
83023AMI
www.idt.com
REV. B JULY 29, 2010
8
ICS83023I
DUAL, 1-TO-1
DIFFERENTIAL-TO-LVCMOS TRANSLATOR/BUFFER
FIGURE 2C. CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
FIGURE 2B. CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
FIGURE 2D. CLK/nCLK INPUT DRIVEN BY
3.3V LVDS DRIVER
3.3V
R1
50
R3
50
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
HiPerClockS
CLK
nCLK
3.3V
Input
R2
50
Zo = 50 Ohm
Input
HiPerClockS
CLK
nCLK
3.3V
R3
125
R2
84
Zo = 50 Ohm
3.3V
R4
125
LVPECL
R1
84
3.3V
DIFFERENTIAL CLOCK INPUT INTERFACE
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL,
HCSL and other differential signals. Both V
SWING and VOH must
meet the V
PP and VCMR input requirements. Figures 2A to 2E
show interface examples for the CLK/nCLK input driven by
the most common driver types. The input interfaces suggested
FIGURE 2A. CLK/nCLK INPUT DRIVEN BY
LVHSTL DRIVER
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 LVHSTL drivers. If you are using an LVHSTL driver
from another vendor, use their termination recommendation.
1.8V
R2
50
Input
LVHSTL Driver
ICS
HiPerClockS
R1
50
LVHSTL
3.3V
Zo = 50 Ohm
HiPerClockS
CLK
nCLK
FIGURE 2E. CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER WITH AC COUPLE
Zo = 50 Ohm
R3
125
HiPerClockS
CLK
nCLK
3.3V
R5
100 - 200
3.3V
R2
84
3.3V
R6
100 - 200
Input
R5,R6 locate near the driver pin.
Zo = 50 Ohm
R1
84
R4
125
C2
LVPECL
C1
Zo = 50 Ohm
R1
100
3.3V
LVDS_Driv er
Zo = 50 Ohm
Receiv er
CLK
nCLK
3.3V