AdaWiki

Notes on crystals:

• Crystals are high precision timekeeping devices - much better than resonators - but are more $ and may require capacitors
• Frequencies may vary with temperature and the capacitors used
• In general we'll have the larger/cheaper packages
• If you need to have matching capacitors, pick ones a couple pF smaller than double the load capacitance rated. For example, a 12.5pF clock crystal would take ~20pF caps

Image	Description	Part # and datasheet	Distributors	Eagle lib.
	32.768 KHz (12.5pF) for timekeeping	Generic	Digikey Mouser	crystal:TC38H
	5.0000 MHz in HC-49 package	Generic	Digikey Mouser	crystal:HC49
	3.579545 MHz ("colorburst") crystal	Generic	Digikey Mouser	crystal:HC49
either CYL or HC49	28.63636MHz Crystal	Generic	Digikey Mouser	crystal:TC38H

Notes on Resonators:

• Resonators are reasonable-precision timekeeping devices - not as good as crystals but better than RC oscillators. Cheap & easy to use
• Frequencies may vary with temperature and voltage used
• Theres a couple manufacturers so we have multiple links
• They have built in capacitors so just connect middle pin to ground and the outer two to the crystal pins of your oscillator

Image	Description	Part # and datasheet	Distributors	Eagle Lib.
	16.00 MHz ceramic oscillator with caps	ZTT-16.00 AWCR-16.00MD CSTLS16M0X55	Digikey Digikey Mouser Mouser	Adafruit:CERMOSCILL
	8.00 MHz ceramic oscillator with caps	ZTT-8.00 AWCR-8.00MD CSTLS8M0X55	Digikey Digikey Mouser Mouser Mouser	Adafruit:CERMOSCILL
	12.00 MHz ceramic oscillator with caps	ZTT-12	Mouser Digikey	Adafruit:CERMOSCILL