ICS858020 datasheet(7/14 Pages) IDT

7 / 14 page

858020AK

REV. A DECEMBER 10, 2007

ICS858020

LOW SKEW, 1-TO-4

DIFFERENTIAL-TO-CML FANOUT BUFFER

LVPECL INPUT WITH BUILT-IN 50

Ω TERMINATION INTERFACE (2.5V)

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

IH and VIL input require-

ments. Figures 1A to 1D 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

vendor, use the termination they recommend. Please consult

with the vendor of the driver component to confirm the driver

termination requirements.

APPLICATION INFORMATION

FIGURE 1A. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY AN LVDS DRIVER

FIGURE 1B. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

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 1E. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY AN SSTL DRIVER

FIGURE 1C. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY AN OPEN COLLECTOR

CML DRIVER

FIGURE 1D. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY A CML DRIVER

WITH

BUILT-IN 50

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

Zo = 50 Ohm

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