sy89854u Micrel Semiconductor, sy89854u Datasheet

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sy89854u

Manufacturer Part Number
sy89854u
Description
Precision Low Power 1 4 Lvpecl Fanout Buffer/translator With Internal Termination
Manufacturer
Micrel Semiconductor
Datasheet

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General Description
The SY89854U is a 2.5V/3.3V precision, high-
speed, fully differential 1:4 LVPECL fanout buffer.
Optimized to provide four identical output copies
with less than 20ps of skew and less than 10ps
total jitter, the SY89854U can process clock signals
as fast as 2GHz.
The differential input includes Micrel’s unique, patent
pending 3-pin input termination architecture that
interfaces to any differential signal (AC or DC-
coupled) as small as 100mV (200mVpp) 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 center-tap (VT)
pin.
rise/fall times guaranteed to be less than 180ps.
The SY89854U 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.
The SY89854U is part of Micrel’s high-speed,
Precision Edge
All support documentation can be found on Micrel’s
web site at: www.micrel.com.
Typical Applications
August 2007
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
The outputs are 800mV LVPECL, with fast
®
product line.
200MHz (Q - /Q)
TIME (600ps/di v.)
(pp)
Buffer/Translator with Internal Termination
Precision Low Power 1:4 LVPECL Fanout
Features
• Precision 1:4, LVPECL fanout buffer
• Low power: 137mW (2.5V typ)
• Guaranteed AC performance over temperature
• Ultra-low jitter design:
• Unique patent pending input termination and VT
• Typical 800mV (100k) LVPECL output swing
• Power supply 2.5V ±5% or 3.3V ±10%
• Industrial temperature range –40°C to +85°C
• Available in ultra-small (3mm x 3mm) 16-pin MLF
Applications
• SONET and All GigE clock distribution
• Fibre Channel clock and data distribution
• Backplane distribution
and supply voltage:
– DC- to > 2GHz Clock f
– <340ps t
– <180ps t
– <20ps max. skew
– <1ps
– <10ps
– <10ps
pin accepts DC-coupled and AC-coupled inputs
(CML, PECL, LVDS)
package
(rms)
(pp)
(pp)
pd
r
random jitter
SY89854U
/t
deterministic jitter
total jitter (clock)
f
time
hbwhelp@micrel.com
MAX
Precision Edge
M9999-082907-C
or (408) 955-1690
®
®

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sy89854u Summary of contents

Page 1

... The outputs are 800mV LVPECL, with fast rise/fall times guaranteed to be less than 180ps. The SY89854U 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. The SY89854U is part of Micrel’s high-speed, ® ...

Page 2

... Interface Applications” section for more details. 2 Package Marking Lead Finish Pb-Free NiPdAu Pb-Free NiPdAu –2V. Unused output CC –1.2V used when AC coupling CC to the VT pin. Bypass VREF-AF pin with a REF-AC . Maximum sink/source capability is 1.5mA. See CC M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 SY89854U ). Each pin PP ...

Page 3

... Micrel, Inc. Functional Block Diagram August 2007 3 hbwhelp@micrel.com SY89854U M9999-082907-C or (408) 955-1690 ...

Page 4

... A (4) ® (θ Still-Air ........................................................ 60°C/W ® (ψ Junction-to-Board ...................................... 38°C/W Min Typ 2.375 2.5 3.0 3 100 –1 0.1 0.2 hbwhelp@micrel.com SY89854U Max Units 2.625 V 3 Ω 110 Ω –0 1 1.28 V and JA M9999-082907-C or (408) 955-1690 ...

Page 5

... R = 50Ω Condition See Figure 1a. See Figure 1b. 5 –2V, unless otherwise stated. CC Min Typ Max V –1.145 V –0.895 –1.945 V –1.695 CC CC 550 800 1100 1600 M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 SY89854U Units ...

Page 6

... Typ ≥ 400mV 2.0 3.5 2.5 140 220 pk 100 4 50 100 – T where T is the time between rising edges of the n n-1 12 output edges will deviate by more M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 SY89854U Max Units GHz Gbps 340 150 RMS ...

Page 7

... Micrel, Inc. Typical Operating Characteristics V = 2.5V 100mV , T = 25°C, unless otherwise stated August 2007 7 hbwhelp@micrel.com SY89854U M9999-082907-C or (408) 955-1690 ...

Page 8

... Micrel, Inc. Functional Characteristics V = 2.5V 100mV 25°C, unless otherwise stated August 2007 8 hbwhelp@micrel.com SY89854U M9999-082907-C or (408) 955-1690 ...

Page 9

... Micrel, Inc. Single-Ended and Differential Swings Figure 1a. Singled-Ended Voltage Swing Timing Diagrams August 2007 Figure1b. Differential Voltage Swing 9 hbwhelp@micrel.com SY89854U M9999-082907-C or (408) 955-1690 ...

Page 10

... Micrel, Inc. Input and Output Stages Figure 2a. Simplified Differential Input Stage August 2007 Figure 2b. Simplified LVPECL Output Stage 10 hbwhelp@micrel.com SY89854U M9999-082907-C or (408) 955-1690 ...

Page 11

... Micrel, Inc. Input Interface Applications 3a. LVPECL Interface (DC-Coupled) 3d. CML Interface (AC-Coupled) August 2007 3b. LVPECL Interface (AC-Coupled) 3e. LVDS Interface 11 hbwhelp@micrel.com SY89854U Option: may connect 3c. CML Interface (DC-Coupled) M9999-082907-C or (408) 955-1690 ...

Page 12

... LVPECL Fanout Buffer/Translator with Internal Termination ® MLF Application Note HBW Solutions New Products and Applications August 2007 Note: For +2.5V systems 19Ω For +3.3V systems 50Ω Figure 4b. Parallel Termination (3-Resistor) Data Sheet Link www.micrel.com/product-info/products/sy58021u.shtml www.amkor.com/products/notes_papers/MLF_AppNote.pdf www.micrel.com/product-info/products/solutions.shtml 12 hbwhelp@micrel.com SY89854U M9999-082907-C or (408) 955-1690 ...

Page 13

... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. August 2007 ® (MLF-16) © 2005 Micrel, Incorporated. 13 SY89854U M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 ...

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