參數(shù)資料
型號: ICS527R-01IT
英文描述: Clock Slicer⑩ User Configurable Zero Delay Buffer
中文描述: ⑩時鐘切片機用戶可配置零延遲緩沖器
文件頁數(shù): 3/8頁
文件大?。?/td> 113K
代理商: ICS527R-01IT
ICS527-01
Clock Slicer
User Configurable Zero Delay Buffer
MDS 527-01 B
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126(408)295-9800tel www.icst.com
3
Revision 020801
Using the Clock Slicer
First use DIV2 to select the function of the CLK2 output. If DIV2 is high, a divide-by-2, low skew version
of CLK1 is present on CLK2. If DIV2 is low, a SYNC pulse is generated on CLK2. The SYNC pulse goes
high synchronously with the rising edges of ICLK and CLK1 that are de-skewed. The SYNC function
operates at CLK1 frequencies up to 66 MHz. If neither CLK1/2 or a SYNC pulse are required, then CLK2
should be disabled by connecting OECLK2 to ground, which will also give the lowest jitter on CLK1.
Next, the feedback scheme should be chosen. If CLK2 is being used as a SYNC or is tri-stated, then CLK1
must be connected to FBIN. If CLK2 is selected to be CLK1 divided-by-2 (DIV2 = 1, OECLK2 = 1),
then either CLK1 or CLK2 must be connected to FBIN. The choice between CLK1 or CLK2 is illustrated
by the following example where the device has been configured to generate CLK1 that is twice the
frequency on ICLK.
ICLK
CLK1
CLK2
ICLK
CLK1
CLK2
CLK1 Feedback
CLK2 Feedback
Using CLK1 as the feedback will always result in synchronized rising edges between ICLK and CLK1. But
CLK2 could be a falling edge compared with ICLK. Therefore, wherever possible, we recommend the use
of CLK2 feedback. This will synchronize the rising edges of all 3 clocks.
More complicated feedback schemes can be used, such as incorporating multiple output buffers in the
feedback path. An example of this is given later in the datasheet. The fundamental property of the
ICS527-01 is that it aligns rising edges on ICLK and FBIN at a ratio determined by the reference and
feedback dividers.
Lastly, the divider settings should be selected. The following section describes how the dividers can be set.
The drive strength is selected by the 2XDRIVE pin. If high drive strength is not required, we recommend
tying this pin low.
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