291G-XXT

更新时间： 2024-02-11 07:42:53

品牌	Logo	应用领域
艾迪悌 - IDT		时钟
页数	文件大小	规格书
10页	218K
描述
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER

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291G-XXT 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	TSSOP	包装说明：	0.173 INCH, TSSOP-20
针数：	20	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.06	JESD-30 代码：	R-PDSO-G20
JESD-609代码：	e0	长度：	6.5 mm
湿度敏感等级：	1	端子数量：	20
最高工作温度：	70 °C	最低工作温度：
最大输出时钟频率：	200 MHz	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	240
主时钟/晶体标称频率：	166 MHz	认证状态：	Not Qualified
座面最大高度：	1.2 mm	最大供电电压：	3.465 V
最小供电电压：	3.135 V	标称供电电压：	3.3 V
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	4.4 mm	uPs/uCs/外围集成电路类型：	CLOCK GENERATOR, OTHER
Base Number Matches：	1

291G-XXT 数据手册

ICS291

TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER

EPROM CLOCK SYNTHESIZER

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.

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.

The ICS291 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%.

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS291. These ratings, which are

standard values for ICS 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

Inputs

Referenced to GND

-0.5

-65

VDD+0.5

150

Clock Outputs

Storage Temperature

Soldering Temperature

Junction Temperature

°C

Max 10 seconds

260

125

Recommended Operation Conditions

Parameter

Min.

Typ.

Max.

+70

Units

° C

Ambient Operating Temperature (ICS291GP)

Ambient Operating Temperature (ICS291GIP)

Power Supply Voltage (measured in respect to GND)

Power Supply Ramp Time

-40

+85

° C

+3.135

+3.3

+3.465

IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 4

ICS291

REV D 061306

1 2 345 6 7...10

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