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PDF SY89855U Data sheet ( Hoja de datos )
| Número de pieza | SY89855U | |
| Descripción | Precision Low Power Differential LVPECL 4:1 MUX | |
| Fabricantes | Micrel Semiconductor | |
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SY89855U
Precision Low Power Differential LVPECL 4:1
MUX with 1:2 Fanout and Internal Termination
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
Features
Precision Edge®
2.5GHz and data streams up to 2.5Gbps. In addition, a • Select 1 of 4 differential inputs
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
• Provides two copies of the selected input
• Low power 260mW (VCC = 2.5V)
• Guaranteed AC performance over temperature and
voltage:
– DC-to->2.5Gbps data rate throughput
– <410ps In-to-Q tpd
result is a clean, stub-free, low-jitter interface solution.
– <180ps tr / tf times
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
• Ultra low-jitter design:
– <10psPP total jitter (clock)
– <1psRMS random jitter
– <10psPP deterministic jitter
– <0.7psRMS crosstalk-induced jitter
applications that require higher performance, conswidwwe.DrataSheet•4U.comUnique, patent-pending input design minimizes
the SY58029U. The SY89855U is part of Micrel’s high-
crosstalk
speed, Precision Edge® product line.
• Accepts an input signal as low as 100mV
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Typical Performance
• Unique patented input termination and VT pin
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
• 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® package
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
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
February 2007
M9999-022007-B
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
SY89855U
LVPECL Output DC Electrical Characteristics(5)
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA = –40°C to +85°C, unless otherwise noted.
Symbol Parameter
Condition
Min Typ Max
VOH Output High Voltage
(Q, /Q)
VCC–1.145
VCC–0.895
VOL Output Low Voltage
(Q, /Q)
VCC–1.945
VCC–1.695
VOUT
Output Voltage Swing
(Q, /Q)
See Figure 1a.
400 800
VDIFF-OUT Differential Output Voltage Swing See Figure 1b.
(Q, /Q)
800 1600
Units
V
V
mV
mV
LVTTL/CMOS DC Electrical Characteristics(5)
VCC = 2.5V ±5% or 3.3V ±10%; TA = –40°C to +85°C, unless otherwise noted.
Symbol Parameter
Condition
Min Typ Max
VIH Input High Voltage
VIL Input Low Voltage
IIH Input High Current
IIL Input Low Current
VIN = VCC
VIN = 0.5V
2.0
–300
0.8
75
Notes:
5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Units
V
V
µA
µA
February 2007
5 M9999-022007-B
[email protected] or (408) 955-1690
5 Page 
Micrel, Inc.
Output Interface Applications
LVPECL has high input impedance, very low output
(open emitter) impedance, and small signal swing,
which result in low EMI. LVPECL is ideal for driving
50Ω and 100Ω controlled impedance transmission
lines. There are different techniques for terminating
SY89855U
LVPECL outputs: parallel termination thevenin-
equivalent, parallel termination (3-resistor), and AC-
coupled termination. Unused output pairs may be left
floating; however, single-ended outputs must be
terminated or balanced.
Note:
For a 2.5V system, R1 = 250Ω, R2 = 62.5Ω.
Figure 4a. Parallel Thevenin-Equivalent
Termination
Note:
1. For a 2.5V system, Rb = 19Ω.
Figure 4b. Parallel Termination
(3-Resistor)
Note:
For a 2.5V system, R = 50Ω.
Figure 4c. AC-Coupled Termination
Note:
For a 2.5V system, R1 = 250Ω, R2 = 62.5 Ω.
Figure 4d. Parallel Thevenin-Equivalent
Termination
Related Product and Support Documentation
Part Number
SY58029U
HBW Solutions
Function
Ultra Precision Differential LVPECL 4 :1
MUX with 1 :2 Fanout Internal Termination
MLF® Application Note
New Products and Applications
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
February 2007
11 M9999-022007-B
[email protected] or (408) 955-1690
11 Page | ||
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