Integrated dithered master oscillator

Those of you designing around the 80C400 or 80C390 CPUs:

Dallas/MAXIM is soon to release the DS1087 dithered oscillator at 18.432
MHz, +/- 2% dither. The part numbers will be:

Bulk parts        DS1087LU-4CL
T&R Parts         DS1087LU-4CL/T&R

If you use the DS1087LU in place of the crystal and caps in your design,
the frequency of all the clocks in the system will vary +/- 2%, which
reduces FCC/CE peak emissions by 10:1 or more. The dither is not enough
to cause a problem for serial communications even at 115200 baud. I am
using this oscillator in my '400 based 74MHz system and doing RS485 at
115200 baud with no problems at all. The center frequency is accurate to
within 1%. Since the TINI system uses an external real time clock,
time-of-day timing is not an issue.

Check out the data sheet at:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3942

Chris

BTW: I still have four new 72-pin TINIs (latest Rev, 1M RAM) for sale,
now at $50 each + $5 shipping. Write me off-list at [email protected]
if you are interested.


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