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PDF SY89851U Data sheet ( Hoja de datos )
| Número de pieza | SY89851U | |
| Descripción | 1:2 LVPECL Fanout Buffer/Translator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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SY89851U
Low Power, 3GHz, 1:2 LVPECL Fanout
Buffer/Translator with Internal Termination
General Description
The SY89851U is a low jitter, low skew, high-speed
1:2 differential fanout buffer optimized for precision
telecom and enterprise server distribution
applications. The SY89851U distributes clock
frequencies from DC to >3GHz, and data rates to
2.5Gbps guaranteed over temperature and voltage.
The SY89851U differential input includes Micrel's
unique, 3-pin input termination architecture that
directly 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. The outputs are 800mV, 100K-
compatible LVPECL with extremely fast rise/fall time
guaranteed to be less than 180ps.
The SY89851U operates from a 2.5V ±5% or 3.3V
±10% supply and is guaranteed over the full
industrial temperature range of –40°C to +85°C. The
SY89851U is part of Micrel's high-speed, Precision
Edge® product line.
All support documentation can be found on Micrel's
web site at www.micrel.com.
Functional Block Diagram
Features
Precision Edge®
• Precision 1:2, 800mV LVPECL fanout buffer
• Low power consumption: 80mW typ. (2.5V)
• Guaranteed AC performance over temperature
and voltage:
– DC to >3GHz clock throughput
– <340ps propagation delay
– <180ps rise/fall time
– <20ps output-to-output skew
• Ultra-low jitter design:
– <1psRMS random jitter
– <10psPP deterministic jitter
– <10psPP total jitter (clock)
• Unique, patented input termination and VT pin
accepts DC- and AC-coupled inputs (CML,
LVPECL, LVDS)
• 100K LVPECL-compatible outputs
• Power supply 2.5V ±5% or 3.3V ±10%
• –40°C to +85°C industrial temperature range
• Available in 16-pin (3mm x 3mm) MLF™ package
Applications
• All SONET and GigE clock distribution
• Fibre Channel applications
• Backplane distribution
• High-end, low skew, multiprocessor synchronous
clock distribution
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
July 2005
M9999-071205
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
SY89851U
100K LVPECL Output DC Electrical Characteristics(6)
VCC = 2.5V ±5% or 3.3V ±10%; TA = –40°C to + 85°C; RL = 50Ω to VCC –2V, unless otherwise stated.
Symbol
VOH
Parameter
Output HIGH Voltage
(Q, /Q)
Condition
Min Typ Max
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.
550 800
VDIFF_OUT Differential Output Voltage Swing
(Q, /Q)
See Figure 1b.
1100
1600
Note:
6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been
established.
Units
V
V
mV
mV
July 2005
5 M9999-071205
[email protected] or (408) 955-1690
5 Page 
Micrel, Inc.
LVPECL 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 several techniques for terminating
SY89851U
the LVPECL output including: 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.
Figure 4a. Parallel Thevenin-Equivalent
Termination
Figure 4b. Parallel Termination
(3-Resistor)
Related Product and Support Documentation
Part Number
SY58012U
HBW Solutions
Function
5GHz, 1:2 LVPECL Fanout Buffer/Translator
with Internal Input Termination
MLFTM Application Note
New Products and Applications
Data Sheet Link
www.micrel.com/product-info/products/sy58012u.shtml
www.amkor.com/products/notes_papers/MLF_AppNote.pdf
www.micrel.com/product-info/products/solutions.shtml
July 2005
11 M9999-071205
[email protected] or (408) 955-1690
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SY89851U.PDF ] | |
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