ICS8520I-02 datasheet(6/13 Pages) ICST

Part #	ICS8520I-02

Description	LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER

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Manufacturer	ICST [Integrated Circuit Systems]

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6 / 13 page

8520DYI-02

www.icst.com/products/hiperclocks.html

REV.B NOVEMBER 16, 2005

6

Integrated

Circuit

Systems, Inc.

ICS8520I-02

LOW SKEW, 1-TO-16

DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER

FIGURE 1C. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER

FIGURE 1B. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER

FIGURE 1D. 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 CLKx /nCLKx 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 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

FIGURE 1A. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY

ICS HIPERCLOCKS LVHSTL DRIVER

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

R2

50

Input

LVHSTL Driver

ICS

HiPerClockS

R1

50

LVHSTL

3.3V

Zo = 50 Ohm

HiPerClockS

CLK

nCLK

Zo = 50 Ohm

R1

100

3.3V

LVDS_Driv er

Zo = 50 Ohm

Receiv er

CLK

nCLK

3.3V

FIGURE 1E. 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

APPLICATION INFORMATION

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ICS8520I-02 Datasheet(PDF) 6 Page - Integrated Circuit Systems

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