9©2016 Integrated Device Technology, Inc Revision A February 9, 2016
8S89875I Data Sheet
Applications Information
Recommendations for Unused Input Pins
Inputs:
LVCMOS Select Pins
All control pins have internal pullups; additional resistance is not
required but can be added for additional protection. A 1k resistor
can be used.
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,
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 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 LVPECL Driver
Figure 2D. IN/nIN Input with Built-In 50
Driven by a CML Driver with Built-In 50
Pullup
