ICS85408BGLF datasheet(8/12 Pages) ICST

Part #	ICS85408BGLF

Description	LOW SKEW, 1-TO-8 DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP

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Manufacturer	ICST [Integrated Circuit Systems]

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8 / 12 page

85408BG

www.icst.com/products/hiperclocks.html

REV. A APRIL 25, 2005

8

Integrated

Circuit

Systems, Inc.

ICS85408

LOW SKEW, 1-TO-8

DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP

FIGURE 3C. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER

FIGURE 3B. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER

FIGURE 3D. HIPERCLOCKS 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 3A to 3E show inter-

face examples for the HiPerClockS CLK/nCLK input driven by

the most common driver types. The input interfaces suggested

FIGURE 3A. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY

ICS HIPERCLOCKS 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 3A, 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

R2

50

Input

LVHSTL Driver

ICS

HiPerClockS

R1

50

LVHSTL

3.3V

Zo = 50 Ohm

HiPerClockS

CLK

nCLK

FIGURE 3E. HIPERCLOCKS 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

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