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參數資料
| 型號： | SL28506BZC-2T |
| 元件分類： | 時鐘產生/分配 |
| 英文描述： | 400 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56 |
| 封裝： | 6 X 12 MM, ROHS COMPLIANT, MO-153, TSSOP2-56 |
| 文件頁數： | 4/28頁 |
| 文件大?。?/td> | 337K |
| 代理商： | SL28506BZC-2T |
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SL28506-2
Rev 1.3 June 18, 2008
Page 12 of 28
Byte 18 Control Register 18
The SL28506-2 requires a parallel resonance crystal. Substi-
tuting a series resonance crystal causes the SL28506-2 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 sees must be considered to calculate the appro-
priate capacitive loading (CL).
Figure 1 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. The common misconception that load
capacitors are in parallel with the crystal and should be
approximately equal to the load capacitance of the crystal is
not true.
Calculating Load Capacitors
In addition to the standard external trim capacitors, trace
capacitance and pin capacitance must also be considered to
correctly calculate crystal loading. As mentioned previously,
the capacitance on each side of the crystal is in series with the
crystal. This means the total capacitance on each side of the
crystal must be twice the specified crystal load capacitance
(CL). While the capacitance on each side of the crystal is in
series with the crystal, trim capacitors (Ce1,Ce2) should be
calculated to provide equal capacitive loading on both sides.
4
0
Prog_PCI-E_EN
Programmable PCI-E frequency enable
0 = Disabled, 1= Enabled
3
0
Prog_CPU_EN
Programmable CPU frequency enable
0 = Disabled, 1= Enabled
2
0
RESERVED
1
0
RESERVED
0
RESERVED
Byte 17 Control Register 17
Bit
@Pup
Name
Description
7
0
PCI_Bit2
Drive Strength Control - DSC[2:0]
6
1
PCI_Bit0
5
0
USB_Bit2
4
0
USB_Bit0
3
0
SE1/SE2_Bit2
2
0
SE1/SE2_Bit0
1
0
REF_Bit2
0
REF_Bit0
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
Bit_2
(Byte18)
Bit_1
(Vario us B ytes)
Bit_0
(Byte 18)
Buf f er
Strength
1
Strongest
1
0
1
0
1
0
Def ault PCI
0
1
Def ault REF/Usb
0
1
0
1
0
Weakest
Figure 1. Crystal Capacitive Clarification
相關PDF資料 |
PDF描述 |
|---|---|
| SL28506BOC-2 | PROC SPECIFIC CLOCK GENERATOR, PDSO56 |
| SL28506BZIT | 400 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO64 |
| SL28548ALC-2T | PROC SPECIFIC CLOCK GENERATOR, QCC64 |
| SL28610BLC | 100 MHz, PROC SPECIFIC CLOCK GENERATOR, QCC48 |
| SL28647CLCT | 400 MHz, PROC SPECIFIC CLOCK GENERATOR, QCC72 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SL28506BZCT | 功能描述:時鐘發(fā)生器及支持產品 CK505 v1.1 PCIe Gen2 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SL28506BZI | 功能描述:時鐘發(fā)生器及支持產品 CK505 v1.1 PCIe Gen2 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SL28506BZI-2 | 功能描述:時鐘發(fā)生器及支持產品 CK505 v1.1 PCIe Gen2 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SL28506BZI-2T | 功能描述:時鐘發(fā)生器及支持產品 CK505 v1.1 PCIe Gen2 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SL28506BZIT | 功能描述:時鐘發(fā)生器及支持產品 CK505 v1.1 PCIe Gen2 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
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