ICS85211AMIT datasheet(6/12 Pages) ICST

6 / 12 page

85211AMI

www.icst.com/products/hiperclocks.html

REV. B ARPIL 8, 2003

Integrated

Circuit

Systems, Inc.

ICS85211I

LOW SKEW, 1-TO-2

DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER

CLOCK INPUT INTERFACE

The CLK /nCLK accepts differential input signals of both V

SWING

and V

OH to meet the VPP and VCMR input requirements. Figures 3 to

6 show interface examples for the ICS85211I clock input driven

by most common driver types. The input interfaces suggested

here are examples only. Please consult with the vendor of the

FIGURE 3. ICS85211I CLK/NCLK INPUT DRIVEN BY

HIPERCLOCKS LVHSTL DRIVER

1.8V

Input

LVHSTL Driver

ICS

HiPerClockS

LVHSTL

3.3V

Zo = 50 Ohm

HiPerClockS

CLK

nCLK

driver components to confirm the driver termination requirement.

For example in

Figure 3, the input termination applies for ICS

HiPerClockS LVHSTL drivers. If you are using an LVHSTL driver

from another vendor, use their termination recommendation.

FIGURE 4. ICS85211I CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER (INTERFACE 1)

FIGURE 5. ICS85211I CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER (INTERFACE 2)

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

FIGURE 6. ICS85211I CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER WITH AC COUPLE

125

LVPECL

HiPerClockS

CLK

nCLK

R5,R6 loc ate near the driv er pin.

Zo = 50 Ohm

3.3V

125

100-200

Zo = 50 Ohm

100-200

3.3V

Input

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