參數(shù)資料
型號： CY28419
英文描述： Clocks and Buffers
中文描述： 時(shí)鐘和緩沖器
文件頁數(shù)： 39/48頁
文件大?。?/td> 538K
代理商： CY28419
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CY28419OC 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 System Clock w/Diff SRC & CPU Out RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
CY28419OCT 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 System Clock w/Diff SRC & CPU Out RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
CY28419OXC 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 System Clock w/Diff SRC & CPU Out RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
CY28419OXCT 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 System Clock w/Diff SRC & CPU Out RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
CY28419ZC 制造商:Rochester Electronics LLC 功能描述:CLOCK SYNTHESIZER WITH DIFFERENTIAL SRC & CPU OUT - Bulk
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