ICS8S89833I Datasheet, PDF (10/16 Pages) Integrated Device Technology – Four differential LVDS outputs

ICS8S89833I Data Sheet
LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-LVDS FANOUT BUFFER W/INTERNAL TERMINATION
Application 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 differential 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
Zo = 50Ω
IN
Zo = 50Ω
VT
nIN
LVDS
Figure 2A. IN/nIN Input with Built-In 50Ω
Driven by an LVDS 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 – Open Collector
IN
VT
nIN
Receiver
With
Built-In
50Ω
Figure 2C. IN/nIN Input with Built-In 50Ω
Driven by a CML Driver with Open Collector
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
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.
ICS8S89833AKI REVISION A JULY 13, 2010
10
©2010 Integrated Device Technology, Inc.