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527R-01ILF Datasheet(PDF) 4 Page - Integrated Device Technology |
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527R-01ILF Datasheet(HTML) 4 Page - Integrated Device Technology |
4 / 11 page ICS527-01 CLOCK SLICER USER CONFIGURABLE ZERO DELAY BUFFER ZDB AND MULTIPLIER/DIVIDER IDT™ / ICS™ CLOCK SLICER USER CONFIGURABLE ZERO DELAY BUFFER 4 ICS527-01 REV G 051310 because of internal pull-ups) during Printed Circuit Board layout, so the ICS527-01 automatically produces the correct clock when all components are soldered. It is also possible to connect the inputs to parallel I/O ports in order to switch frequencies. The output of the ICS527-01 can be determined by the following simple equation: Where: Reference Divider Word (RDW) = 0 to 127 Feedback Divider Word (FDW) = 0 to 127 FB Frequency is the same as either CLK1 or CLK2 depending on feedback connection Also, the following operating ranges should be observed: S1 and S0 should be set for the frequency of CLK1, according to the Frequency Range Table on page 2. The device can be operated below the lower limits stated in table 2, however, jitter and skew may be higher. Therefore, if your expected output frequency covers more than one frequency range, use the setting for the highest frequency expected. The dividers are expressed as integers. For example, if a 50 MHz output on CLK1 is desired from a 40 MHz input, the reference divider word (RDW) should be 2 and the feedback divider word (FDW) should be 3 which gives the required 5/4 multiplication. Then R6:R0 is 0000010, F6:F0 is 0000011 and S1:S0 is 00. Also, this example assumes CLK1 is connected to FBIN.S1:S0 is set by referring to the Frequency Range Table. The setting for 50 MHz is 00. For assistance with configuring the device, please send a description of your requirements using the “Technical Support” link at www.idt.com. FB Frequency Input Frequency FDW 2 + RDW 2 + ------------------------ × = 300kHz Input Frequency RDW 2 + ------------------------------------------- < |
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