ICS85411AMILF datasheet(9/16 Pages) IDT

9 / 16 page

IDT™ / ICS™ DIFFERENTIAL-TO-LVDS FANOUT BUFFER

ICS85411AMI REV. B NOVEMBER 7, 2007

ICS85411I

LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-LVDS FANOUT BUFFER

FIGURE 2C. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER

FIGURE 2B. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER

FIGURE 2D. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY

3.3V LVDS DRIVER

3.3V

Zo = 50 Ohm

LVPECL

Zo = 50 Ohm

HiPerClockS

CLK

nCLK

3.3V

Input

Zo = 50 Ohm

Input

HiPerClockS

CLK

nCLK

3.3V

125

Zo = 50 Ohm

3.3V

125

LVPECL

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

PP and VCMR input requirements.

Figures 2A to 2E show interface

examples for the HiPerClockS CLK/nCLK input driven by the most

common driver types. The input interfaces suggested here are

FIGURE 2A. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY

IDT HIPERCLOCKS LVHSTL DRIVER

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

Input

LVHSTL Driver

ICS

HiPerClockS

LVHSTL

3.3V

Zo = 50 Ohm

HiPerClockS

CLK

nCLK

FIGURE 2E. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER WITH AC COUPLE

Zo = 50 Ohm

125

HiPerClockS

CLK

nCLK

3.3V

100 - 200

3.3V

100 - 200

Input

R5,R6 locate near the driver pin.

Zo = 50 Ohm

125

LVPECL

Zo = 50 Ohm

100

3.3V

LVDS_Driv er

Zo = 50 Ohm

Receiv er

CLK

nCLK

3.3V

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