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参数资料
| 型号： | SL28548ALC-2T |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, QCC64 |
| 封装： | 9 X 9 MM, 0.50 MM PITCH, ROHS COMPLIANT, QFN-64 |
| 文件页数： | 8/32页 |
| 文件大小： | 685K |
| 代理商： | SL28548ALC-2T |
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SL28548-2
Rev 1.5 July 28, 2008
Page 16 of 32
Byte 18: Control Register 18
The SL28548-2 requires a Parallel Resonance Crystal. Substi-
tuting a series resonance crystal causes the SL28548-2 to
operate at the wrong frequency and violates 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, use the total capac-
itance the crystal sees to calculate the appropriate capacitive
loading (CL).
Figure 1 shows a typical crystal configuration using the two
trim capacitors. It is important that the trim capacitors are in
series with the crystal. It is not true that load capacitors are in
parallel with the crystal and are approximately equal to the
load capacitance of the crystal.
Calculating Load Capacitors
In addition to the standard external trim capacitors, consider
the trace capacitance and pin capacitance to calculate the
crystal loading correctly. Again, the capacitance on each side
7
0
SMSW_EN
Enable Smooth Switching
0 = Disabled, 1= Enabled
6
0
SMSW_SEL
Smooth switch select
0 = CPU_PLL, 1 = SRC_PLL
5
0
SE1/SE2 _DSC0
SE1 and SE2 drive strength Setting 2 of 3(see Byte 18 for more setting)
0 = Low, 1= High
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
REF_DSC0
REFdrive strength strength Setting 2 of 3(see Byte 18 for more setting)
0 = Low, 1= High
1
0
USB_DSC0
USB drive strength strength Setting 2 of 3(see Byte 18 for more setting)
0 = Low, 1= High
0
PCI/ PCIF_DSC0
PCI drive strength strength Setting 2 of 3(see Byte 18 for more setting)
0 = Low, 1= High
Byte 17: Control Register 17 (continued)
7
0
REF_DSC2
Drive Strength Control (DSC: 2:0)
6
0
RESERVED
5
0
RESERVED
4
0
RESERVED
3
0
USB_DSC2
2
0
PCI/PCIF_DSC2
1
0
SE1/SE2_DSC2
0
RESERVED
DSC_2
(Byte18)
DSC_1
(Vario us B ytes )
DSC_0
(Byte 17)
Buf f er
Strength
1
Strongest
1
0
1
0
1
0
1
Def ault
0
1
0
1
0
Weakest
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
Figure 1. Crystal Capacitive Clarification
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SL28610BLC | 功能描述:时钟发生器及支持产品 AtomPoulsbo Handheld Embed.1.5V PCIe G1 RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28610BLCT | 功能描述:时钟发生器及支持产品 AtomPoulsbo Handheld Embed.1.5V PCIe G1 RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28610BLI | 功能描述:时钟发生器及支持产品 AtomPoulsbo Handheld Embed.1.5V PCIe G1 RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28610BLIT | 功能描述:时钟发生器及支持产品 AtomPoulsbo Handheld Embed.1.5V PCIe G1 RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28610BLITR | 制造商:Silicon Laboratories Inc 功能描述: |
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