ICS8S89832I Datasheet, PDF (9/16 Pages) Integrated Device Technology – Four differential LVDS output pairs

ICS8S89832I 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 100Ω across. If they are left floating, we recommend that there
is no trace attached.
LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-LVDS FANOUT BUFFER
2.5V LVPECL Input with Built-In 50Ω Termination Interface
The IN /nIN with built-in 50Ω 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 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 2A. IN/nIN Input with Built-In 50Ω Driven by an
LVDS Driver
2.5V
2.5V
R1
25
SSTL ^R2
25
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
Receiver
With
Built-In
50Ω
Figure 2B. IN/nIN Input with Built-In 50Ω Driven by an
SSTL Driver
2.5V
2.5V
2.5V
2.5V
CML
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
Receiver
With
Built-In
50Ω
LVPECL
Zo = 50Ω
Zo = 50Ω
IN
VT
nIN
R1
18
Receiver
With
Built-In
50Ω
Figure 2C. IN/nIN Input with Built-In 50Ω Driven by a CML Figure 2D. IN/nIN Input with Built-In 50Ω Driven by an
Driver
LVPECL Driver
ICS8S89832AKI REVISION A JANUARY 11, 2010
9
©2010 Integrated Device Technology, Inc.