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CY2272PVC-1T

更新时间： 2024-11-18 20:38:35
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 205K
描述
Processor Specific Clock Generator, 75MHz, MOS, PDSO48, SSOP-48

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CY2272PVC-1T 技术参数

生命周期：Obsolete零件包装代码：SSOP
包装说明：SSOP,针数：48
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.84
JESD-30 代码：R-PDSO-G48长度：15.875 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：SSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, SHRINK PITCH
主时钟/晶体标称频率：14.318 MHz认证状态：Not Qualified
座面最大高度：2.794 mm最大压摆率：300 mA
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：MOS温度等级：COMMERCIAL
端子形式：GULL WING端子节距：0.635 mm
端子位置：DUAL宽度：7.5 mm
uPs/uCs/外围集成电路类型：CLOCK GENERATOR, PROCESSOR SPECIFICBase Number Matches：1

CY2272PVC-1T 数据手册

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CY2272  
Pentium®, 6x86, K6 Clock Synthesizer/Driver for Mobile  
PCs with Intel® 82430TX or Ali IV/V+ and 3 SO-DIMMs  
the PCI clocks by 1–4 ns. Additionally, the part outputs six 3.3V  
SDRAM clocks, one 3.3V USB clock at 48 MHz, one IO clock  
Features  
• Mixed 2.5V and 3.3V operation  
at 24 MHz, and two high-drive 3.3V reference clocks at 14.318  
MHz.  
• Complete clock solution for Pentium®, Cyrix, and AMD  
processor-based motherboards  
The part possesses dedicated power-down, CPU stop, and  
PCI stop pins for power management control. When the  
CPU_STOP input is asserted, the CPU clock outputs are driv-  
en LOW. When the PCI_STOP input is asserted, the PCI clock  
outputs (except the free-running PCI clock) are driven LOW.  
When the PWR_DWN pin is asserted, the reference oscillator  
and PLLs are shut down, and all outputs are driven LOW.  
— Four CPU clocks at 2.5V or 3.3V with three dedicated  
CPU frequency select inputs  
— Six 3.3V SDRAM clocks, support three portable  
DIMMs  
— Seven synchronous PCI clocks, one free-running,  
one early  
— One 3.3V 48 MHz USB clock  
The CY2272 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.  
— One 3.3V 24 MHz IO clock  
— Two high drive 3.3V Ref. clocks at 14.318 MHz  
• 1 ns–4 ns delay between CPU and PCI clocks  
2
• I C™ Serial Configuration Interface  
CY2272 Selector Guide  
• Factory-EPROM programmable output drive and slew  
rate for EMI customization  
• Factory-EPROM programmable CPU clock frequencies  
for custom configurations  
• Dedicated Power-down, CPU stop and PCI stop pins  
• Available in space-saving 48-pin SSOP package  
Clock Outputs  
CPU (13.75, 15, 16.6, 18.75, 55, 60, 66.6, 75 MHz)  
SDRAM  
-1  
4
6
[1]  
PCI (CPU/2MHz)  
7
USB (48MHz)  
1
Functional Description  
IO (24MHz)  
1
2
The CY2272 is a clock synthesizer/driver for a Pentium, Cyrix  
6x86, or AMD K6 processor-based mobile PC using Intel®’s  
82430TX, Aladdin IV+ or other similar chipsets.  
Ref (14.318MHz)  
CPU-PCI delay  
1–4 ns  
Note:  
The CY2272-1 outputs four CPU clocks at 2.5V or 3.3V. There  
are seven PCI clocks, running at one half the CPU clock fre-  
quency. One of the PCI clocks is free-running. Another leads  
1. One free-running PCI clock, one early PCI clock.  
a
Pin Configuration  
SSOP  
Logic Block Diagram  
Top View  
REF [0-1] (14.318 MHz)  
AV  
V
DD  
1
2
3
4
48  
47  
46  
45  
44  
43  
42  
41  
DDQ3  
XTALIN  
14.318  
MHz  
REF0  
USBCLK  
IOCLK  
OSC.  
V
SS  
XTALOUT  
STOP  
CPU  
PLL  
XTALIN  
V
CPUCLK [0-3]  
VDDCPU  
SS  
LOGIC  
5
6
7
XTALOUT  
REF1  
CPUCLK0  
CPUCLK1  
PWR_DWN  
SEL0  
V
V
DDQ3  
DDCPU  
PCICLK_F  
CPUCLK2  
CPUCLK3  
8
V
SS  
SEL1  
SEL2  
9
SDRAM [0-5]  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
EPROM  
SYS PLL  
10  
11  
12  
PCICLK0  
PCICLK1  
PCICLK2  
V
SS  
SDRAM0  
SDRAM1  
V
CPU_STOP  
/2 or /2.5  
Delay  
13  
14  
15  
16  
17  
18  
PCICLK3  
DDQ3  
V
DDQ3  
SDRAM2  
SDRAM3  
EPCICLK  
PCICLK4  
PCI_STOP  
V
SS  
V
SS  
STOP  
LOGIC  
PCICLK [0-5]  
PCICLK_F  
EPCICLK  
SDRAM4  
SDRAM5  
V
SS  
V
19  
20  
21  
22  
23  
24  
30  
29  
28  
27  
26  
25  
DDQ3  
V
DDQ3  
PWR_DWN  
CPU_STOP  
PCI_STOP  
USBCLK  
IOCLK  
SEL1  
V
SERIAL  
SS  
V
SEL0  
SS  
/2  
SCLK  
INTERFACE  
CONTROL  
LOGIC  
SDATA  
SCLK  
SEL2  
SDATA  
Intel and Pentium are registered trademarks of Intel Corporation.  
I2C is a trademark of Philips Corporation.  
Cypress Semiconductor Corporation  
•
3901 North First Street  
•
San Jose  
•
CA 95134  
•
408-943-2600  
October 12, 1998  
1234567...12

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