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M9999-063010

hbwhelp@micrel.com or (408) 955-1690

6GHz, 1:2 FANOUT BUFFER/TRANSLATOR

w/400mV LVPECL OUTPUTS and INTERNAL

INPUT TERMINATION

Precision Edge®

SY58013U

Rev.: F Amendment: /0

Issue Date: November 2011

DESCRIPTION

■Precision 1:2, 400mV LVPECL fanout buffer

■ Low jitter performance:

•55fsRMS phase jitter (typ)

■Accepts an input signal as low as 100mV

■Guaranteed AC performance over temperature and

voltage:

•> 6GHz fMAX clock

•< 80ps tr/tf times

•< 250ps tpd

•< 15ps max. skew

■Unique input termination and VT pin accepts

DC-coupled and AC-coupled differential

inputs: LVPECL, LVDS and CML

■400mV LVPECL compatible outputs

■Power supply 2.5V ±5% and 3.3V ±10%

■–40°C to +85°C temperature range

■Available in 16-pin (3mm x 3mm) QFN package

FEATURES

APPLICATIONS

■All SONET and All GigE clock distribution

■Fibre Channel clock and data distribution

■Backplanes

■Data distribution: OC-48, OC-48+FEC, XAUI

■High-end, low-skew, multiprocessor synchronous

clock distribution

The SY58013U is a 2.5V/3.3V precision, high-speed, fully

differential 1:2 LVPECL fanout buffer. Optimized to provide

two identical output copies with less than 15ps of skew and

only 55fsRMS phase jitter, the SY58013U can process clock

signals as fast as 6GHz or data patterns up to 10.7Gbps.

The differential input includes Micrel’s unique, 3-pin input

termination architecture that interfaces to LVPECL, LVDS,

and CML differential signals, (AC- or DC-coupled) as small

as 100mV without any level-shifting or termination resistor

networks in the signal path. For AC-coupled input interface

applications, an on-board output reference voltage (VREF-

AC) is provided to bias the VT pin. The outputs are 400mV

LVPECL compatible, with extremely fast rise/fall times

guaranteed to be less than 80ps.

The SY58013U operates from a 2.5V ±5% supply or

3.3V ±10% supply and is guaranteed over the full industrial

temperature range (–40°C to +85°C). For applications that

require greater output swing or CML compatible outputs,

consider the SY58012U 1:2 fanout buffer with 800mV

LVPECL outputs, or the SY58011U 1:2 fanout buffer with

400mV CML outputs. The SY58013U is part of Micrel’s

high-speed, Precision Edge® product line. Datasheets and

support documentation can be found on Micrel’s web site at

www.micrel.com.

FUNCTIONAL BLOCK DIAGRAM TYPICAL PERFORMANCE

2GHz with 100mV Input

Precision Edge®

Precison Edge is a registered trademark of Micrel, Inc.

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

PACKAGE/ORDERING INFORMATION

Pin Number Pin Name Pin Function

1, 4 IN, /IN Differential Input: This input pair is the signal to be buffered. Each pin is internally

terminated with 50 ohms to the VT pin. Note that this input will default to an indeterminate

state if left open. See “Input Interface Applications” section.

2 VT Input Termination Center-Tap: Each input terminates to this pin. The V T pin provides a

   center-tapforeachinput(IN,/IN)toaterminationnetworkformaximuminterfaceexibility.

See “Input Interface Applications” section.

3 VREF-AC Reference Output Voltage: This output biases to V

CC –1.2V. It is used for AC-coupled

inputs (IN, /IN). Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR

capacitor to VCC. Maximum curent source or sink is 0.5mA. See “Input Interface

Applications” section.

5, 8, 13, 16 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the

VCC pins as possible.

6, 7, 14, 15 GND, Ground. Exposed pad must be connected to a ground plane that is the same potential

(Exposed Pad) as the ground pin.

12, 11 Q0, /Q0, LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The

 9,10 Q1,/Q1 outputswingistypically400mV.Unusedoutputpairsmaybeleftoatingwithnoimpacton

jitter. See “LVPECL Output Termination” section.

PIN DESCRIPTION

16-Pin QFN

Ordering Information(1)

Package Operating Package

Part Number Type Range Marking

SY58013UMG(3) QFN-16 Industrial 013U with

Pb-Free Pb-Free bar-line indicator

SY58013UMGTR(2, 3) QFN-16 Industrial 013U with

Pb-Free Pb-Free bar-line indicator

Notes:

1. Contact factory for die availability. Dice are guaranteed at T

A = 25°C, DC electricals only.

All devices are Pb-Free.

2. Tape and Reel.

3. Pb-Free package recommended for new designs.

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

Absolute Maximum Ratings(Note 1)

Power Supply Voltage (V CC ) ........................–0.5V to+4.0V

Input Voltage (VIN) ...........................................–0.5V to V

Output Current (IOUT)

Continuous ............................................................. 50mA

Surge .................................................................... 100mA

Current

Source or sink current on VT pin......................... ±100mA

Input Current

Source or sink current on (IN, /IN) ........................ ±50mA

VREF Current

Source or sink current on VREF-AC, ........ ±1.5mANote 4

Soldering, (20 sec.) ................................................... 260°C

Storage Temperature Range (T STORE ) ........ –65 to +150°C

Operating Ratings(Note 2)

Power Supply Voltage (VCC) ................. +2.375V to +3.60V

Operating Temperature Range (TA) ............ –40°C to +85°C

Package Thermal Resistance, Note 3

QFN(θJA)

Still-Air .............................................................................60°C/W

500lpfm ...........................................................................54°C/W

QFN(ψJB) .........................................................................33°C/W

TA= –40°C to +85°C

Symbol Parameter Condition Min Typ Max Units

VCC Power Supply Voltage 2.375 3.60 V

ICC Power Supply Current Max. VCC, no load 75 90 mA

VIH

Input HIGH Voltage IN, /IN, Note 6 V

CC–1.6 VCC V

VIL

Input LOW Voltage IN, /IN 0 VIH–0.1 V

VIN

Input Voltage Swing IN, /IN; see Figure 1a 0.1 1.7 V

VDIFF_IN Differential Input Voltage IN, /IN; see Figure 1b 0.2 V

RIN

In to VT Resistance 40 50 60 ohms

VREF

-AC Output Reference Voltage VCC –1.3

VCC –1.2

VCC –1.1 V

IN to VT 1.28 V

DC ELECTRICAL CHARACTERISTICS(Note 5)

VCC = 3.3V ±10% or VCC = 2.5 ±5%; RL= 50ohms to VCC–2V; TA= –40°C to 85°C, unless otherwise stated.

Symbol Parameter Condition Min Typ Max Units

VOH

Output HIGH Voltage Q0, /Q0, Q1, /Q1 VCC–1.145 VCC–1.020 VCC –0.895 V

VOL

Output LOW Voltage Q0, /Q0, Q1, /Q1 V

CC–1.545 VCC–1.420 VCC –1.295 V

VOUT

Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1a 200 400 mV

VDIFF_OUT Differential Output Voltage Swing Q0, /Q0, Q1, /Q1; see Figure 1b 400 800 mV

Note 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 ratings condi-

tions for extended periods may affect device reliability.

Note 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.

Note 3. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB.

Note 4. Due to the limited drive capability, use for input of the same package only.

Note 5. ThecircuitisdesignedtomeettheDCspecicationsshownintheabovetableafterthermalequilibriumhasbeenestablished.

Note 6. VIH (min) not lower than 1.2V.

LVPECL DC ELECTRICAL CHARACTERISTICS(Note 5)

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

VCC = 2.5V ±5% or 3.3V ±10%; T

A = –40°C to +85°C; RL = 50ohms to VCC–2V, unless otherwise stated.

Symbol Parameter Condition Min Typ Max Units

fMAX Maximum Operating Frequency NRZ Data 10 Gbps

VOUT x 200mV Clock 6 GHz

tpd Propagation Delay VIN x 100mV 100 180 250 ps

tCHAN Channel-to-Channel Skew 4 15 psNote 8

tSKEW Part-to-Part Skew 100 psNote 9

tJITTER Random Jitter Output = 622MHz 55 fs

Integration Range: 12kHz-20MHz

tr, tf Output Rise/Fall Time 20% to 80%, at full output swing 20 50 80 ps

Note 7. High frequency AC electricals are guaranteed by design and characterization.

Note 8. Skew is measured between outputs of the same bank under identical transitions.

Note 9. Skewisdenedfortwopartswithidenticalpowersupplyvoltagesatthesametemperatureandwithnoskewoftheedgesattherespective

inputs.

AC ELECTRICAL CHARACTERISTICS(Note 7)

TIMING DIAGRAMPHASE NOISE

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

SINGLE-ENDED AND DIFFERENTIAL SWINGS

Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing

TIMING DIAGRAM

SINGLE-ENDED AND DIFFERENTIAL SWINGS

Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

TYPICAL OPERATING CHARACTERISTICS

VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

FUNCTIONAL CHARACTERISTICS

VCC = 3.3V, VEE = 0V, VIN = 100mV, T

A = 25°C, unless otherwise stated.

(223–1 PRBS Pattern)

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

INPUT INTERFACE APPLICATIONS

Figure 3a. DC-Coupled

LVPECL Input Interface

Figure 3b. AC-Coupled

LVPECL Input Interface

Figure 3c. LVDS

Input Interface

Figure 3d. DC-Coupled

CML Input Interface

(option: may connect VT to VCC)

INPUT STAGE

Figure 2. Simplied Differential

Input Buffer

Figure 3e. AC-Coupled CML

Input Interface

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

Figure 4. Parallel Termination–Thevenin Equivalent

Note 1. For +2.5V systems: R1 = 250 ohms, R2 = 62.5 ohms

Note 2. For +3.3V systems: R1 = 130 ohms, R2 = 82 ohms

Figure 5. Three-Resistor “Y–Termination”

Note 1. Power-saving alternative to Thevenin termination.

Note 2. Place termination resistors as close to destination inputs as

possible.

Note 3. Rb resistor sets the DC bias voltage, equal to V

For +2.5V systems Rb = 39 ohms.

For +3.3V systems Rb = 46 ohms to 50 ohms.

Note 4. C1 is an optional bypass capacitor intended to compensate for

any tr/tf mismatches.

OUTPUT TERMINATION RECOMMENDATIONS

LVPECL outputs have very low output impedance (open

emitter), and small signal swing which results in low EMI

(electro-magnetic interference). The LVPECL is ideal for

driving 50 ohms and 100 ohms controlled impedance

transmission lines. In addition, LVPECL is compatible for

driving standard PECL inputs since PECL inputs require only

100mV input swing. Further, there are several techniques

in terminating the LVPECL outputs, as shown in Figure 4

through 6.

Figure 6. Terminating Unused I/O

Note 1. Unused output (/Q) must be terminated to balance the output.

Note 2. For +2.5V systems: R1 = 250 ohms, R2 = 62.5 ohms, R3 = 1.25k ohms,

R4 = 1.2k ohms.

For +3.3V systems: R1 = 130 ohms, R2 = 82 ohms, R3 = 1k ohms,

R4 = 1.6k ohms.

Note 3. Unusedoutputpairs(Qand/Q)maybeleftoating.

Part Number Function Data Sheet Link

SY58011U 7GHz, 1:2 CML Fanout Buffer/Translator http://www.micrel.com/product-info/prod/ucts/sy58011u.shtml

With Internal I/O Termination

SY58012U 5GHz, 1:2 LVPECL Fanout Buffer/Translator With http://www.micrel.com/product-info/products/sy58012u.shtml

Internal Input Termination

SY58013U 6GHz, 1:2 Fanout Buffer/Translator w/400mV http://www.micrel.com/product-info/products/sy58013u.shtml

LVPECL Outputs and Internal Input Termination

16-MLF® Manufacturing Guidelines www.amkor.com/products/notes_papers/mlf_AppNote_0902.

Exposed Pad Application Note .pdf

M-0317 HBW Solutions http://www.micrel.com/product-info/as/solutions.shtml

RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION

Precision Edge®

SY58013U

Micrel, Inc.

M9999-063010

hbwhelp@micrel.com or (408) 955-1690

16-PIN (QFN-16)QFN

PCB Thermal Consideration for 16-Pin QFN Package

(Always solder, or equivalent, the exposed pad to the PCB)

Package Notes:

Note1. PackagemeetsLevel2qualication.

Note 2. All parts are dry-packaged before shipment.

Note 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 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specicationsatanytimewithoutnotication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

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