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| 型号： | ICS557GI-05ALF |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC CLK SOURCE QUAD PCI 20-TSSOP |
| 产品培训模块： | PCI-Express |
| 特色产品： | PCI-Express Clock Source |
| 标准包装： | 74 |
| 系列： | PCI Express® (PCIe) |
| 类型： | 扩展频谱时钟发生器，扇出缓冲器（分配） |
| PLL： | 是 |
| 主要目的： | PCI Express（PCIe） |
| 输入： | 时钟，晶体 |
| 输出： | HCSL，LVDS |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:4 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 200MHz |
| 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： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1252 (CN2011-ZH PDF) |
| 其它名称： | 557GI-05ALF 800-1067 800-1067-5 800-1067-ND |
ICS557-05A
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
PCIE SSCG
IDT
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
4
ICS557-05A
REV O 112111
Application Information
Decoupling Capacitors
As with any high-performance mixed-signal IC, the
ICS557-05A must be isolated from system power supply
noise to perform optimally.
Decoupling capacitors of 0.01F must be connected
between each VDD and the PCB ground plane.
PCB Layout Recommendations
For optimum device performance and lowest output phase
noise, the following guidelines should be observed.
Each 0.01F decoupling capacitor should be mounted on
the component side of the board as close to the VDD pin as
possible. No vias should be used between decoupling
capacitor and VDD pin. The PCB trace to VDD pin should
be kept as short as possible, as should the PCB trace to the
ground via. Distance of the ferrite bead and bulk decoupling
from the device is less critical.
2) An optimum layout is one with all components on the
same side of the board, minimizing vias through other signal
layers (the ferrite bead and bulk decoupling capacitor can be
mounted on the back). Other signal traces should be routed
away from the ICS557-05A.
This includes signal traces just underneath the device, or on
layers adjacent to the ground plane layer used by the device.
External Components
A minimum number of external components are required for
proper operation. Decoupling capacitors of 0.01
μF should
be connected between VDD and GND pairs (1,9 and 15,16)
as close to the device as possible.
On chip capacitors- Crystal capacitors should be
connected from pins X1 to ground and X2 to ground to
optimize the initial accuracy. The value (in pf) of these
crystal caps equal (CL-12)*2 in this equation, CL=crystal
load capacitance in pf. For example, for a crystal with a 16
pF load cap, each external crystal cap would be 8 pF.
[(16-12)x2]=8.
Current Reference Source Rr (Iref)
If board target trace impedance (Z) is 50
Ω, then Rr = 475Ω
(1%), providing IREF of 2.32 mA, output current (IOH) is
equal to 6*IREF.
Load Resistors RL
Since the clock outputs are open source outputs, 50 ohm
external resistors to ground are to be connected at each
clock output.
Output Termination
The PCI-Express differential clock outputs of the
ICS557-05A are open source drivers and require an
external series resistor and a resistor to ground. These
resistor values and their allowable locations are shown in
detail in the PCI-Express Layout Guidelines section.
The ICS557-05A can also be configured for LVDS
compatible voltage levels. See the LVDS Compatible
Layout Guidelines section.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS557GI-05ALFT | 功能描述:IC CLK SOURCE QUAD DIFF 20TSSOP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:PCI Express® (PCIe) 标准包装:28 系列:- 类型:时钟/频率发生器 PLL:是 主要目的:Intel CPU 服务器 输入:时钟 输出:LVCMOS 电路数:1 比率 - 输入:输出:3:22 差分 - 输入:输出:无/是 频率 - 最大:400MHz 电源电压:3.135 V ~ 3.465 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:64-TFSOP （0.240"，6.10mm 宽） 供应商设备封装:64-TSSOP 包装:管件 |
| ICS557GI-05ALFTR | 制造商:ICS 制造商全称:ICS 功能描述:Quad Differential PCI-Express Clock Source |
| ICS557GI-05AT | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE |
| ICS557GI-05ATR | 制造商:ICS 制造商全称:ICS 功能描述:Quad Differential PCI-Express Clock Source |
| ICS557GI-06 | 功能描述:IC CLK BUFFER 1:4 HCSL 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:PCI Express® (PCIe) 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
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