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ICS307M-01 Datasheet(PDF) 3 Page - Integrated Circuit Systems |
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ICS307M-01 Datasheet(HTML) 3 Page - Integrated Circuit Systems |
3 / 8 page ICS307 Serially Programmable Clock Source MDS 307 D 3 Revision 042501 Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel •www.icst.com Determining the Output Frequency On power-up the ICS307-01 on-chip registers can have random values, so almost any frequency may be output from the part. CLK1 will always have some clock signal present, but CLK2 could possibly be OFF (low). The ICS307-02 on-chip registers are initially configured to provide a x1 output clock on both the CLK1 and CLK2 outputs. The output frequency will be the same as the input clock or crystal. This is useful if the ICS307 will provide the initial system clock at power-up. Since this feature is an advantage in most systems, the ICS307-02 is recommended for new designs. With programming, the user has full control in changing the desired output frequency to any value over the range shown in Table 1 on page 4. The output of the ICS307 can be determined by the following simple equation: To determine the best combination of VCO, reference, and output dividers, contact ICS application engineering. You may also fax this page to ICS at 408 295 9818(fax). 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_______ or clock_______ (in MHz) Desired output frequency_______________ REF Output_______VDD = 3.3V or 5V _______ Duty Cycle: 40-60% _____ or 45-55% required____ CLK1 frequency = Input frequency • 2 • (VDW+8) (RDW+2)(OD) Also, the following operating ranges should be observed: 55 MHz < Input frequency • 2 • (VDW+8) (RDW+2) < 400 MHz 200 kHz < Input Frequency (RDW+2) Where VCO Divider Word (VDW) = 4 to 511 (0, 1, 2, 3 are not permitted) Reference Divider Word (RDW) = 1 to 127 (0 is not permitted) Output Divider = values on page 4 Commercial temperature range. Industrial temperature limits are 60 MHz to 360 MHz. |
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