ICS854S1208I Datasheet, PDF (13/19 Pages) Integrated Device Technology – Eight differential LVDS output pairs

ICS854S1208I Data Sheet
DIFFERENTIAL-TO-LVDS FANOUT BUFFER W/DIVIDER AND GLITCHLESS SWITCH
2.5V Differential Clock Input Interface
The CLK /nCLK accepts LVDS, LVPECL, HCSL and other differential
signals. Both signals must meet the V_PP and V_CMR input
requirements. Figures 4A to 4D show interface examples for the
CLK/nCLK input driven by the most common driver types. The input
interfaces suggested here are examples only. Please consult with the
vendor of the driver component to confirm the driver termination
requirements.
2.5V
LVPECL
Zo = 50Ω
Zo = 50Ω
2.5V
R3
250Ω
R4
250Ω
2.5V
CLK
R1
62.5Ω
R2
62.5Ω
nCLK
Differential
Input
Figure 4A. CLK/nCLK Input Driven by a
2.5V LVPECL Driver
2.5V
LVPECL
Zo = 50Ω
Zo = 50Ω
2.5V
CLK
R1
R2
50Ω
50Ω
nCLK
Differential
Input
R3
18Ω
Figure 4B. CLK/nCLK Input Driven by a
2.5V LVPECL Driver
2.5V
2.5V
*R3 33Ω
Zo = 50Ω
Zo = 50Ω
*R4 33Ω
HCSL
R1
50Ω
*Optional – R3 and R4 can be 0Ω
CLK
nCLK
R2
50Ω
Differential
Input
2.5V
LVDS
Zo = 50Ω
Zo = 50Ω
2.5V
R1
100Ω
CLK
nCLK
Differential
Input
Figure 4C. CLK/nCLK Input Driven by a 2.5V HCSL Driver Figure 4D. CLK/nCLK Input Driven by a 2.5V LVDS Driver
ICS854S1208AYI REVISION A APRIL 27, 2012
13
©2012 Integrated Device Technology, Inc.