sy89855u Micrel Semiconductor, sy89855u Datasheet

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sy89855u

Manufacturer Part Number
sy89855u
Description
Precision Low Power Differential Lvpecl 4 1 Mux With 1 2 Fanout And Internal Termination
Manufacturer
Micrel Semiconductor
Datasheet

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Part Number:
sy89855uMG-TR
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
General Description
The SY89855U is a 2.5V/3.3V precision, high-speed,
4:1 differential multiplexer with 100K LVPECL (800mV)
compatible outputs, capable of handling clocks up to
2.5GHz and data streams up to 2.5Gbps. 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 800mV LVPECL, (100K temperature
compensated) with fast rise/fall times guaranteed to be
less than 180ps.
The SY89855U 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. For
applications that require higher performance, consider
the SY58029U. The SY89855U 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 Performance
August 2007
Precision Edge is a registered trademark of Micrel, Inc
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
®
product line.
MUX with 1:2 Fanout and Internal Termination
Precision Low Power Differential LVPECL 4:1
Features
• Select 1 of 4 differential inputs
• Provides two copies of the selected input
• Low power 260mW (V
• Guaranteed AC performance over temperature and
• Ultra low-jitter design:
• Unique, patent-pending input design minimizes
• Accepts an input signal as low as 100mV
• Unique patented input termination and VT pin
• 800mV 100K LVPECL output swing
• Power supply 2.5V ±5% or 3.3V ±10%
• –40°C to +85°C temperature range
• Available in 32-pin (5mm x 5mm) MLF
Applications
• Redundant clock and/or data distribution
• All SONET/OC-3 to OC-48 clock/data distribution
• Loopback
• All Fibre Channel applications
• All GigE applications
Markets
• LAN/WAN communication
• Enterprise servers
• ATE
• Test and measurement
voltage:
– DC-to->2.5Gbps data rate throughput
– <410ps In-to-Q t
– <180ps t
– <10ps
– <1ps
– <10ps
– <0.7ps
crosstalk
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
RMS
PP
PP
RMS
r
total jitter (clock)
deterministic jitter
random jitter
/ t
crosstalk-induced jitter
SY89855U
f
times
hbwhelp@micrel.com
pd
CC
= 2.5V)
M9999-082907-C
or (408) 955-1690
Precision Edge
®
package
®

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sy89855u Summary of contents

Page 1

... The outputs are 800mV LVPECL, (100K temperature compensated) with fast rise/fall times guaranteed to be less than 180ps. The SY89855U 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. For applications that require higher performance, consider the SY58029U. The SY89855U is part of Micrel’ ...

Page 2

... Micrel, Inc. Functional Block Diagram Truth Table SEL1 August 2007 SEL0 SY89855U Q IN0 Input Select IN1 Input Select IN2 Input Select IN3 Input Select M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 ...

Page 3

... VREF-AC3 August 2007 Operating Package Marking Range Industrial SY89855U with Pb-Free bar-line indicator Industrial SY89855U with Pb-Free bar-line indicator = 25ºC, DC Electricals only. A ® 32-Pin MLF (MLF-32) Pin Function Differential Input: Each pair accepts AC- or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates pin through 50Ω. Note that these inputs will default to an indeterminate state if left open input is not used, connect one end of the differential pairs to ground through a 1kΩ ...

Page 4

... Still-Air.........................................................35°C/W 500lfpm .......................................................28°C/W ® (ψ Junction-to-Board .......................................16°C/W Min Typ 2.375 2.5 3.0 3 100 V – 1 0.1 0.2 V – 1.3 V – 1 hbwhelp@micrel.com SY89855U Max Units 2.625 V 3 Ω 55 Ω 110 – – 1 and ψ ...

Page 5

... Condition See Figure 1a. See Figure 1b. (5) = –40°C to +85°C, unless otherwise noted. A Condition 0. SY89855U Min Typ Max V –1.145 V –0.895 –1.945 V –1.695 CC CC 400 800 800 ...

Page 6

... CC Min Typ 2.5 2.5 210 300 100 300 234 9 50 100 . – T where T is the time between rising edges of the n n-1 12 output edges will deviate by more than hbwhelp@micrel.com SY89855U Max Units Gbps GHz 410 ps 500 ps fs/° 150 RMS ...

Page 7

... Micrel, Inc. Typical Operating Characteristics V = 2.5V, GND = 100mV August 2007 = –40° 85° 50Ω –2V, unless otherwise stated. CC M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 SY89855U ...

Page 8

... Micrel, Inc. Functional Characteristics V = 3.3V ±10 –40° 85° August 2007 = 50Ω –2V, unless otherwise stated SY89855U M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 ...

Page 9

... Micrel, Inc. Single-Ended and Differential Swings Figure 1a. Single-Ended Voltage Swing Timing Diagram August 2007 Figure 1b. Differential Voltage Swing IN-to-Q Timing Diagram SEL-to-Q Timing Diagram 9 SY89855U M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 ...

Page 10

... Figure 2a. Simplified Differential Input Stage Input Interface Applications Figure 3a. LVPECL Interface (DC-Coupled) Figure 3d. CML Interface (AC-Coupled) August 2007 option: may connect Figure 3b. LVPECL Interface (AC-Coupled) Figure 3e. LVDS Interface 10 SY89855U Figure 2b. PECL Output Stage Figure 3c. CML Interface (DC-Coupled) M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 ...

Page 11

... Unused output pairs may be left floating; however, single-ended outputs must be terminated or balanced. Note: 1. For a 2.5V system 19Ω. Figure 4b. Parallel Termination (3-Resistor) Note: For a 2.5V system 250_ 62.5 _. Figure 4d. Parallel Thevenin-Equivalent Termination Data Sheet Link www.micrel.com/product-info/products/sy58029u.shtml. www.amkor.com/products/notes_papers/MLFAppNote.pdf www.micrel.com/product-info/products/solutions.shtml 11 hbwhelp@micrel.com SY89855U M9999-082907-C or (408) 955-1690 ...

Page 12

... MLF (MLF-32) PCB Thermal Consideration for 32-Pin MLF Packages Notes: 1. Package meets Level 2 Moisture Sensitivity Classification. 2. All parts are dry-packed before shipment. 3. Exposed pads must be soldered to a ground for proper thermal management. 12 SY89855U ® Package M9999-082907-C hbwhelp@micrel.com 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 © 2005 Micrel, Incorporated. 13 SY89855U M9999-082907-C hbwhelp@micrel.com or (408) 955-1690 ...

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