ICS841664AGI REVISION A JULY 15, 2013

10

©2013 Integrated Device Technology, Inc.

ICS841664I Data Sheet

FEMTOCLOCK® CRYSTAL-TO-HCSL CLOCK GENERATOR

Parameter Measurement Information, continued

SE Measurement Points For Absolute Cross Point/Swing

Applications Information

Recommendations for Unused Input and Output Pins

Inputs:

Crystal Inputs

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

 resistor can be tied from

XTAL_IN to ground.

REF_CLK Input

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

left floating. Though not required, but for additional protection, a 1k



resistor can be tied from the REF_CLK to ground.

LVCMOS Control Pins

All control pins have internal pullups and pulldowns; additional

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

A 1k

 resistor can be used.

Outputs:

HCSL Outputs

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.

LVCMOS Outputs

The unused LVCMOS output can be left floating. There should be no

trace attached.

= -0.30V