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参数资料
| 型号： | ICS345R-XXT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 200 MHz, OTHER CLOCK GENERATOR, PDSO20 |
| 封装： | 0.150 INCH, SSOP-20 |
| 文件页数： | 4/9页 |
| 文件大小： | 207K |
| 代理商： | ICS345R-XXT |
ICS345
TRIPLE PLL FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER
EPROM CLOCK SYNTHESIZER
IDT / ICS TRIPLE PLL FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER 4
ICS345
REV K 110207
Spread Spectrum Modulation
The ICS345 utilizes frequency modulation (FM) to distribute
energy over a range of frequencies. By modulating the
output clock frequencies, the device effectively lowers
energy across a broader range of frequencies; thus,
lowering a system’s electromagnetic interference (EMI). The
modulation rate is the time from transitioning from a
minimum frequency to a maximum frequency and then back
to the minimum.
Spread Spectrum Modulation can be applied as either
“center spread” or “down spread”. During center spread
modulation, the deviation from the target frequency is equal
in the positive and negative directions. The effective
average frequency is equal to the target frequency. In
applications where the clock is driving a component with a
maximum frequency rating, down spread should be applied.
In this case, the maximum frequency, including modulation,
is the target frequency. The effective average frequency is
less than the target frequency.
The ICS345 operates in both center spread and down
spread modes. For center spread, the frequency can be
modulated between ±0.125% to ±2.0%. For down spread,
the frequency can be modulated between -0.25% to -4.0%.
Both output frequency banks will utilize identical spread
spectrum percentage deviations and modulation rates, if a
common VCO frequency can be identified.
Spread Spectrum Modulation Rate
The spread spectrum modulation frequency applied to the
output clock frequency may occur at a variety of rates. For
applications requiring the driving of “down-circuit” PLLs,
Zero Delay Buffers, or those adhering to PCI standards, the
spread spectrum modulation rate should be set to 30-33
kHz. For other applications, a 120 kHz modulation option is
available.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS345. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Parameter
Condition
Min.
Typ.
Max.
Units
Supply Voltage, VDD
Referenced to GND
7
V
Inputs
Referenced to GND
-0.5
VDD+0.5
V
Clock Outputs
Referenced to GND
-0.5
VDD+0.5
V
Storage Temperature
-65
150
° C
Soldering Temperature
Max 10 seconds
260
° C
Junction Temperature
125
° C
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS348 | 制造商:ICS 制造商全称:ICS 功能描述:Quad PLL Field Programmable VersaClock Synthesizer |
| ICS348-22 | 制造商:ICS 制造商全称:ICS 功能描述:Quad PLL Field Programmable VersaClock Synthesizer |
| ICS348R-22 | 制造商:ICS 制造商全称:ICS 功能描述:Quad PLL Field Programmable VersaClock Synthesizer |
| ICS348R22LF | 制造商:ICS 制造商全称:ICS 功能描述:Quad PLL Field Programmable VersaClock Synthesizer |
| ICS348R-22LF | 制造商:ICS 制造商全称:ICS 功能描述:Quad PLL Field Programmable VersaClock Synthesizer |
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