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參數(shù)資料
| 型號： | CY505YC64DTT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLK CK505 BROADWATER 64TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | 時鐘/頻率發(fā)生器 |
| PLL： | 是 |
| 主要目的： | Intel CPU 服務(wù)器 |
| 輸入： | 晶體 |
| 輸出： | HCSL，LVCMOS |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:24 |
| 差分 - 輸入:輸出： | 無/是 |
| 頻率 - 最大： | 400.9MHz |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-TFSOP （0.240"，6.10mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 64-TSSOP |
| 包裝： | 帶卷 (TR) |
CY505YC64D
.................... Document #: 001-03543 Rev *E Page 11 of 24
The CY505YC64DT requires a parallel resonance crystal.
Substituting
a
series
resonance
crystal
causes
the
CY505YC64DT 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 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.
Byte 16 Control Register 16
Bit
@Pup
Name
Description
7
0
PCI-E_N7
PCI-E Dial-A-Frequency Bit N7
6
0
PCI-E_N6
PCI-E Dial-A-Frequency Bit N6
5
0
PCI-E_N5
PCI-E Dial-A-Frequency Bit N5
4
0
PCI-E_N4
PCI-E Dial-A-Frequency Bit N4
3
0
PCI-E_N3
PCI-E Dial-A-Frequency Bit N3
2
0
PCI-E_N2
PCI-E Dial-A-Frequency Bit N2
1
0
PCI-E_N1
PCI-E Dial-A-Frequency Bit N1
0
PCI-E_N0
PCI-E Dial-A-Frequency Bit N0
Byte 17 Control Register 17
Bit
@Pup
Name
Description
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
RESERVED
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
FS_D
CPU Frequency Select Bit, reflect value of FSD in latches open state
1
0
RESERVED
0
RESERVED
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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