ICS8523CGI REVISION E NOVEMBER 15, 2012

11

©2012 Integrated Device Technology, Inc.

ICS8523I Data Sheet

LOW SKEW, 1-TO-4, DIFFERENTIAL-TO-HSTL FANOUT BUFFER

Recommendations for Unused Input and Output Pins

Inputs:

LVCMOS Control Pins

All control pins have internal pull-ups or pull-downs; additional

resistance is not required but can be added for additional protection.

A 1k

 resistor can be used.

CLK/nCLK Inputs

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

 resistor can be tied from CLK to ground.

PCLK/nPCLK Inputs

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

 resistor can be tied from PCLK to

ground.

Outputs:

HSTL Outputs

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.

HSTL Output Termination

VDDO

Zo = 50

HSTL

+

-

ICS HiPerClockS

VDD

R2

50

R1

50

Zo = 50

HSTL

HSTL Driv er