ics85408 Integrated Device Technology, ics85408 Datasheet - Page 8

• Manufacturer Part Number: ics85408
• Description: Differential Input Lvds Output 1 8 700-mhz Fanout Buffer
• Manufacturer: Integrated Device Technology

F
85408BG
F
D
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL
and other differential signals. Both V
V
face examples for the HiPerClockS CLK/nCLK input driven by
the most common driver types. The input interfaces suggested
F
IGURE
PP
IGURE
IGURE
IFFERENTIAL
3.3V
and V
R5,R6 locate near the driver pin.
3.3V
LVPECL
3C. H
3A. H
3E. H
1.8V
CMR
LVPECL
R5
100 - 200
LVHSTL
ICS
HiPerClockS
LVHSTL Driver
input requirements. Figures 3A to 3E show inter-
3.3V LVPECL D
ICS H
3.3V LVPECL D
I
I
I
P
P
P
C
ER
ER
ER
Zo = 50 Ohm
Zo = 50 Ohm
LOCK
R6
100 - 200
C
Zo = 50 Ohm
Zo = 50 Ohm
C
C
I
P
LOCK
Zo = 50 Ohm
Zo = 50 Ohm
LOCK
LOCK
ER
C
I
S CLK/
NPUT
S CLK/
LOCK
S CLK/
RIVER
S LVHSTL D
RIVER WITH
R1
50
3.3V
R3
125
C1
C2
I
R1
84
NTERFACE
SWING
N
N
N
CLK I
CLK I
CLK I
3.3V
R3
125
R2
50
R4
125
R1
84
R2
84
and V
CLK
nCLK
R4
125
NPUT
R2
84
AC C
NPUT
NPUT
CLK
nCLK
3.3V
OH
3.3V
RIVER
HiPerClockS
Input
must meet the
HiPerClockS
Input
D
D
D
OUPLE
CLK
nCLK
RIVEN BY
RIVEN BY
RIVEN BY
3.3V
HiPerClockS
Input
D
IFFERENTIAL
8
F
here are examples only. Please consult with the vendor of the
driver component to confirm the driver termination requirements.
For example in Figure 3A, the input termination applies for ICS
HiPerClockS LVHSTL drivers. If you are using an LVHSTL driver
from another vendor, use their termination recommendation.
F
IGURE
IGURE
3.3V
3.3V
3D. H
3B. H
LVDS_Driv er
-
LVPECL
TO
3.3V LVDS D
3.3V LVPECL D
-LVDS C
I
I
P
P
Zo = 50 Ohm
Zo = 50 Ohm
ER
ER
C
C
LOCK
LOCK
Zo = 50 Ohm
Zo = 50 Ohm
S CLK/
S CLK/
LOCK
RIVER
R1
50
RIVER
R3
50
L
N
N
D
R2
50
CLK I
CLK I
OW
R1
100
ISTRIBUTION
CLK
nCLK
ICS85408
3.3V
S
REV. A DECEMBER 6, 2007
NPUT
NPUT
HiPerClockS
KEW
Input
CLK
nCLK
D
D
3.3V
, 1-
RIVEN BY
RIVEN BY
Receiv er
C
TO
HIP
-8