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CY28411 Datasheet(PDF) 7 Page - Silicon Laboratories

Part # CY28411
Description  Clock Generator for Intel짰Alviso Chipset
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

CY28411 Datasheet(HTML) 7 Page - Silicon Laboratories

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CY28411
........................ Document #: 38-07594 Rev. *B Page 7 of 18
Crystal Recommendations
The CY28411 requires a Parallel Resonance Crystal. Substi-
tuting a series resonance crystal will cause the CY28411 to
operate at the wrong frequency and violate the ppm specifi-
cation. For most applications there is a 300-ppm frequency
shift between series and parallel crystals due to incorrect
loading.
Crystal Loading
Crystal loading plays a critical role in achieving low ppm perfor-
mance. To realize low ppm performance, the total capacitance
the crystal will see must be considered to calculate the appro-
priate capacitive loading (CL).
The following diagram shows a typical crystal configuration
using the two trim capacitors. An important clarification for the
following discussion is that the trim capacitors are in series
with the crystal not parallel. It’s a common misconception that
load capacitors are in parallel with the crystal and should be
approximately equal to the load capacitance of the crystal.
This is not true.
Byte 6: Control Register 6
Bit
@Pup
Name
Description
7
0
REF/N or Hi-Z Select
0 = Hi-Z, 1 = REF/N Clock
6
0
Test Clock Mode Entry Control
0 = Normal operation, 1 = REF/N or Hi-Z mode,
5
0
Reserved
Reserved, Set = 0
4
1
REF
REF Output Drive Strength
0 = Low, 1 = High
3
1
PCIF, SRC, PCI
SW PCI_STP Function
0=SW PCI_STP assert, 1= SW PCI_STP deassert
When this bit is set to 0, all STOPPABLE PCI, PCIF and SRC outputs will
be stopped in a synchronous manner with no short pulses.
When this bit is set to 1, all STOPPED PCI, PCIF and SRC outputs will
resume in a synchronous manner with no short pulses.
2
Externally
selected
CPUT/C
FS_C Reflects the value of the FS_C pin sampled on power up
0 = FS_C was low during VTT_PWRGD# assertion
1
Externally
selected
CPUT/C
FS_B Reflects the value of the FS_B pin sampled on power up
0 = FS_B was low during VTT_PWRGD# assertion
0
Externally
selected
CPUT/C
FS_A Reflects the value of the FS_A pin sampled on power up
0 = FS_A was low during VTT_PWRGD# assertion
Byte 7: Vendor ID
Bit
@Pup
Name
Description
7
0
Revision Code Bit 3
Revision Code Bit 3
6
0
Revision Code Bit 2
Revision Code Bit 2
5
0
Revision Code Bit 1
Revision Code Bit 1
4
1
Revision Code Bit 0
Revision Code Bit 0
3
1
Vendor ID Bit 3
Vendor ID Bit 3
2
0
Vendor ID Bit 2
Vendor ID Bit 2
1
0
Vendor ID Bit 1
Vendor ID Bit 1
0
0
Vendor ID Bit 0
Vendor ID Bit 0
Table 5. Crystal Recommendations
Frequency
(Fund)
Cut
Loading
Load Cap
Drive
(max.)
Shunt Cap
(max.)
Motional
(max.)
Tolerance
(max.)
Stability
(max.)
Aging
(max.)
14.31818 MHz
AT
Parallel
20 pF
0.1 mW
5 pF
0.016 pF
35 ppm
30 ppm
5 ppm


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