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参数资料
| 型号： | CY2287-1 |
| 厂商： | Cypress Semiconductor Corp. |
| 英文描述： | 100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support |
| 中文描述： | 100 MHz的扩频时钟合成器/驱动器，带有USB接口，Hublink，和SDRAM支持 |
| 文件页数： | 2/13页 |
| 文件大小： | 148K |
| 代理商： | CY2287-1 |
CY2287
2
Pin Summary
Name
REF/SEL33
Pins
1
Description
3.3V 14.31818-MHz clock output and power-on external select strap op-
tion for APIC clock frequency.
Strap LOW: APIC = PCI/2
Strap HIGH: APIC = 33.3 MHz
14.31818-MHz crystal input
XTAL_IN
[1]
XTAL_OUT
[1]
3
4
14.31818-MHz crystal output
PCI [0
–
7]
3V66 [0
–
1]
11, 12, 13, 15, 16, 18, 19, 20
7, 8
3.3V PCI clock outputs
3.3V Fixed 66.67-MHz clock outputs
USB [0
–
1]
25, 26
3.3V Fixed 48-MHz clock outputs
SEL [0
–
1]
PWRDWN
28, 29
32
3.3V LVTTL compatible inputs for logic selection
3.3V LVTTL compatible input. Device enters powerdown mode when held
LOW
CPU [0
–
2]
SDRAM [0
–
8]
49, 50, 52
35, 36, 37, 39, 40, 42, 43, 45, 46
2.5V 66.67-MHz or 100-MHz (selectable) host bus clock output
3.3V SDRAM clock outputs running 100 MHz
APIC [0
–
1]
54, 55
2.5V APIC clock outputs running synchronous with PCI clock frequency.
Selectable 16.67 MHz or 33.3 MHz
I
2
C compatible SDATA input
I
2
C compatible SCLK input
SDATA
30
SCLK
31
V
DDREF
V
SSREF
V
SS3V66
V
DD3V66
V
DDPCI
V
SSPCI
AV
DD
AV
SS
V
SSUSB
V
DDUSB
V
DDSDRAM
V
SSSDRAM
V
SSCPU
V
DDCPU
V
DDAPIC
V
SSAPIC
Note:
1.
For best accuracy, use a parallel-resonant crystal, C
LOAD
= 18 pF. For crystals with different C
LOAD
, please refer to the application note,
“
Crystal Oscillator
Topics.
”
2
5
3.3V Power supply for REF output
REF ground
6
3V66 Ground
9
10, 21
3.3V Power supply for 3V66 outputs
3.3V Power supply for PCI outputs
14, 17
PCI ground
22
23
3.3V Analog power supply
Analog ground
24
USB ground
27
33, 38, 44
3.3V Power supply for USB outputs
3.3V Power supply for SDRAM outputs
35, 41, 47
SDRAM ground
48
51
CPU ground
2.5V Power supply for CPU outputs
53
2.5V Power supply for APIC outputs
56
APIC ground
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相关代理商/技术参数 |
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|---|---|
| CY2287PVC-1 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support |
| CY2291 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Three-PLL General Purpose EPROM Programmable Clock Generator |
| CY2291_02 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Three-PLL General Purpose EPROM Programmable Clock Generator |
| CY2291_08 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Three-PLL General Purpose EPROM Programmable Clock Generator |
| CY2291EFX | 制造商:Cypress Semiconductor 功能描述: |
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