ICS85411I Datasheet, PDF (9/16 Pages) Integrated Device Technology – LOW SKEW, 1-TO-2 DIFFERENTIAL-TOLVDS FANOUT BUFFER

ICS85411I
LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-LVDS FANOUT BUFFER
DIFFERENTIAL CLOCK INPUT INTERFACE
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL
and other differential signals. Both V and V must meet the
SWING
OH
V and V input requirements. Figures 2A to 2E show interface
PP
CMR
examples for the HiPerClockS 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. For
example in Figure 2A, the input termination applies for IDT
HiPerClockS LVHSTL drivers. If you are using an LVHSTL driver
from another vendor, use their termination recommendation.
1.8V
Zo = 50 Ohm
Zo = 50 Ohm
LVHSTL
ICS
HiPerClockS
LVHSTL Driver
3.3V
CLK
nCLK _HiPerClockS
Input
R1
R2
50
50
FIGURE 2A. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
IDT HIPERCLOCKS LVHSTL DRIVER
3.3V
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
3.3V
CLK
nCLK _HiPerClockS
Input
R1
R2
50
50
R3
50
FIGURE 2B. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
3.3V
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
3.3V
R3
R4
125
125
3.3V
CLK
nCLK _HiPerClockS
Input
R1
R2
84
84
FIGURE 2C. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
3.3V
LVPECL
3.3V
Zo = 50 Ohm
Zo = 50 Ohm
R3
R4
125 125
C1
C2
R5
100 - 200
R6
100 - 200
R1
R2
84
84
3.3V
CLK
nCLK _HiPerClockS
Input
R5,R6 locate near the driver pin.
FIGURE 2E. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER WITH AC COUPLE
3.3V
Zo = 50 Ohm
LVDS_Driv er
R1
100
Zo = 50 Ohm
3.3V
CLK
nCLK _{Receiv er}
FIGURE 2D. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVDS DRIVER
IDT^™ / ICS^™ DIFFERENTIAL-TO-LVDS FANOUT BUFFER
9
ICS85411AMI REV. B NOVEMBER 7, 2007