 IN0 IN1 IN0 IN1
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2
Micrel, Inc.
Precision Edge(R) SY58023U
Absolute Maximum Ratings(1)
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 Current (VT) Source or Sink Current on VT pin ................... 100mA Input Current (VT) Source or Sink Current on IN, /IN ..................... 50mA Lead Temperature (soldering, 20 sec.) ..................... 260C Storage Temperature (TS) ........................... -65C +150C
Operating Ratings(2)
Supply Voltage (VCC) ............................ +2.375V to +3.60V Ambient Temperature (TA) ......................... -40C to +85C Package Thermal Resistance(3) MLF(R) (JA) Still-Air ............................................................. 60C/W 500lfpm ............................................................ 54C/W MLF(R) (JB) Junction-to-board ............................................ 38C/W
DC ELECTRICAL CHARACTERISTICS(4)
TA = -40C to +85C. Symbol VCC ICC VIH VIL VIN VDIFF_IN RIN IN to VT Parameter Power Supply Voltage Power Supply Current Input HIGH Voltage Input LOW Voltage Input Voltage Swing Differential Input Swing IN-to-VT Resistance Condition 2.5V nominal 3.3V nominal VCC = max., current through internal 50 source termination resistor included. IN, /IN IN, /IN IN, /IN; see Figure 1a. IN, /IN; see Figure 1b. VCC -1.2 0 0.1 0.2 40 50 60 1.28 Min 2.375 3.0 Typ 2.5 3.3 100 Max 2.625 3.60 130 VCC VIH -0.1 1.7 Units V V mA V V V V V
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(4)
VCC = 2.5V 5% or 3.3V 10%; TA= -40C to 85C Symbol VIH VIL IIH IIL
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 for 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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential (GND) on the PCB. JA uses 4-layer in still-air, unless otherwise stated. 4. 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
Min 2.0
Typ
Max
Units V
0.8 40 -300
V A A
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Micrel, Inc.
Precision Edge(R) SY58023U
CML OUTPUT DC ELECTRICAL CHARACTERISTICS(6)
VCC = +3.3V 10% or +2.5V 5%; RL = 100 across each output pair; TA = -40C to +85C, unless otherwise stated. Symbol VOH VOUT VDIFF_OUT ROUT
Notes: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established
Parameter Output HIGH Voltage Output Voltage Swing Differential Voltage Swing Output Source Impedance
Condition Q0, /Q0; Q1, /Q1 Q0, /Q0; Q1, /Q1; see Figure 1a. Q0, /Q0; Q1, /Q1; see Figure 1b. Q0, /Q0; Q1, /Q1
Min VCC-0.020 325 650 40
Typ
Max VCC
Units V mV mV
400 800 50
500 1000 60
AC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V 5% or 3.3V 10%; RL = 100 across each output pair; TA = -40C to +85C, unless otherwise stated. Symbol fMAX tpd tSKEW Parameter Maximum Operating Frequency Condition VIN 100mV; VOUT 200mV IN-to-Q SEL-to-Q Channel-to-Channel Skew (Within Bank) Part-to-Part Skew tJITTER Clock Data Cycle-to-Cycle Jitter Total Jitter Random Jitter Deterministic Jitter Crosstalk Induced Jitter (Adjacent Channel) tr, tf
Notes: 7. 8. 9. Measured with 100mV input swing. High frequency AC-parameters are guaranteed by design and characterization. Skew is measured between outputs of the same bank under identical transitions. 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.
Min Clock NRZ Data 6 10.7 135 100
Typ
Max
Units GHz Gbps
Propagation Delay
285 400 20 75 1 10 1 10 0.7
ps ps ps ps psRMS psPP psRMS psPP psRMS ps
Note 8 Note 9 Note 10 Note 11 Note 12 Note 13 Note 14 20% to 80%, at full swing. 25
Output Rise/Fall Time
60
10. 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. 11. 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. 12. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps-3.2Gbps. 13. Deterministic jitter is measured at 2.5Gbps-3.2Gbps with both K28.5 and 223-1 PRBS pattern. 14. Crosstalk induced jitter is defined as the added jitter that results from signals applied to two adjacent channels. It is measured at the output while applying similar, differential clock frequencies that are asynchronous with respect to each other at inputs.
M9999-020207 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
Precision Edge(R) SY58023U
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VIN, VOUT
Typ. 400mV
VDIFF_IN, VDIFF_OUT (Typ. 800mV)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
TIMING DIAGRAM
/IN IN /Q Q tpd tpd VOUT = 400mV (typ.) (50 load) VOUT = 400mV (typ.) (50 load)
Figure 2a. AC Timing Diagram IN-to-Q
VCC/2 SEL /Q Q IN0, /IN1 = LOW, /IN0, IN1 = HIGH tpd
VCC/2 tpd VOUT = 400mV (typ.) (50 load)
Figure 2b. AC Timing Diagram SEL-to-Q
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Micrel, Inc.
Precision Edge(R) SY58023U
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, VIN = 100mV, TA = 25C, unless otherwise noted.
AMPLITUDE (mV)
400 350 300 250 200 150 100 50 0 0 2000 4000 6000 8000 10000 FREQUENCY (MHz)
PROPAGATION DELAY (ps)
500 450
Frequency vs. Amplitude
Propagation Delay vs. Temperature
205 204 203 202 201 200 199 198 197 196 195 -60 -40 -20 0 20 40 60 80 100
TEMPERATURE (C)
215
Propagation Delay vs. Input Voltage Swing
3.5 3 AMPLITUDE (mV) 2.5 2 1.5 1 0.5
Within Device Skew vs. Temperature
PROPAGATION DELAY (ps)
210 205 200 195 190 185 180 175 0 200 400 600 800 1000 1200 INPUT VOLTAGE SWING (mV)
0 -60 -40 -20 0
20 40 60 80 100
TEMPERATURE (C)
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Micrel, Inc.
Precision Edge(R) SY58023U
FUNCTIONAL CHARACTERISTICS
VCC = 2.5V, VIN = 100mV, TA = 25C, unless otherwise noted.
5Gbps Output 223--1 PRBS
Amplitude (100mV/div.) Amplitude (100mV/div.)
2.5GHz Output
TIME (50ps/div.)
TIME (50ps/div.)
1.25GHz Output
200MHz Output
Amplitude (100mV/div.)
TIME (100ps/div.)
Amplitude (100mV/div.)
TIME (600ps/div.)
M9999-020207 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
Precision Edge(R) SY58023U
INPUT STAGE
VCC
IN 50 VT GND 50 /IN
Figure 3. Simplified Differential Input Buffer
INPUT INTERFACE APPLICATIONS
VCC VCC
VCC VCC
VCC
VCC
IN CML /IN SY58023U NC VT
IN CML /IN SY58023U
IN
LVPECL
/IN SY58023U
R1 0.01F V T R2 For 2.5V, R1 = 1k, R2 = 1.1k. For 3.3V, R1 = 649, R2 = 1k.
0.01F Rpd
VT
Option: may connect VT to VCC.
For VCC = 2.5V, Rpd = 19. For VCC = 3.3V, Rpd = 50.
Figure 4a. DC-Coupled CML Input Interface
VCC VCC
Figure 4b. AC-Coupled CML Input Interface
Figure 4c. DC-Coupled LVPECL Input Interface
IN
LVPECL
VCC
VCC
/IN SY58023U Rpd Rpd R1 0.01F
IN LVDS /IN
VT
SY58023U
R2
NC
For VCC = 2.5V, Rpd = 50, R1 = 1k, R2 = 1.1k . For VCC = 3.3V, Rpd = 100, R1 = 649, R2 = 1k .
VT
Figure 4d. AC-Coupled LVPECL Input Interface
Figure 4e. LVDS Input Interface
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Micrel, Inc.
Precision Edge(R) SY58023U
CML OUTPUT TERMINATION
Figures 5 and Figure 6 illustrates how to terminate a CML output using both the AC-coupled and DC-coupled configuration. All outputs of the SY58023U are 50 with a 16mA current source.
VCC
VCC
50
50 50 Q 100 /Q
50
Q 50 50 /Q
DC-bias per application
16mA
16mA GND
GND
Figure 5. CML DC-Coupled Termination
Figure 6. CML AC-Coupled Termination
RELATED PRODUCT AND SUPPORT DOCUMENTATION
Part Number SY58023U SY58024U Function Ultra-low Jitter 2x2 Crosspoint Switch w/CML Outputs and Internal I/O Termination Ultra-low Jitter Dual 2x2 Crosspoint Switch w/CML Outputs and Internal I/O Termination 16-MLF(R) Manufactering Guidelines Exposed Pad Application Note HBW Solutions Data Sheet Link http://www.micrel.com/product-info/products/sy58023u.shtml http://www.micrel.com/product-info/products/sy58024u.shtml www.amkor.com/products/notes_papers/MLF_AppNote.pdf http://www.micrel.com/product-info/as/solutions.shtml
M9999-020207 hbwhelp@micrel.com or (408) 955-1690
9
Micrel, Inc.
Precision Edge(R) SY58023U
16-PIN MicroLeadFrame(R) (MLF-16)
Package EP- Exposed Pad
Die
CompSide Island
Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane
PCB Thermal Consideration for 16-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 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
TEL
USA
+ 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. (c) 2005 Micrel, Incorporated. M9999-020207 hbwhelp@micrel.com or (408) 955-1690
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