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| 型號(hào)： | CY28412 |
| 英文描述： | Clocks and Buffers |
| 中文描述： | 時(shí)鐘和緩沖器 |
| 文件頁(yè)數(shù)： | 39/48頁(yè) |
| 文件大小： | 538K |
| 代理商： | CY28412 |
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CY28405-2
Document #: 38-07511 Rev. *C
Page 7 of 16
Crystal Recommendations
The CY28405-2 requires a
Parallel Resonance Crystal
.
Substituting a series resonance crystal will cause the
CY28405-2 to operate at the wrong frequency and violate the
ppm specification. 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
.
2
0
PCIF
PCI
3V66
SRCT,SRCC
CPUT_ITP,CPUC_ITP
REF_1
Spread Spectrum Enable
0 = Spread Off, 1 = Spread On
1
1
REF_1 Output Enable
0 = Disabled, 1 = Enabled
REF_0 Output Enable
0 = Disabled, 1 = Enabled
0
1
REF_0
Byte 7: Control Register
Bit
7
6
5
4
3
2
1
0
@Pup
0
1
0
0
1
0
0
0
Name
Description
Revision ID Bit 3
Revision ID Bit 2
Revision ID Bit 1
Revision ID Bit 0
Vendor ID Bit 3
Vendor ID Bit 2
Vendor ID Bit 1
Vendor ID Bit 0
Revision ID Bit 3
Revision ID Bit 2
Revision ID Bit 1
Revision ID Bit 0
Vendor ID Bit 3
Vendor ID Bit 2
Vendor ID Bit 1
Vendor ID Bit 0
Byte 6: Control Register
(continued)
Bit
@Pup
Name
Description
Table 6. Crystal Recommendations
Frequency
(Fund)
14.31818 MHz
Cut
Loading
Load Cap
Drive
(max.)
0.1 mW
Shunt Cap
(max.)
5 pF
Motional
(max.)
0.016 pF
Tolerance
(max.)
50 ppm
Stability
(max.)
50 ppm
Aging
(max.)
5 ppm
AT
Parallel
20 pF
Figure 1. Crystal Capacitive Clarification
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