ICS853011BMLF datasheet(10/16 Pages) ICST

10 / 16 page

853011BM

www.icst.com/products/hiperclocks.html

REV. C JULY 13, 2005

Integrated

Circuit

Systems, Inc.

ICS853011

LOW SKEW, 1-TO-2

DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER

INPUTS:

CRYSTAL INPUT:

For applications not requiring the use of the crystal oscillator

input, both XTAL_IN and XTAL_OUT can be left floating. Though

not required, but for additional protection, a 1k

Ω resister can be

tied from XTAL_IN to ground.

CLK INPUT:

For applications not requiring the use of the test clock, it can be

left floating.Though not required, but for additional protection, a

Ω resister can be tied from the CLK input to ground.

TEST_CLK INPUT:

For applications not requiring the use of the test clock, it can be

left floating.Though not required, but for additional protection, a

Ω resister can be tied from the TEST_CLK to ground.

CLK/nCLK INPUT:

For applications not requiring the use of the differential input,

both CLK and nCLK can be left floating. Though not required,

but for additional protection, a 1k

Ω resister can be tied from CLK

to ground.

PCLK/nPCLK INPUT:

For applications not requiring the use of a differential input, both

the PCLK and nPCLK pins can be left floating. Though not

required, but for additional protection, a 1k

Ω resister can be tied

from PCLK to ground.

SELECT PINS:

All select pins have internal pull-ups and pull-downs; additional

resistance is not required but can be added for additional

protection. A 1k

Ω resister can be used.

RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS

OUTPUTS:

LVCMOS OUTPUT:

All unused LVCMOS output can be left floating.We recommend

that there is no trace attached.

LVPECL OUTPUT

All unused LVPECL 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.

LVHSTL OUTPUT

All unused LVHSTL 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.

LVDS OUTPUT

All unused LVDS outputs should be terminated with 100

Ω resister

between the differential pair.

LVDS – Like OUTPUT

All unused LVDS 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.

HCSL OUTPUT

All unused HCSL 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.

SSTL OUTPUT

All unused SSTL 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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