On Nov 26, 2010, at 7:08 PM, Funny NYPD wrote:

>> I actually thought HC49 SMD takes less
>> space than Ceramic resonator or they should be very close on PCB real
>> estate. Am I wrong?

Nowdays you can get "very small" devices in both crystal and resonator =20
style.
Far smaller than HC49 footprints.

The latest version of the Arduino board ("uno") adds a dual-footprint =20
for an SMT resonator to the old-style HC49 crystal.  The resonator =20
fits entirely between the pins of the crystal, and doesn't require =20
caps; it's MUCH smaller.  (OTOH, there are much smaller-than-HC49 =20
crystals available as well.)

http://arduino.cc/en/uploads/Main/ArduinoUnoFront.jpg

(shows one of each; crystal for the USB converter, resonator next the =20
the main cpu.)

BillW

--=20
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