參數(shù)資料
型號(hào)： CY28405-3
英文描述： Clocks and Buffers
中文描述： 時(shí)鐘和緩沖器
文件頁(yè)數(shù)： 23/48頁(yè)
文件大?。?/td> 538K
代理商： CY28405-3
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
相關(guān)PDF資料
PDF描述
CY28412 Clocks and Buffers
CY28419 Clocks and Buffers
CY28510 Clocks and Buffers
CY2901CDC Microprocessor Slice
CY2901CDMB Microprocessor Slice
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CY28405OC 制造商:Cypress Semiconductor 功能描述:
CY28405OC-2 制造商:SPECTRALINEAR 制造商全稱(chēng):SPECTRALINEAR 功能描述:Clock Synthesizer with Differential SRC and CPU Outputs
CY28405OC-2T 制造商:Rochester Electronics LLC 功能描述:FTG FOR INTEL 865 AND 875 CHIPSETS (CK409) - Bulk
CY28405OC-3 制造商:Rochester Electronics LLC 功能描述:CLOCK SYNTHESIZER WITH DIFFERENTIAL SRC & CPU OUT - Bulk
CY28405OC-3T 制造商:Rochester Electronics LLC 功能描述:CLOCK SYNTHESIZER WITH DIFFERENTIAL SRC & CPU OUT - Bulk
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*