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| 型号： | IDT74FCT388915TEJG8 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | FCT SERIES, PLL BASED CLOCK DRIVER, 7 TRUE OUTPUT(S), 1 INVERTED OUTPUT(S), PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 9/10页 |
| 文件大小： | 119K |
| 代理商： | IDT74FCT388915TEJG8 |
COMMERCIALTEMPERATURERANGE
8
IDT74FCT388915T
3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE)
CMMU
CM MU
CPU
CM MU
CMMU
CM MU
CMMU
CM MU
CPU
CM MU
CMMU
CM MU
PLL
2f
PLL
2f
CPU
CARD
CPU
CARD
CLOCK
@f
SYSTEM
CLO CK
SO UR CE
FCT388915T
DISTRIBUTE
CLO CK @ f
CLOCK @ 2f
at point of use
MEMORY
CO NTROL
PLL
2f
MEMORY
CAR DS
CLOCK @ 2f
at point of use
FCT388915T
Figure 4. Multiprocessing Application Using the FCT388915T for Frequency Multiplication
and Low Board-to-Board skew
FCT388915T SYSTEM LEVEL TESTING
FUNCTIONALITY
When the PLL_EN pin is LOW, the PLL is bypassed and the FCT388915T
is in low frequency "test mode". In test mode (with FREQ_SEL HIGH), the 2Q
output is inverted from the selected SYNC input, and the Q outputs are divide-
by-2 (negative edge triggered) of the SYNC input, and the Q/2 output is divide-
by-4(negativeedgetriggered). WithFREQ_SELLOWthe2Qoutputisdivide-
by-2 of the SYNC, the Q outputs divide-by-4, and the Q/2 output divide-by-8.
These relationships can be seen in the block diagram. A recommended test
configuration would be to use SYNC0 or SYNC1 as the test clock input, and tie
PLL_EN and REF_SEL together and connect them to the test select logic.
This functionality is needed since most board-level testers run at 1 MHz or
below, and theFCT 388915T cannot lock onto that low of an input frequency.
In the test mode described above, any test frequency test can be used.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT74FCT399P | 制造商:Integrated Device Technology Inc 功能描述: |
| IDT74FCT521AP | 制造商:Integrated Device Technology Inc 功能描述: |
| IDT74FCT521ASO | 制造商:Integrated Device Technology Inc 功能描述:IDENTITY COMPARATOR, 20 Pin, Plastic, SOP |
| IDT74FCT521ATPYG | 功能描述:IC COMPARATOR IDENTITY 8B 20SSOP RoHS:是 类别:集成电路 (IC) >> 逻辑 - 比较器 系列:74FCT 标准包装:1 系列:4000B 类型:幅值比较器 位数:4 输出:高有效 输出功能:A<B，A=B，A>B 电源电压:3 V ~ 18 V 输出电流高，低:4.2mA，4.2mA 额定电压和最大 CL 时的最大传播延迟:350ns @ 15V，50pF 电流 - 静态:100µA 工作温度:-55°C ~ 125°C 封装/外壳:16-SOIC（0.209"，5.30mm 宽） 安装类型:表面贴装 包装:剪切带 (CT) 其它名称:296-14121-1 |
| IDT74FCT521ATPYG8 | 功能描述:IC COMPARATOR IDENTITY 8B 20SSOP RoHS:是 类别:集成电路 (IC) >> 逻辑 - 比较器 系列:74FCT 标准包装:1 系列:4000B 类型:幅值比较器 位数:4 输出:高有效 输出功能:A<B，A=B，A>B 电源电压:3 V ~ 18 V 输出电流高，低:4.2mA，4.2mA 额定电压和最大 CL 时的最大传播延迟:350ns @ 15V，50pF 电流 - 静态:100µA 工作温度:-55°C ~ 125°C 封装/外壳:16-SOIC（0.209"，5.30mm 宽） 安装类型:表面贴装 包装:剪切带 (CT) 其它名称:296-14121-1 |
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