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参数资料
| 型号： | CY2215 |
| 厂商： | Cypress Semiconductor Corp. |
| 英文描述： | 133-MHz Spread Spectrum Frequency Timing Generator(133MHz 宽频谱定时发生器) |
| 中文描述： | 133 - MHz的扩频频率定时发生器（133MHz的宽频谱定时发生器） |
| 文件页数： | 2/8页 |
| 文件大小： | 108K |
| 代理商： | CY2215 |
CY2215
PRELIMINARY
2
Pin Summary
Name
Pins
Description
V
SSREF
V
DDREF
V
SSPCI
V
DDPCI
V
SS66
V
DD66
V
SS48
V
DD48
V
SSCPU
V
DDCPU
V
SSCPU/2
V
DDCPU/2
V
SSAPIC
V
DDAPIC
AV
DD
AV
SS
XTALIN
[1]
XTALOUT
[1]
48
3.3V Reference ground
3
6, 14
3.3V Reference voltage supply
3.3V PCI ground
9, 17
3.3V PCI voltage supply
20
24
3.3V 66 MHz ground
3.3V 66 MHz voltage supply
26
3.3V 48 MHz ground
28
35, 39
3.3V 48 MHz voltage supply
2.5V CPU ground
38, 41
2.5V CPU voltage supply
42
44
2.5V CPU/2 ground
2.5V CPU/2 voltage supply
45
2.5V IOAPIC ground
47
34
2.5V IOAPIC voltage supply
Analog voltage supply to PLL and Core
33
Analog ground
4
5
Reference crystal input
Reference crystal feedback
CPUCLK [0
–
2]
36, 37, 40
CPU clock outputs
PCICLK [1
–
9]
PCICLK_F
8, 10, 11, 12, 13, 15, 16, 18, 19
7
PCI clock outputs, synchronously running at 33.33 MHz
Free running PCI clock
CPUCLK/2
43
CPU/2 clock outputs, drive memory clock generator
66CLK [0-2]
IOAPIC
21, 22, 23
46
66.67 MHz clock outputs
IOAPIC clock output, running at 16.67 MHz
REFCLK [0
–
1]
1,2
Reference clock outputs, 14.318 MHz
48CLK
PWR_DWN
27
32
48 MHz clock output
Active LOW input, powers down part when asserted
SPREAD
31
Active LOW input, enables spread spectrum when asserted
SEL1
SEL0
[2]
30
1
CPU frequency select input (See Function Table)
CPU frequency select input (See Function Table). Internal 50K
pull-up
SEL133
NC
25
29
CPU frequency select input (See Function Table)
No Connect Pin, no internal connection
Notes:
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.
”
Pin 1, SEL0 Function, is only active at power-on.
2.
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