参数资料
型号: DS1075M-60
厂商: MAXIM INTEGRATED PRODUCTS INC
元件分类: XO, clock
英文描述: 60 MHz, OTHER CLOCK GENERATOR, PDIP8
封装: 0.300 INCH, DIP-8
文件页数: 16/18页
文件大小: 251K
代理商: DS1075M-60
DS1075
7 of 18
Figure 5
Figure 6
SELECT TIMING
If the PDN bit is set to “0”, the PDN / SELX pin can be used to switch between the internal oscillator and
an externalor crystal reference. The “Enabling Sequencer” is again employed to ensure this transition
occurs in a glitch-free fashion. Two asynchronous clock signals are involved, INTCLK is the internal
reference oscillator divided by one or whatever value of M is selected. EXTCLK is the clock signal fed
into the OSCIN pin, or the clock resulting from a crystal connected between OSCIN and XTAL. The
behavior of OUT0 is described in the following paragraphs, the OUT pin will behavior similarly but will
be divided by N.
FROM INTERNAL TO EXTERNAL CLOCK
This is accomplished by a high to low transition on the SELX pin. This transaction is detected on the
falling edge of INTCLK. The output OUT0 will be held low for a minimum of half the period of
INTCLK (tI/2), then if EXTCLK is low it will be routed through to OUT0. If EXTCLK is high the
switching will not occur until EXTCLK returns to a low level.
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