ICS8S89874I Datasheet, PDF (10/19 Pages) Integrated Device Technology – 1:2 Differential-to-LVPECL Buffer/Divider

ICS8S89874I Data Sheet
1:2 DIFFERENTIAL-TO-LVPECL BUFFER/DIVIDER
2.5V LVPECL Input with Built-In 50Ω Termination Interface
The IN /nIN with built-in 50Ω terminations accept LVDS, LVPECL,
CML 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
LVDS
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
Receiver
With
Built-In
50Ω
Figure 3A. IN/nIN Input with Built-In 50Ω
Driven by an LVDS Driver
2.5V
2.5V
Zo = 50Ω
IN
VT
Zo = 50Ω
nIN
CML
Figure 3C. IN/nIN Input with Built-In 50Ω
Driven by a CML Driver
Receiver
With
Built-In
50Ω
2.5V
LVPECL
Zo = 50Ω
Zo = 50Ω
2.5V
IN
VT
nIN
R1
18Ω
Receiver
With
Built-In
50Ω
Figure 3B. IN/nIN Input with Built-In 50Ω
Driven by an LVPECL Driver
2.5V
2.5V
Zo = 50Ω
Zo = 50Ω
CML - Built-in 50Ω Pull-up
IN
VT
nIN
Receiver
With
Built-In
50Ω
Figure 3D. IN/nIN Input with Built-In 50Ω Driven by a
CML Driver with Built-In 50Ω Pullup
ICS8S89874BKI REVISION A OCTOBER 22, 2010
10
©2010 Integrated Device Technology, Inc.