ICS858020 datasheet(8/14 Pages) IDT

8 / 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 (3.3V)

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 2A to 2D 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.

FIGURE 2A. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY AN LVDS DRIVER

FIGURE 2B. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY AN LVPECL DRIVER

FIGURE 2D. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY A CML DRIVER

WITH

BUILT-IN 50

Ω PULLUP

3.3V

Zo = 50 Ohm

3.3V

LVDS

Receiver

With

Built-In

50 Ohm

nIN

Zo = 50 Ohm

nIN

3.3V

Zo = 50 Ohm

Receiver

With

Built-In

50 Ohm

3.3V

LVPECL

Zo = 50 Ohm

FIGURE 2E. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY AN SSTL DRIVER

3.3V

Receiver

With

Built-In

50 Ohm

Zo = 50 Ohm

nIN

3.3V

Zo = 50 Ohm

CML- Built-in 50 Ohm Pull-Up

FIGURE 2C. HIPERCLOCKS IN/nIN INPUT WITH

BUILT-IN 50

Ω DRIVEN BY A CML DRIVER

WITH

OPEN COLLECTOR

Zo = 50 Ohm

3.3V

Receiver

With

Built-In

50 Ohm

nIN

SSTL

3.3V

CML- Open Collector

nIN

Zo = 50 Ohm

Receiver

With

Built-In

50 Ohm

3.3V

Zo = 50 Ohm

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