ICS889874 datasheet(9/14 Pages) ICST

9 / 14 page

889874AK

www.icst.com/products/hiperclocks.html

REV. A MAY 19, 2004

Integrated

Circuit

Systems, Inc.

ICS889874

1:2

DIFFERENTIAL-TO-LVPECL BUFFER/DIVIDER

PRELIMINARY

2.5V LVPECL INPUT WITH BUILT-IN 50

Ω

Ω TERMINATIONS INTERFACE

The IN /nIN with built-in 50

Ω terminations accepts LVDS,

LVPECL, LVHSTL, CML, SSTL and other differential signals.

Both VSWING and VOH must meet the V

PP and VCMR input

requirements.

Figures 4A to 4D show interface examples for the

HiPerClockS IN/nIN input with built-in 50

Ω terminations driven

by the most common driver types. The input interfaces sug-

gested here are examples only. If the driver is from another ven-

dor, use their termination recommendation. Please consult with

the vendor of the driver component to confirm the driver termi-

nation requirements.

FIGURE 4A. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω

Ω DRIVEN BY AN LVDS DRIVER

FIGURE 4B. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω

Ω DRIVEN BY AN LVPECL DRIVER

nIN

2.5V

LVDS

3.3V or 2.5V

Zo = 50 Ohm

Receiver

With

Built-In

50 Ohm

Zo = 50 Ohm

Receiver

With

Built-In

50 Ohm

Zo = 50 Ohm

nIN

2.5V

2.5V LVPECL

FIGURE 4E. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω

Ω DRIVEN BY AN SSTL DRIVER

FIGURE 4C. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω

Ω DRIVEN BY AN OPEN COLLECTOR

CML DRIVER

FIGURE 4D. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω

Ω DRIVEN BY A CML DRIVER

WITH

BUILT-IN 50

Ω

Ω PULLUP

Zo = 50 Ohm

2.5V

Zo = 50 Ohm

nIN

Receiver

With

Built-In

50 Ohm

2.5V

CML - Open Collector

nIN

Receiver

With

Built-In

50 Ohm

2.5V

Zo = 50 Ohm

CML - Built-in 50 Ohm Pull-up

2.5V

SSTL

nIN

Receiver With Built-In 50

Ω

Zo = 50 Ohm

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