525-01R(2000) データシートの表示（PDF） - Integrated Circuit Systems
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525-01R Datasheet PDF : 8 Pages
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ICS525-01/02
OSCaR™ User Configurable Clock
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________
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
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