ICS8S89874I Datasheet, PDF (9/19 Pages) Integrated Device Technology – 1:2 Differential-to-LVPECL Buffer/Divider

ICS8S89874I Data Sheet
1:2 DIFFERENTIAL-TO-LVPECL BUFFER/DIVIDER
Applications Information
3.3V Differential 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 2A to 2D show interface
examples for the IN/nIN input with built-in 50Ω terminations 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
3.3V
LVDS
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
Receiver
With
Built-In
50Ω
Figure 2A. N/nIN Input with Built-In 50Ω
Driven by an LVDS Driver
3.3V
3.3V
Zo = 50Ω
IN
VT
Zo = 50Ω
nIN
CML – Open Collector
Figure 2C. IN/nIN Input with Built-In 50Ω
Driven by a CML Driver
Receiver
With
Built-In
50Ω
3.3V
3.3V
LVPECL
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
R1
50Ω
Receiver
With
Built-In
50Ω
Figure 2B. IN/nIN Input with Built-In 50Ω
Driven by an LVPECL Driver
3.3V
3.3V
Zo = 50Ω
Zo = 50Ω
CML – Built-in 50Ω Pull-up
IN
VT
nIN
Receiver
With
Built-In
50Ω
Figure 2D. IN/nIN Input with Built-In 50Ω Driven by a
CML Driver with Built-In 50Ω Pullup
ICS8S89874BKI REVISION A OCTOBER 22, 2010
9
©2010 Integrated Device Technology, Inc.