ICS874004 datasheet(7/10 Pages) ICST

7 / 10 page

Integrated

Circuit

Systems, Inc.

874004AG

www.icst.com/products/hiperclocks.html

REV. A JANUARY 21, 2005

ICS874004

PCI EXPRESS™

JITTER ATTENUATOR

PRELIMINARY

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

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 3A to 3D 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

Input

LVHSTL Driver

ICS

HiPerClockS

LVHSTL

3.3V

Zo = 50 Ohm

HiPerClockS

CLK

nCLK

Zo = 50 Ohm

100

3.3V

LVDS_Driv er

Zo = 50 Ohm

Receiv er

CLK

nCLK

3.3V

LVDS DRIVER TERMINATION

A general LVDS interface is shown in

Figure 4. In a 100

Ω

differential transmission line environment, LVDS drivers

require a matched load termination of 100

Ω across near

100 Ohm Differiential Transmission Line

100

3.3V

LVDS_Driv er

3.3V

FIGURE 4. TYPICAL LVDS DRIVER TERMINATION

the receiver input. For a multiple LVDS outputs buffer, if only

partial outputs are used, it is recommended to terminate the

un-used outputs.

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