ICS8520I-02 Datasheet, PDF (6/13 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS8520I-02
LOW SKEW, 1-TO-16
DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER
APPLICATION INFORMATION
DIFFERENTIAL CLOCK INPUT INTERFACE
The CLKx /nCLKx 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 1A
to 1E show interface examples for the HiPerClockS CLKx/
nCLKx 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
1A, 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
3.3V
Zo = 50 Ohm
Zo = 50 Ohm
LVPECL
3.3V
CLK
nCLK _HiPerClockS
Input
R1
R2
50
50
R3
50
FIGURE 1A. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
ICS HIPERCLOCKS LVHSTL DRIVER
FIGURE 1B. 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
3.3V
Zo = 50 Ohm
LVDS_Driv er
R1
100
Zo = 50 Ohm
3.3V
CLK
nCLK _{Receiv er}
FIGURE 1C. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
FIGURE 1D. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVDS 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 1E. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER WITH AC COUPLE
8520DYI-02
www.icst.com/products/hiperclocks.html
6
REV. B NOVEMBER 16, 2005