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SY58032UMI Datasheet(PDF) 8 Page - Micrel Semiconductor

Part # SY58032UMI
Description  ULTRA-PRECISION 1:8 FANOUT BUFFER WITH LVPECL OUTPUTS AND INTERNAL TERMINATION
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

SY58032UMI Datasheet(HTML) 8 Page - Micrel Semiconductor

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8
Precision Edge®
SY58032U
Micrel, Inc.
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
PartNumber Function
DataSheetLink
SY58031U
Ultra-Precision 1:8 Fanout Buffer with 400mV CML
http://www.micrel.com/product-info/products/sy58031u.shtml
Outputs and Internal I/O Termination
SY58032U
Ultra-Precision 1:8 Fanout Buffer with LVPECL
http://www.micrel.com/product-info/products/sy58032u.shtml
Outputs and Internal Termination
SY58033U
Ultra-Precision 1:8 Fanout Buffer with 400mV LVPECL
http://www.micrel.com/product-info/products/sy58033u.shtml
Outputs and Internal Termination
32-MLF® Manufacturing Guidelines Exposed Pad
www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
Application Note
HBW Solutions
http://www.micrel.com/product-info/as/solutions.shtml
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
R2
82Ω
R2
82Ω
For +2.5V systems,
R1=250Ω,R2=62.5Ω
ZO =50Ω
ZO =50Ω
+3.3V
+3.3V
VT = VCC –2V
R1
130Ω
R1
130Ω
+3.3V
Figure4.ParallelTermination-TheveninEquivalent
LVPECL OUTPUT
LVPECL has high input impedance, and very low output
impedance (open emitter), and small signal swing which
resultsinlowEMI.LVPECLisidealfordriving50Ωand100Ω
controlled impedance transmission lines. There are several
techniques for terminating the LVPECL output: 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.
Z =50Ω
Z =50Ω
50Ω
50Ω
+3.3V
+3.3V
“source”
“destination”
Rb
VCC
C1 (optional)
0.01µF
Notes:
1. Power-saving alternative to Thevenin termination.
2. Place termination resistors as close to destination inputs as possible.
3. Rb resistor sets the DC bias voltage, equal to VT.
4. For 2.5V systems, Rb =19Ω,For3.3Vsystems,Rb =50Ω
Figure5.ParallelTermination(3-Resistor)


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