sy89473u Micrel Semiconductor, sy89473u Datasheet - Page 10

• Manufacturer Part Number: sy89473u
• Description: Sy89473u Precision Lvpecl 2 1 Multiplexer With 1 2 Fanout And Internal Termination
• Manufacturer: Micrel Semiconductor

Related Product and Support Information
LVPECL Output Interface Applications
LVPECL has a high input impedance, a very low
output impedance (open emitter), and a small signal
swing which results in low EMI. LVPECL is ideal for
driving
transmission lines. There are several techniques for
terminating the LVPECL output including: Parallel
Termination-Thevenin
Termination
Termination. Unused output pairs may be left
floating. However, single-ended outputs must be
terminated, or balanced.
Note:
1.
Part Number
SY89474U
SY89475U
HBW
Solutions
Figure 4a. Parallel Termination-Thevenin Equivalent
May 2007
For +2.5V systems, R1 = 250Ω, R2 = 62.5Ω.
50Ω-
(3-resistor),
Function
Precision LVDS 2:1 Multiplexer with
1:2 Fanout and Internal Termination
Precision CML 2:1 Multiplexer with
1:2 Fanout and Internal Termination
MLF
New Products and Applications
and-100Ω-controlled
®
Application Note
Equivalent,
and
AC-coupled
impedance
Parallel
Data Sheet Link
www.micrel.com/product-info/products/sy89474u.shtml
www.micrel.com/product-info/products/sy89475u.shtml
www.amkor.com/products/notes_papers/MLFAppNote.pdf
www.micrel.com/product-info/products/solutions.shtml
10
Note:
1.
2.
3.
4.
Power-saving alternative to Thevenin termination.
Place termination resistors as close to destination inputs as
possible.
Rb resistor sets the DC bias voltage, equal to V
For 2.5V systems, Rb = 19Ω.
Figure 4b. Parallel Termination (3-Resistor)
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