844002AGI-01

www.icst.com/products/hiperclocks.html

REV. A JANUARY 5, 2006

8

Integrated

Circuit

Systems, Inc.

ICS844002I-01

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

resistor can be tied from XTAL_IN to ground.

For applications not requiring the use of the reference clock,

it can be left floating. Though not required, but for additional

protection, a 1k

Ω resistor can be tied from the REF_CLK to

ground.

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

resistance is not required but can be added for additional

protection. A 1k

Ω resistor can be used.

LVDS

All unused LVDS output pairs can be either left floating or

terminated with 100

Ω across. If they are left floating, we

recommend that there is no trace attached.

transmission line environment. For buffer with multiple LDVS

driver, it is recommended to terminate the unused outputs.

Figure 3 shows a typical termination for LVDS driver in

characteristic impedance of 100

Ω differential (50Ω single)

2.5V

100 Ohm Differential Transmission Line

2.5V

LVDS_Driv er

R1

100

+

-

100

Ω

Ω

Ω

Ω

Ω Differential Transmission Line