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CY2254ASC-2 PDF预览

CY2254ASC-2

更新时间: 2024-11-16 22:50:39
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 晶体驱动器时钟发生器微控制器和处理器外围集成电路光电二极管
页数 文件大小 规格书
8页 97K
描述
Pentium Processor Compatible Clock Synthesizer/Driver

CY2254ASC-2 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:SOIC包装说明:0.300 INCH, SOIC-28
针数:28Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.74Is Samacsys:N
其他特性:ALSO OPERATES AT 5V SUPPLYJESD-30 代码:R-PDSO-G28
JESD-609代码:e0长度:17.9 mm
湿度敏感等级:1端子数量:28
最高工作温度:70 °C最低工作温度:
最大输出时钟频率:66.66 MHz封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装等效代码:SOP28,.4
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
峰值回流温度(摄氏度):225电源:3.3/5 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:2.65 mm子类别:Clock Generators
最大压摆率:150 mA最大供电电压:3.6 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:MOS
温度等级:COMMERCIAL端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL处于峰值回流温度下的最长时间:30
宽度:7.5 mmuPs/uCs/外围集成电路类型:CLOCK GENERATOR, PROCESSOR SPECIFIC
Base Number Matches:1

CY2254ASC-2 数据手册

 浏览型号CY2254ASC-2的Datasheet PDF文件第2页浏览型号CY2254ASC-2的Datasheet PDF文件第3页浏览型号CY2254ASC-2的Datasheet PDF文件第4页浏览型号CY2254ASC-2的Datasheet PDF文件第5页浏览型号CY2254ASC-2的Datasheet PDF文件第6页浏览型号CY2254ASC-2的Datasheet PDF文件第7页 
4A  
CY2254A  
Pentium® Processor Compatible  
Clock Synthesizer/Driver  
Freq. stability = 0.01% (max.)  
Features  
Output duty cycle 45% min. to 55% max.  
Test mode support (1 option only)  
3.3V or 5.0V operation  
• Multiple clock outputs to meet requirements of most  
Pentium® motherboards  
Four pin-selectable CPU clocks @ 66.66 MHz, 60.0  
MHz, and50.0MHz forsupport ofIntel TritonPCIset  
based PC  
Internal pull-up resistors on S0, S1, and OE inputs  
Functional Description  
55.0 MHz pin-selectable CPU clock also available (2  
The CY2254A is a Clock Synthesizer/Driver that provides the  
multiple clocks required for a Pentium-based PC. The  
CY2254A has low-skew outputs (< 250 ps between the CPU  
Clocks, < 250 ps between the PCI Clocks). In addition, the  
CY2254A CPU clock outputs have less than 200 ps cy-  
cle-to-cycle jitter. Finally, both the PCI and CPU clock outputs  
meet the 1 V/ns slew rate requirement of a Pentium proces-  
sor-based system.  
option only)  
Six PCI clocks at 1/2 CPU Clock frequency  
One I/O clock @ 24 MHz  
OneKeyboardControllerclock@ 12MHz(1 option)  
or one Universal Serial Bus clock @ 48 MHz  
(2 option)  
Two Ref. clocks @ 14.318 MHz  
The CY2254A accepts a 14.318 MHz reference signal as its  
input. The CY2254A has 2 PLLs, one of which generates the  
CPU and PCI clocks, and the other generates the I/O and Key-  
board Controller or USB clocks. The CY2254A runs off either  
a 3.3V or 5V supply.  
Ref. 14.318 MHz Xtal oscillator input  
CPU clock jitter < 200 ps cycle-to-cycle  
Low skew outputs  
< 250 ps between CPU clocks  
The CY2254A is available in two options. The 1 option sup-  
ports the Intel Triton PCIset and provides a 12 MHz keyboard  
clock on pin 25. The 2 option provides a 48 MHz USB clock  
on pin 25 and supports the Cyrix® M1 processor.  
< 250 ps between PCI clocks  
< 500 ps between CPU and PCI clocks (2 option)  
CPU clock leads PCI clock by +1 ns min. to +4 ns  
max. (1 option)  
Pin Configuration  
Logic Block Diagram  
REF0 (14.318 MHz)  
Top View  
REF1 (14.318 MHz)  
KBDCLK (12 MHz)  
SOIC  
SYS  
÷2  
÷2  
PLL  
V
REF0  
REF1  
1
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
DD  
14.318  
MHz  
OSC.  
XTALIN  
XTALIN  
IOCLK (24 MHz)  
2
XTALOUT  
V
DD  
3
XTALOUT  
USBCLK (48 MHz)  
V
SS  
SEEBELOW  
IOCLK  
4
OE  
CPUCLK0  
CPUCLK1  
5
CPU  
PLL  
V
SS  
6
CPUCLK0  
CPUCLK1  
CPUCLK2  
CPUCLK3  
PCICLK2  
PCICLK3  
7
V
DD  
8
ROM  
CPUCLK2  
CPUCLK3  
V
DD  
9
PCICLK4  
PCICLK5  
10  
11  
12  
V
SS  
S0  
S1  
÷2  
DELAY  
S1  
S0  
V
SS  
PCICLK1  
PCICLK0  
13  
14  
16  
15  
V
DD  
1 option only  
PCICLK0  
PCICLK1  
PCICLK2  
PCICLK3  
PIN 25  
OPTION  
KBDCLK  
12 MHz  
USBCLK  
48 MHz  
1  
2  
PCICLK4  
PCICLK5  
OE  
Intel and Pentium are registered trademarks of Intel Corporation.  
Triton is a trademark of Intel Corporation.  
Cyrix is a registered trademark of Cyrix Corporation.  
Cypress Semiconductor Corporation  
Document #: 38-07203 Rev. *A  
3901 North First Street  
San Jose  
CA 95134  
408-943-2600  
Revised December 14, 2002  

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