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参数资料
| 型号： | ICS841654AGILFT |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 2/17页 |
| 文件大小： | 0K |
| 描述： | IC CLOCK GENERATOR 28-TSSOP |
| 标准包装： | 1,000 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 类型： | 时钟发生器，扇出配送，多路复用器 |
| PLL： | 带旁路 |
| 输入： | LVCMOS，LVTTL，晶体 |
| 输出： | HCSL，LVCMOS，LVTTL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:5 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 125MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.240"，6.10mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | 841654AGILFT |
IDT / ICS HCSL CLOCK GENERATOR
10
ICS841654AGI REV. A APRIL 17, 2008
ICS841654I
FEMTOCLOCKS CRYSTAL-TO-HCSL CLOCK GENERATOR
CRYSTAL INPUT INTERFACE
The ICS841654I has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in
Figure 2 below
FIGURE 2. CRYSTAL INPUt INTERFACE
were determined using a 25MHz, 18pF parallel resonant crystal
and were chosen to minimize the ppm error.
C1
27p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
LVCMOS TO XTAL INTERFACE
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC couple capacitor. A general interface diagram is
shown in
Figure 3. The XTAL_OUT pin can be left floating.
The input edge rate can be as slow as 10ns. For LVCMOS
inputs, it is recommended that the amplitude be reduced from
full swing to half swing in order to prevent signal interference
with the power rail and to reduce noise. This configuration
requires that the output impedance of the driver (Ro) plus the
series resistance (Rs) equals the transmission line impedance.
In addition, matched ter mination at the crystal input will
attenuate the signal in half. This can be done in one of two
ways. First, R1 and R2 in parallel should equal the transmission
line impedance. For most 50
Ω applications, R1 and R2 can be
100
Ω. This can also be accomplished by removing R1 and
making R2 50
Ω.
FIGURE 3. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE
XTAL_IN
XTAL_OUT
VCC
R2
Ro
R1
Zo = 50
Rs
VCC
.1uf
VDD
Zo = Ro + Rs
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS841654AGIT | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCKS? CRYSTAL-TO-HCSL CLOCK GENERATOR |
| ICS841654I | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCKS? CRYSTAL-TO-HCSL CLOCK GENERATOR |
| ICS841664AGILF | 功能描述:IC CLOCK GENERATOR 28-TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™, FemtoClock™ 标准包装:1,000 系列:Precision Edge® 类型:时钟/频率合成器 PLL:无 输入:CML，PECL 输出:CML 电路数:1 比率 - 输入:输出:2:1 差分 - 输入:输出:是/是 频率 - 最大:10.7GHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VFQFN 裸露焊盘，16-MLF? 供应商设备封装:16-MLF?（3x3） 包装:带卷 (TR) 其它名称:SY58052UMGTRSY58052UMGTR-ND |
| ICS841664AGILFT | 功能描述:IC CLOCK GENERATOR 28-TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™, FemtoClock™ 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| ICS841664I | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCK? CRYSTAL-TO-HCSL CLOCK GENERATOR |
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