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CY2278APAC-4L

更新时间： 2024-09-30 14:33:11
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 时钟光电二极管外围集成电路晶体
页数 文件大小 规格书
12页 161K
描述
Processor Specific Clock Generator, 75MHz, CMOS, PDSO48, 6 X 12 MM, TSSOP-48

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中文翻译

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CY2278APAC-4L 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：6 X 12 MM, TSSOP-48
针数：48Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.84Is Samacsys：N
JESD-30 代码：R-PDSO-G48JESD-609代码：e0
长度：12.5 mm端子数量：48
最高工作温度：70 °C最低工作温度：
最大输出时钟频率：75 MHz封装主体材料：PLASTIC/EPOXY
封装代码：TSSOP封装等效代码：TSSOP48,.3,20
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：NOT SPECIFIED电源：2.5,3.3 V
主时钟/晶体标称频率：14.318 MHz认证状态：Not Qualified
座面最大高度：1.2 mm子类别：Clock Generators
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 (Sn/Pb)端子形式：GULL WING
端子节距：0.5 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：6.1 mm
uPs/uCs/外围集成电路类型：CLOCK GENERATOR, PROCESSOR SPECIFICBase Number Matches：1

CY2278APAC-4L 数据手册

 浏览型号CY2278APAC-4L的Datasheet PDF文件第2页浏览型号CY2278APAC-4L的Datasheet PDF文件第3页浏览型号CY2278APAC-4L的Datasheet PDF文件第4页浏览型号CY2278APAC-4L的Datasheet PDF文件第5页浏览型号CY2278APAC-4L的Datasheet PDF文件第6页浏览型号CY2278APAC-4L的Datasheet PDF文件第7页 
8A  
CY2278A  
Pentium /II Clock Synthesizer/Driver for Mobile PCs  
with Intel 82430TX and No SDRAM  
voltage applied on pin 42. There are ten PCI clocks, running  
at one half the CPU clock frequency. Free-running PCI and  
Features  
• Mixed 2.5V and 3.3V operation  
CPU clocks are available as options shown in the selector  
guide. Additionally, the part outputs two 3.3V USB/IR clocks at  
48 MHz, one Keyboard clock at 8 MHz, one 2.5V IOAPIC clock  
at 14.318 MHz, and two 3.3V reference clocks at 14.318 MHz.  
• Complete clock solution to meet requirements of mo-  
bile Pentium® and Pentium® II motherboards  
— Seven CPU clock outputs (three at 3.3V, and four at  
2.5Vor3.3V)witheightselectableclockfrequencies.  
The CY2278 family contains several features for output flexi-  
bility and power control. The CPU, PCI, USB and IR clock  
frequencies are all factory EPROM-programmable. Three  
hardware select inputs support eight CPU clock frequencies  
from 20–75 MHz. Additionally, each of the CPU, PCI, and  
USB/IR clock sets can be turned on or off with a dedicated  
enable input pin for power management.  
— Ten 3.3V synchronous PCI clock outputs  
— Two 3.3V USB/IR clocks at 48 MHz  
— One Keyboard clock at 8 MHz  
— One 2.5V IOAPIC clock at 14.318 MHz  
— Two 3.3V Ref. clocks at 14.318 MHz  
• Dedicated power management for portable systems  
The CY2278A outputs are designed for low EMI emissions.  
Controlled rise and fall times, unique output driver circuits and  
factory-EPROM programmable output drive and slew-rate en-  
able optimal configurations for EMI control.  
— Separate output enable pins for CPU, PCI, and  
USB/IR clock sets  
— Free-running PCI and CPU clocks (see options)  
CY2278A Selector Guide  
• Factory-EPROM programmable output drive and slew  
Clock Outputs  
CPU@3.3V  
-1L  
-2L  
3
-3L  
3
-4L  
3
rate for EMI customization  
3
• Custom configuration with factory-EPROM program-  
mable CPU, PCI, and USB/IR frequencies.  
• Low skew and low jitter outputs  
• Available in space-saving 48-pin TSSOP package  
CPU@2.5/3.3V  
PCI (CPU/2 MHz)  
USB/IR (48 MHz)  
KB (8 MHz)  
4[1]  
10[2]  
2
4
4
10[2]  
4
10[2]  
10  
2
2
2
Functional Description  
1
1
1
1
IOAPIC (14.318 MHz)  
Ref (14.318 MHz)  
CPU-PCI delay  
2
2
2
2
The CY2278A is a Clock Synthesizer/Driver chip for Pentium  
or Pentium II portable PCs designed with the 82430TX or sim-  
ilar core-logic chipsets. There are four options available as  
shown in the selector guide.  
2
2
2
2
0 ns  
0 ns 1–5 ns 0 ns  
Notes:  
The CY2278A outputs seven CPU clocks, three of which run  
at 3.3V and four run at either 2.5V or 3.3V, depending on the  
1. One free-running CPU clock.  
2. Two free-running PCI clocks.  
2.5–3.3V Driver  
Logic Block Diagram  
IOAPIC  
14.318 MHz  
REF[0-1]  
X
IN  
96 MHz  
PLL0  
OSC.  
X
48 MHz  
OUT  
/2  
USBCLK/IRCLK  
CLK8MHz  
D
D
USB_RUN  
CK  
CK  
8 MHZ  
/12  
2.5–3.3V Driver  
CPUCLK  
SEL2  
SEL1  
SEL0  
PLL1  
XCPUCLK [0-2]  
EPROM  
XCPUCLK3_F  
on -1L only; not free-  
running on -2L, -3L, -4L  
CPUCLK [0-2]  
D
D
CPU_RUN  
CK  
CK  
PCICLK  
/2  
PCICLK [2-9]  
PCICLK_F [0-1]  
on -1L, -3L, -4L only; not free-  
D
D
PCI_RUN  
running on -2L  
CK  
CK  
Intel and Pentium are registered trademarks of Intel Corporation.  
Cypress Semiconductor Corporation  
Document #: 38-07211 Rev. *A  
•
3901 North First Street  
•
San Jose  
•
CA 95134  
•
408-943-2600  
Revised Decemeber 07, 2002  
1234567...12

中文翻译

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