co661al-l Connect One Ltd., co661al-l Datasheet - Page 33

• Manufacturer Part Number: co661al-l
• Description: The Co661al-l Ichip Lan? Internet Controller? Is Part Of A Family Of Intelligent Peripheral Devices That Provides Internet Connectivity Solutions To A Myriad Of Embedded Devices
• Manufacturer: Connect One Ltd.

7.3 Selecting a Crystal
The characteristics of the built-in inverting amplifier set limits on the following
parameters for crystals:
Crystal first overtone frequency .................. 18.432 MHz
ESR (Equivalent Series Resistance) ............ 40 Ω max
Drive Level ............................................….. 1 mW max
Frequency tolerance ……………………………… +/- 100ppm
Load capacitance………………………………….. 18pF
Shunt capacitance…………………………………. 7pF Maximum
The recommended range of values for C 1 and C 2 are as follows:
C 1 ............................................................... 15 pF ± 20%
C 2 ............................................................... 22 pF ± 20%
The specific values for C1 and C2 must be determined by the designer and are dependent
on the characteristics of the chosen crystal and board design.
iChip LAN CO661AL-L Datasheet
C1
C2
Figure 7-3 Selecting a Crystal
Crystal
X1
X2
iChip Designs
7-2