211AI01L datasheet(7/13 Pages) ICST

7 / 13 page

85211AMI-01

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 1, 2005

Integrated

Circuit

Systems, Inc.

ICS85211I-01

LOW SKEW, 1-TO-2

DIFFERENTIAL-TO-HSTL 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 3A

to 3D show interface examples for the ICS85211I-01 clock input

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

gested here are examples only. Please consult with the vendor

FIGURE 3A. ICS85211I-01 CLK/NCLK INPUT DRIVEN BY

HIPERCLOCKS HSTL DRIVER

1.8V

Input

LVHSTL Driver

ICS

HiPerClockS

LVHSTL

3.3V

Zo = 50 Ohm

HiPerClockS

CLK

nCLK

of the driver components to confirm the driver termination require-

ment. For example in Figure 3, the input termination applies for

ICS HiPerClockS HSTL drivers. If you are using an HSTL driver

from another vendor, use their termination recommendation.

FIGURE 3B. ICS85211I-01 CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER (INTERFACE 1)

FIGURE 3C. ICS85211I-01 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 3D. ICS85211I-01 CLK/NCLK INPUT DRIVEN BY

3.3V LVPECL DRIVER WITH AC COUPLE

125

LVPECL

HiPerClockS

CLK

nCLK

R5,R6 locate near the driv er pin.

Zo = 50 Ohm

3.3V

125

100-200

Zo = 50 Ohm

100-200

3.3V

Input

RECOMMENDATIONS FOR UNUSED OUTPUT PINS

OUTPUTS:

HSTL OUTPUT

All unused HSTL outputs can be left floating. We recommend

that there is no trace attached. Both sides of the differential

output pair should either be left floating or terminated.

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