ICS852911I Datasheet, PDF (8/15 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-HSTL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS852911I
LOW SKEW, 1-TO-9
DIFFERENTIAL-TO-HSTL FANOUT BUFFER
LVPECL CLOCK INPUT INTERFACE
The PECL_CLK/nPECL_CLK accepts LVPECL, CML, SSTL
and other differential signals. Both V_SWING and V_OH must meet
the V_PP and V_CMR input requirements. Figures 3A to 3E show
interface examples for the HiPerClockS PECL_CLK/
nPECL_CLK input driven by the most common driver types.
The input interfaces suggested here are examples only. If the
driver is from another vendor, use their termination recom-
mendation. Please consult with the vendor of the driver com-
ponent to confirm the driver termination requirements.
3.3V
CML
Zo = 50 Ohm
Zo = 50 Ohm
3.3V
R1
R2
50
50
3.3V
PCLK
nPCLK _HiPerClockS
PCLK/nPCLK
FIGURE 3A. HIPERCLOCKS PECL_CLK/nPECL_CLK
INPUT DRIVEN BY A CML DRIVER
2.5V
SSTL
Zo = 60 Ohm
Zo = 60 Ohm
2.5V
R3
R4
120
120
3.3V
PCLK
R1
R2
120
120
nPCLK
HiPerClockS
PCLK/nPCLK
FIGURE 3B. HIPERCLOCKS PECL_CLK/nPECL_CLK
INPUT DRIVEN BY AN SSTL DRIVER
3. 3V
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
3. 3V
R3
R4
125
125
3.3V
PCLK
nPCLK _HiPerClockS
I nput
R1
R2
84
84
3.3V
LVDS
Zo = 50 Ohm
R5
100
Zo = 50 Ohm
3.3V
3.3V
R3
R4
1K
1K
C1
PCLK
C2
nPCLK
HiPerClockS
PCLK/nPCLK
R1
R2
1K
1K
FIGURE 3C. HIPERCLOCKS PECL_CLK/nPECL_CLK
INPUT DRIVEN BY A 3.3V LVPECL DRIVER
FIGURE 3D. HIPERCLOCKS PECL_CLK/nPECL_CLK
INPUT DRIVEN BY A 3.3V LVDS DRIVER
3.3V
3.3V LVPECL
3.3V
Zo = 50 Ohm
R3
R4
84
84
C1
Zo = 50 Ohm
C2
R5
R6
100 - 200 100 - 200
R1
R2
125 125
3.3V
PCLK
nPCLK _HiPerClockS
PCLK/nPCLK
FIGURE 3E. HIPERCLOCKS PECL_CLK/nPECL_CLK
INPUT DRIVEN BY A 3.3V LVPECL DRIVER
WITH AC COUPLE
852911AVI
www.icst.com/products/hiperclocks.html
8
REV. A MAY 23, 2005