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MSP430F5329: Driving the XT2IN Clock Pin at 20MHz

Part Number: MSP430F5329
Other Parts Discussed in Thread: MSP-TS430PN80A, MSP-EXP430F5529

When driving the XT2IN with a crystal oscillator, what are the duty cycle specifications and the rise/fall times required?  Our existing oscillator is 20MHz with a 45% to 55% duty cycle and a 5nsec rise/fall times (when driving a 15pF).  A replacement oscillator is the same except the rise/fall times are 10nsec (when driving15pF).  Will this alternate crystal oscillator work with the MSP4305329?  Is there a minimum high time for the clock?  Is there a minimum low time for the clock?

  • Hello Donn,

    We do not specify the minimum high and low times, but we do have the duty cycle specified(40% - 60%).  See section 8.16 of the datasheet.  

  • Thanks for the quick response.  This helps.  Further, 

    This increases my confidence in the alternate oscillator.  I still have some concerns since the 40% to 60% is encroached upon by the "production" component substitution.

    Do you know if there is a list of oscillators that have been successfully used with this TI processor?  Previous successful use would further increase my confidence in the alternate component selection.  I trust it will work but this change is on a production run so whatever assurance I can get will help.

  • Donn,

    We don't have a list of oscillators, but we can reference oscillators that have been successfully used on our evaluation boards.  I have listed a couple below, but was unable to find a reference board using 20MHz.  Hope this helps.

    MSP-TS430PN80A Target socket Board - Q2: 4MHz Buerklin: 78D134 

    MSP-EXP430F5529 - 4MHz QUARTZ HC49 4P-1