ICS525-01/02

OSCaR™ User Configurable Clock

MDS 525-01/02 I

5

Revision 071100

Printed 11/13/00

Integrated Circuit Systems, Inc. • 525 Race Street •San Jose• CA • 95126•(408) 295-9800tel• www.icst.com

The dividers are expressed as integers, so that if a 66.66 MHz output is desired from a 14.31818 input, the

Reference Divider Word (RDW) should be 59, and the VCO Divider Word (VDW) should be 276, with

an Output divider (OD) of 2. In this example, R6:R0 is 0111011, V8:V0 is 100010100, and S2:S0 is 001.

Since all of these inputs have pull-up resistors, it is only necessary to ground the zero pins, namely V7, V6,

V5, V3, V1, V0, R6, R2, S2, and S1.

To determine the best combination of VCO, reference, and output divider, use the ICS525 Calculator on

our Web site: http://www.icst.com/products/ics525inputForm.html. This online form is easy to use and

quickly shows you up to three options for these settings.

You may also fax this page to MicroClock/ICS at 408 295 9818(fax), or contact us via our website at

www.icst.com. Be sure to indicate the following:

Your Name ________________ Company Name___________________ Telephone_________________

Respond by e-mail (list your e-mail address) __________________or fax number ___________________

Desired input crystal/clock (in MHz) _______________ Desired output frequency________________

VDD = 3.3V or 5V ___________

Duty Cycle: 40-60% _______ or 45-55% required________