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Micrel, Inc.
2.5V ULTRA-PRECISION 1:4 LVDS FANOUT BUFFER/TRANSLATOR WITH INTERNAL TERMINATION
Precision Edge(R) SY89832U Precision Edge(R)
SY89832U
FEATURES
s Guaranteed AC performance over temperature and voltage: * DC-to >2.0GHz throughput * <570ps propagation delay (IN-to-Q) * <20ps within-device skew * <200ps rise/fall time s Ultra-low jitter design: * <1psRMS cycle-to-cycle jitter * <1psRMS random jitter * <10psPP deterministic jitter * <10psPP total jitter (clock) s Unique, patent-pending input termination and VT pin accepts DC- and AC-coupled inputs s High-speed LVDS outputs s 2.5V voltage supply operation s Industrial temperature range: -40C to +85C s Available in 16-pin (3mm x 3mm) MLFTM package Precision Edge(R)
DESCRIPTION
The SY89832U is a 2.5V, high-speed, 2GHz differential LVDS (Low Voltage Differential Swing) 1:4 fanout buffer optimized for ultra-low skew applications. Within device skew is guaranteed to be less than 20ps over supply voltage and temperature. The differential input buffer has a unique internal termination design that allows access to the termination network through a VT pin. This feature allows the device to easily interface to different logic standards. A VREF-AC reference output is included for AC-coupled applications. The SY89832U is a part of Micrel's high-speed clock synchronization family. For 3.3V applications, see SY89833L. For applications that require a different I/O combination, consult Micrel's website at www.micrel.com, and choose from a comprehensive product line of high-speed, low-skew fanout buffers, translators and clock generators.
APPLICATIONS
s s s s Processor clock distribution SONET clock distribution Fibre Channel clock distribution Gigabit Ethernet clock distribution
FUNCTIONAL BLOCK DIAGRAM
1:4
TYPICAL PERFORMANCE
622MHz Output
Q0 /Q0
Q1
IN VT /IN 50 50
/Q1
Q2 /Q2
D Q
VREF-AC EN (LVTTL/CMOS)
Q3 /Q3
TIME (200ps/div.)
Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. September 2005
Output Swing (75mV/div.)
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Micrel, Inc.
Precision Edge(R) SY89832U
PACKAGE/ORDERING INFORMATION
VCC GND /Q0 Q0
Ordering Information(1)
12 11 10 9
16
15
14
13
Q1 /Q1 Q2 /Q2
1 2 3 4 5 6 7 8
IN VT VREF-AC /IN
Part Number SY89832UMI SY89832UMITR(2) SY89832UMG(3) SY89832UMGTR(2, 3)
Package Type MLF-16 MLF-16 MLF-16 MLF-16
Operating Range Industrial Industrial Industrial Industrial
Package Marking 832U 832U 832U with Pb-Free bar line indicator 832U with Pb-Free bar line indicator
Lead Finish Sn-Pb Sn-Pb NiPdAu Pb-Free NiPdAu Pb-Free
/Q3
Q3
VCC
EN
16-Pin MLFTM (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 is recommended for new designs.
PIN DESCRIPTION
Pin Number 15, 16 1, 2 3, 4 5, 6 8 Pin Name Q0, /Q0 Q1, /Q1 Q2, /Q2 Q3, /Q3 EN Pin Function LVDS Differential (Outputs): Normally terminated with 100 across the pair (Q, /Q). See "LVDS Outputs" section, Figure 2a. Unused outputs should be terminated with a 100 resistor across each pair. This single-ended TTL/CMOS-compatible input functions as a synchronous output enable. The synchronous enable ensures that enable/disable will only occur when the outputs are in a logic LOW state. Note that this input is internally connected to a 25k pull-up resistor and will default to logic HIGH state (enabled) if left open. Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs accept AC- or DC-Coupled differential signs 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 intermediate state if left open. Pleae refer to the "Input Interface Applications" section for more details. Reference Voltage: These outputs bias to VCC-1.4V. They are used when AC coupling the inputs (IN, /IN). For AC-Coupled applications, connect VREF-AC to VT pin and bypass with 0.01F low ESR capacitor to VCC. See "Input Interface Applications" section for more details. Maximum sink/source current is 1.5mA. Due to the limited drive capability, each VREF-AC pin is only intended to drive its respective VT pin. Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT pins provide a center-tap to a termination network for maximum interface flexibility. See "Input Interface Applications" section for more detaiils. Ground. GND pins and exposed pad must be connected to the most negative potential of the device ground. Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitors and place as close to each VCC pin as possible.
9, 12
/IN, IN
10
VREF-AC
11
VT
13 7, 14
GND VCC
TRUTH TABLE
IN 0 1 X
Note 1.
/IN 1 0 X
EN 1 1 0
Q 0 1 0(1)
/Q 1 0 1(1)
On next negative transition of the input signal (IN). M9999-092005 hbwhelp@micrel.com or (408) 955-1690
September 2005
2
Micrel, Inc.
Precision Edge(R) SY89832U
Absolute Maximum Ratings(1)
Supply Voltage (VCC) .................................. -0.5V to +4.0V Input Voltage (VIN) ............................... -0.5V to VCC +0.3V LVDS Output Current (IOUT) .................................... 10mA Input Current Source or Sink Current on (IN, /IN) .................. 50mA VREF-AC Current Source or Sink Current on (IVT) .......................... 2mA Lead Temperature (soldering, 20sec.) ...................... 260C Storage Temperature (TS) ....................... -65C to +150C
Operating Ratings(2)
Supply Voltage Range .......................... +2.375V to 2.625V Ambient Temperature (TA) ......................... -40C to +85C Package Thermal Resistance(3) MLFTM (JA) Still-Air ........................................................ 60C/W (JB) .................................................................... 32C/W
DC ELECTRICAL CHARACTERISTICS(4)
TA = -40C to +85C, unless otherwise stated. Symbol VCC ICC RIN RDIFF-IN VIH VIL VIN VDIFF_IN VREF-AC Parameter Power Supply Power Supply Current Input Resistance (IN-to-VT) Differential Input Resistance (IN-to-/IN) Input HIGH Voltage (IN, /IN) Input LOW Voltage (IN, /IN) Input Voltage Swing (IN, /IN) Differential Input Voltage Swing |IN - /IN| Output Reference Voltage see Figure 2c. see Figure 2d. Note 5 No load, max. VCC. 45 80 VCC-1.6 0 0.1 0.2 VCC-1.525 VCC-1.425 VCC-1.325 Condition Min 2.375 Typ 2.5 75 50 100 Max 2.625 100 55 120 VCC VIH -0.1 1.7 Units V mA V V V V V
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 ratlng 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. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB. JB and JA values are determined for a 4-layer board in stil-air number, unless otherrwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 5. VIH (min) not lower than 1.2V.
September 2005
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Micrel, Inc.
Precision Edge(R) SY89832U
LVDS OUTPUTS DC ELECTRICAL CHARACTERISTICS(6)
VCC = 2.5V 5%, RL = 100 across the outputs; TA = -40C to +85C Symbol VOUT VDIFF_OUT VOCM VOCM Parameter Output Voltage Swing Differential Output Voltage Swing Output Common Mode Voltage Change in Common Mode Voltage Condition See Figure 2c. See Figure 2d. Min 250 500 1.125 -50 Typ 325 650 1.275 50 Max Units mV mV V mV
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(6)
VCC = 2.5V 5%, TA = -40C to +85C Symbol VIH VIL IIH IIL Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Condition Min 2.0 0 -125 -300 Typ Max VCC 0.8 30 Units V V A A
Notes: 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
September 2005
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Micrel, Inc.
Precision Edge(R) SY89832U
AC ELECTRICAL CHARACTERISTICS(7)
VCC = +2.5V 5% or +3.3V 10%; RL = 100 across the outputs; TA = -40C to +85C unless otherwise stated. Symbol fMAX tpd tSKEW tS tH tJITTER Parameter Maximum Frequency Propagation Delay IN-to-Q IN-to-Q Within-Device Skew Part-to-Part Skew Set-Up Time Hold Time EN to IN, /IN EN to IN, /IN Condition VOUT 200mV VIN < 400mV VIN 400mV Note 8 Note 9 Note 10 Note 10 Note 11 Note 12 Note 13 Note 14 At full output swing. 70 150 300 300 1 10 1 10 225 Min 2.0 370 300 Typ 2.5 470 410 5 570 500 20 200 Max Units GHz ps ps ps ps ps ps psRMS psPP psRMS psPP ps
Data Random Jitter (RJ) Deterministic Jitter (DJ) Clock Cycle-to-Cycle Jitter Total Jitter (TJ)
tr, tf
Notes: 7. 8. 9.
Output Rise/Fall Times (20% to 80%)
High-frequency AC parameters are guaranteed by design and characterization. Within device skew is measured between two different outputs under identical input transitions. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the respective inputs.
10. Set-up and hold times apply to synchronous applications that intend to enable/disable before the next clock cycle. For asynchronous applications, set-up and hold times do not apply. 11. Random jitter is measured with a K28.7 pattern, measured at fMAX. 12. Deterministic jitter is measured at 2.5Gbps with both K28.5 and 223-1 PRBS pattern. 13. Cycle-to-cycle jitter definition: The variation period between adjacent cycles over a random sample of adjacent cycle pairs. tJITTER_CC = Tn -Tn+1, where T is the time between rising edges of the output signal. 14. Total jitter definition: with an ideal clock input frequency of fMAX (device), no more than one output edge in 1012 output edges will deviate by more than the specified peak-to-peak jitter value.
TIMING DIAGRAM
EN VCC/2 tS /IN IN VIN tpd /Q Q VOUT tH VCC/2
September 2005
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Micrel, Inc.
Precision Edge(R) SY89832U
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0V, RL = 100 across the outputs; TA = 25C, VIN = 400mV, unless otherwise stated.
Output Swing vs. Frequency
400 PROPAGATION DELAY (ps) OUTPUT SWING (mV) 350 300 250 200 150 100 50 0 0 0.5 1 1.5 2 2.5 FREQUENCY (MHz) 3 525 500 475 450 425 400 375 350 325 100
Propagation Delay vs. Input Voltage Swing
300 500 700 900 INPUT VOLTAGE SWING (V)
September 2005
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M9999-092005 hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
Precision Edge(R) SY89832U
FUNCTIONAL CHARACTERISTICS
VCC = 2.5V, GND = 0V, VIN = 400mV, RL = 100 across the outpouts; TA = 25C, unless otherwise stated.
155MHz Output
622MHz Output
Output Swing (75mV/div.)
Output Swing (75mV/div.)
TIME (1.291ns/div.)
TIME (200ps/div.)
1GHz Output
Output Swing (75mV/div.)
TIME (200ps/div.)
September 2005
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Precision Edge(R) SY89832U
INPUT STAGE
VCC
1.86k1/2
1.86k1/2
1.86k1/2
1.86k1/2
IN 509 VT 509 /IN GND
Figure 1. Simplified Differential Input Buffer
LVDS OUTPUTS
LVDS specifies a small swing of 325mV typical, on a nominal 1.2V common mode above ground. The common mode voltage has tight limits to permit large variations in ground noise between an LVDS driver and receive
50
vOUT vOH, vOL vOH, vOL 100
50
vOCM, vOCM
GND
GND
Figure 2a. LVDS Differential Measurement
Figure 2b. LVDS Common Mode Measurement
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VIN, VOUT 325mV (typical)
650mV (typical) VDIFF_IN , V DIFF_OUT
Figure 2c. Single-Ended Swing
Figure 2d. Differential Swing
September 2005
8
M9999-092005 hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
Precision Edge(R) SY89832U
INPUT INTERFACE APPLICATIONS
VCC = 2.5V
VCC = 2.5V
VCC = 2.5V
VCC = 2.5V
VCC = 2.5V
VCC = 2.5V
IN CML /IN SY89832U
IN IN CML /IN SY89832U VCC 0.01F VCC-2V* 19 VREF_AC NC VT
LVPECL
/IN SY89832U
NC NC
VT VREF_AC
VCC 0.01F
VT VREF_AC
Figure 3a. DC-Coupled CML Input Interface
Figure 3b. AC-Coupled CML Input Interface
Figure 3c. DC-Coupled LVPECL Input Interface
(*Bypass with 0.01F to GND)
VCC = 2.5V
VCC = 2.5V
VCC = 2.5V
VCC = 2.5V
IN
LVPECL
IN
/IN SY89832U Rpd 50 Rpd 50 VT VREF_AC 0.01F VCC = 2.5V
LVDS /IN SY89832U NC NC VT VREF_AC
Figure 3d. AC-Coupled LVPECL Input Interface
Figure 3e. LVDS Input Interface
RELATED PRODUCT AND SUPPORT DOCUMENTATION
Part Number SY89830U SY89831U SY89833U SY89834U Function 2.5V/3.3/5V 2.5GHz 1:4 PECL/ECL Clock Driver with 2:1 Differential Input MUX Ultra-Precison 1:4 LVPECL Fanout Buffer/Translator with Internal Termination 3.3V Ultra-Precision 1:4 LVDS Fanout Buffer with Internal Termination Data Sheet Link http://www.micrel.com/product-info/products/sy89830u.shtml http://www.micrel.com/product-info/products/sy89831u.shtml http://www.micrel.com/product-info/products/sy89833u.shtml
2.5/3.3V Two Input, 1GHz LVTTL/CMOS-to-LVPECL 1:4 Fanout Buffer/Translator http://www.micrel.com/product-info/products/sy89834u.shtml 16-MLFTM Manufacturing Guidelines Exposed Pad Application Note http://www.amkor.com/products/notes_papers/MLF_appnote_0301.pdf http://www.micrel.com/product-info/as/solutions.shtml
HBW Solutions
New Products and Applications
September 2005
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Micrel, Inc.
Precision Edge(R) SY89832U
16 LEAD EPAD MicroLeadFrameTM (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 MLFTM Package (Always solder, or equivalent, the exposed pad to the PCB) Package Notes: Note 1. Note 2. Package meets Level 2 moisture sensitivity classification, and are shipped in dry-pack form. 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 datasheet 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. September 2005
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