ICS8S89831I Datasheet, PDF (10/21 Pages) Integrated Device Technology – Output frequency

ICS8S89831I Data Sheet
DIFFERENTIAL LVPECL-TO-LVPECL/ECL FANOUT BUFFER
2.5V LVPECL Input with Built-In 50Ω Termination Interface
The IN /nIN with built-in 50Ω terminations accept LVDS, LVPECL,
CML, SSTL and other differential signals. Both signals must meet the
V_IN and V_IH input requirements. Figures 3A to 3D show interface
examples for the IN/nIN with built-in 50Ω termination input driven by
the most common driver types. The input interfaces suggested here
are examples only. If the driver is from another vendor, use their
termination recommendation. Please consult with the vendor of the
driver component to confirm the driver termination requirements.
3.3V or 2.5V
2.5V
Zo = 50Ω
IN
Zo = 50Ω
VT
nIN
LVDS
Figure 3A. IN/nIN Input with Built-In 50Ω
Driven by an LVDS Driver
Receiver
With
Built-In
50Ω
2.5V
2.5V
LVPECL
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
R1
18Ω
Figure 3B. IN/nIN Input with Built-In 50Ω
Driven by an LVPECL Driver
Receiver
With
Built-In
50Ω
2.5V
2.5V
CML
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
Receiver
With
Built-In
50Ω
Figure 3C. IN/nIN Input with Built-In 50Ω
Driven by a CML Driver with Open Collector
2.5V
2.5V
R1
25Ω
Zo = 50Ω
IN
Zo = 50Ω
VT
nIN
SSTL ^R2
25Ω
Figure 3D. IN/nIN Input with Built-In 50Ω
Driven by an SSTL Driver
Receiver
With
Built-In
50Ω
ICS8S89831AKI REVISION A APRIL 26, 2010
10
©2010 Integrated Device Technology, Inc.