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CY2287

更新时间： 2024-11-27 21:54:39
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 驱动器动态存储器时钟
页数 文件大小 规格书
13页 151K
描述
100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support

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中文翻译

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CY2287 数据手册

 浏览型号CY2287的Datasheet PDF文件第2页浏览型号CY2287的Datasheet PDF文件第3页浏览型号CY2287的Datasheet PDF文件第4页浏览型号CY2287的Datasheet PDF文件第5页浏览型号CY2287的Datasheet PDF文件第6页浏览型号CY2287的Datasheet PDF文件第7页 
CY2287  
100-MHz Spread Spectrum Clock Synthesizer/Driver with  
USB, Hublink, and SDRAM Support  
Features  
Benefits  
• Mixed 2.5V and 3.3V Operation  
Usable with Pentium II, K6, and 6x86 Processors  
• Multiple output clocks at different frequencies  
— Three CPU clocks at 2.5V, up to 100 MHz  
— Nine 3.3V SDRAM clocks at 100 MHz  
Single-chip main motherboard clock generator  
— High-Speed Processor Support  
— Supports Two 4-Clock SDRAM DIMMs  
— Support for Six PCI Slots  
— Eight synchronous PCI clocks at 33 MHz  
— Two synchronous APIC clocks at 16.67 MHz or 33  
MHz  
— Synchronous to the CPU Clock  
— Hublink Support  
— Two 3V66 clocks at 66 MHz  
— Two USB clocks at 48 MHz  
— One reference clock at 14.318 MHz  
— Universal Serial Bus Support  
— Also used as an input strap to determine APIC frequency  
• Spread Spectrum clocking  
Enables reduction of EMI  
— 31 kHz modulation frequency  
— EPROM programmable percentage of spreading  
— Default is –0.6%, which is recommended by Intel®  
— Additional options of –0.25% and –0.4% available  
• Power-down features  
Supports mobile systems  
2
• I C™ Interface  
Dynamic output control  
• Low skew and low jitter outputs  
• Test Mode  
Meets tight system timing requirements at high frequency  
Enables ATE and “bed of nails” testing  
Widely available, standard package enables lower cost  
• 56-pin SSOP package  
SSOP  
Top View  
Logic Block Diagram  
V
SSAPIC  
1
2
3
4
5
6
56  
55  
54  
53  
52  
51  
50  
REF0/SEL33  
REF0/SEL33 (14.318 MHz)  
APIC0  
APIC1  
V
DDREF  
XTAL_IN  
XTAL_OUT  
V
DDAPIC  
CPU0  
V
V
SSREF  
CPU [0–2] (66/100 MHz)  
SDRAM [0-8] (100 MHz)  
V
SS3V66  
DDCPU  
CPU1  
CPU2  
3V66_0  
3V66_1  
7
49  
48  
47  
46  
45  
44  
43  
8
XTALIN  
14.318  
MHz  
OSC.  
CPU  
PLL  
V
DD3V66  
9
V
V
SSCPU  
EPROM  
Configurable  
Logic  
V
DDPCI  
SSSDRAM  
10  
11  
XTALOUT  
PCI0  
PCI1  
SDRAM0  
SDRAM1  
12  
13  
PCI [0–7] (33MHz)  
SEL0  
SEL1  
V
PCI2  
DDSDRAM  
EPROM  
SDRAM2  
SDRAM3  
14  
15  
16  
17  
18  
V
SSPCI  
42  
41  
PCI3  
APIC [0–1] (16.67/33MHz)  
PCI4  
V
SSSDRAM  
SDRAM4  
SDRAM5  
40  
39  
38  
37  
36  
35  
34  
V
V
SSPCI  
PCI5  
3V66 [0–1] (66MHz)  
USB [0–1] (48MHz)  
PWR_DWN  
PCI6  
PCI7  
19  
20  
21  
V
DDSDRAM  
SDRAM6  
SYS  
PLL  
SDRAM7  
DDPCI  
AV  
DD  
22  
23  
24  
25  
V
SSSDRAM  
AV  
SS  
SDRAM8  
V
V
33  
32  
31  
SSUSB  
USB0  
USB1  
DDUSB  
DDSDRAM  
SCLK  
SERIAL INTERFACE  
CONTROL LOGIC  
PWRDWN  
SCLK  
SDATA  
26  
27  
28  
V
SDATA  
SEL1  
30  
29  
SEL0  
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  
June 23, 1999  
1234567...13

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