Filter
Top Products
Intel
®
IXP43X Product Line of Network Processors—Hardware Design Guidelines
Intel
®
IXP43X Product Line of Network Processors
HDG April 2007
52 Document Number: 316844; Revision: 001US
3.13.3 Recommendations for Crystal Selection
The parameters that should be considered while selecting the crystal to be used are:
Note: 1) The capacitance value here does not include stray capacitance. The design has been
simulated to work with load capacitance up to 36pF.
2) This does not include the stray resistance. The design has been simulated to work up
to 40 ohm series resistance.
The Rf and Rs may not needed. Please refer to the crystal vendor datasheet for
recommendation.
Figure 14. Clock Oscillator Interface Example
3.3 V
OSC_IN
OSC_OUT
OUT
ON
VDD
0.01 µF
33.33 MHz
B4111-005
Intel® IXP43X
Product Line of
Network
Processors
33 KΩ
10 KΩ
Frequency 33.33 MHz
Operation Mode Fundamental
Load
Capacitance
18 pF (This is the capacitance value of the discrete component) *Note1
Frequency
Tolerance
+/- 30 ppm
Frequency
stability over
temperature
+/- 50 ppm
Effective Series
Resistance (ESR)
20 ohm *Note2
Drive level > 100 uW