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参数资料
| 型号： | MK1493-03BGLF |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 100 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | 6.10 MM, 0.50 MM PITCH, ROHS COMPLIANT, TSSOP-48 |
| 文件页数： | 3/19页 |
| 文件大小： | 440K |
| 代理商： | MK1493-03BGLF |
MK1493-03B
PCI CLOCK GENERATOR
CLOCK SYNTHESIZER
IDT PCI CLOCK GENERATOR
11
MK1493-03B
REV H 051310
External Components
The MK1493-03B requires a minimum number of external
components for proper operation.
Decoupling Capacitor
Decoupling capacitors of 0.1F and 0.001F must be
connected between each VDD and GND (pins 12&9,
30&29, 40&41, 35&34, 6&5, 17&16, 14&15) as close to the
device as possible. For optimum device performance, the
decoupling capacitor should be mounted on the component
side of the PCB. Avoid the use of vias in the decoupling
circuit.
Series Termination Resistor
When the PCB trace between the clock outputs and the
loads are over 1 inch, series termination should be used. To
series terminate a 50
trace (a commonly used trace
impedance), place a 33
resistor in series with the clock
line, as close to the clock output pin as possible. The
nominal impedance of the clock output is 20
.
Crystal Information
The crystal used should be a fundamental mode (do not use
third overtone), parallel resonant. Crystal capacitors should
be connected from pins X1 to ground and X2 to ground to
optimize the initial accuracy. The value of these capacitors
is given by the following equation:
Crystal caps (pF) = (CL - 6) x 2
In the equation, CL is the crystal load capacitance. So, for a
crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2]
capacitors should be used.
Shared Pin Operation- Input/Output
Pins
The I/O pins designated by (input/output) serve as dual
signal functions to the device. During initial power-up, they
act as input pins. The logic level(voltage) that is present on
these pins at this time is read and stored into a 5-bit internal
data latch. At the end of Power-On reset, (see AC
characteristics for timing values), the device changes the
mode of operations for these pins to an output function. In
this mode the pins produce the specified buffered clocks to
external loads.
Figure 1
To program (load) the internal configuration register for
these pins, a resistor is connected to either the VDD (logic
1) power supply or the GND (logic 0) voltage potential. A
10Kilo ohm (10 K) resistor is used to provide both the solid
CMOS programming voltage needed during the power-up
programming period and to provide an insignificant load on
the output clock during the subsequent operating period.
Figure 1 above shows a means of implementing this
function when a switch or 2-pin header is used. With no
jumpers installed the pin will be pulled high. With the jumper
in place the pin will be pulled low. If programmability is not
necessary, than only a single resistor is necessary. The
programming resistors should be located close to the series
termination resistor to minimize the current loop area. It is
more important to locate the series termination resistor
close to the driver than the programming resistor
Via to
VDD
Clock trace to load
Series Term. R es.
Programming
Header
Via to G nd
Device
Pad
2K
8.2K
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MK1493-03BGLFTR | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:PCI CLOCK GENERATOR |
| MK1493-05G | 功能描述:IC CLK DVR SPRD SPECTRUM 16TSSOP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 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 |
| MK1493-05GILF | 功能描述:时钟驱动器及分配 DIFFERENTIAL SPREAD SPECTRUM CLK DRIVER RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MK1493-05GILFTR | 功能描述:时钟驱动器及分配 DIFFERENTIAL SPREAD SPECTRUM CLK DRIVER RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MK1493-05GLF | 功能描述:时钟驱动器及分配 DIFFERENTIAL SPREAD SPECTRUM CLK DRIVER RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
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