9©2017 Integrated Device Technology, Inc. September 22, 2017
8S89832I Data Sheet
Application Information
Recommendations for Unused Output Pins
Outputs
LVDS Outputs
All unused LVDS output pairs can be either left floating or terminated
with 100 across. If they are left floating, we recommend that there
is no trace attached.
2.5V LVPECL Input with Built-In 50 Termination Interface
The IN /nIN with built-in 50 terminations accept LVDS, LVPECL,
SSTL and other differential signals. Both differential signals must
meet the V
PP
and V
CMR
input requirements. Figures 2A to 2D show
interface examples for the IN /nIN with built-in 50 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.
Figure 2A. IN/nIN Input with Built-In 50 Driven by an
LVDS Driver
Figure 2C. IN/nIN Input with Built-In 50 Driven by a
CML Driver
Figure 2B. IN/nIN Input with Built-In 50 Driven by an
SSTL Driver
Figure 2D. IN/nIN Input with Built-In 50 Driven by an
LVPECL Driver
SSTL
R1 25Ω
R2 25Ω
IN
nIN
VT
Receiver
With
Built-In
50Ω
2.5V
2.5V
Zo = 50Ω
Zo = 50Ω
