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Crystal 12MHz
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Price: $1.99
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Sparkfun Item #: COM-08582 -

Standard frequency crystals - use these crystals to provide a clock input to your microprocessor. Rated at 20pF capacitance and +/- 50ppm stability. Low profile HC49/US Package. 12MHz is good for use with devices that need USB.

Crystal 16MHz
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Price: $1.77
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Sparkfun Item #: COM-00536 -

Standard frequency crystals - use these crystals to provide a clock input to your microprocessor. Rated at 20pF capacitance and +/- 50ppm stability. Low profile HC49/US Package.

Crystal 32kHz
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Price: $2.66
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Sparkfun Item #: COM-00540 -

Standard 'Watch' or Real-Time-Clock crystal. 32.768kHz means it is precisely half of a 16-bit counter. Start counting at 0x8000 (or 32768). When the counter rolls over from 65535 to 0, then you know that exactly one second has passed. Reset the interrupt, reset the counter, and start counting again! Rated at 12.5pF load capacitance, 35K ohm max (18K ohm typical) series resistance, and +/- 20ppm stability. Small cylinder package.

Crystal 4MHz
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Price: $1.77
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Sparkfun Item #: COM-00539 -

Standard frequency crystals - use these crystals to provide a clock input to your microprocessor. Rated at 20pF capacitance and +/- 50ppm stability. Low profile HC49/US Package.

Crystal SMD 16MHz
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Price: $2.66
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Sparkfun Item #: COM-00094 -

These are very small surface mount quartz crystals used where size is a concern. Ideal for use with the nRF2401 ICs. 2****0ppm * 18pF load capacitance Features: Small 5x3.2mm footprint Operating temperature: -20°C ~ +70°C Frequency Tolerance: +/- Documents: Datasheet ...

Crystal SMD 24MHz
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Price: $1.77
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Sparkfun Item #: COM-08581 -

These are very small surface mount quartz crystals used where size is a concern. 24MHz for maximum speed. Note: The datasheet below is a generic datasheet for many of our crystals. The value of the crystal may not match. 20ppm * 12pF load capacitance Features: Small 5x3.2mm footprint Operating temperature: -40-85C Frequency Tolerance: +/- Documents: AT-SMD-5x3.pdf ...