ICS8547 Datasheet, PDF (9/12 Pages) Integrated Circuit Systems – HEX, LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-LVDS CLOCK BUFFERS

Integrated
Circuit
Systems, Inc.
ICS8547
HEX, LOW SKEW, 1-TO-2
DIFFERENTIAL-TO-LVDS CLOCK BUFFERS
DIFFERENTIAL CLOCK INPUT INTERFACE
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL
and other differential signals. Both V_SWING and V_OH must meet the
V_PP and V_CMR input requirements. Figures 2 to 5 show interface
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 com-
ponent to confirm the driver termination requirements. For ex-
ample in Figure 2, the input termination applies for ICS
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 2. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
ICS 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 3. 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 4. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
3.3V
LVPECL
Zo = 50 Ohm
Zo = 50 Ohm
3.3V
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 5. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER WITH AC COUPLE
ICS8547AY
www.icst.com/products/hiperclocks.html
9
REV. A FEBRUARY 4, 2003