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參數(shù)資料
| 型號： | CY2220PVC-2 |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | 133-MHz Spread Spectrum Clock Synthesizer/Driver With Differential CPU Outputs |
| 中文描述： | 133 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56 |
| 封裝： | SSOP-56 |
| 文件頁數(shù)： | 2/11頁 |
| 文件大小： | 128K |
| 代理商： | CY2220PVC-2 |
CY2220
Document #: 38-07206 Rev. *A
Page 2 of 11
Pin Summary
Name
V
SSREF
V
DDREF
V
SSPCI
V
DDPCI
V
SS3V66
V
DD3V66
V
SSUSB
V
DDUSB
V
SSCPU
V
DDCPU
V
SSMEM
V
DDMEM
AV
SS
AV
DD
I
REF
XTALIN
[1]
XTALOUT
[1]
CPUCLK [0
–
3]
CPUCLK [0
–
3]B
PCICLK [0
–
9]
Pins
1
4
7, 13, 19
10, 16, 22
32, 33
29, 36
24
27
40, 46
43, 49
53
56
37
38
39
5
6
42, 45, 48, 51
41, 44, 47, 50
8, 9, 11, 12, 14, 15, 17,
18, 20, 21
55
54
30, 31, 34, 35
25, 26
Description
3.3V Reference ground
3.3V Reference voltage supply
3.3V PCI ground
3.3V PCI voltage supply
3.3V AGP and Hub Link ground
3.3V AGP and Hub Link voltage supply
3.3V USB ground
3.3V USB voltage supply
3.3V CPU ground
3.3V CPU voltage supply
3.3V Memory ground
3.3V Memory voltage supply
Analog ground for PLL and Core
Analog voltage supply to PLL and Core
Reference current for external biasing
Reference crystal input
Reference crystal feedback
CPU clock outputs
Inverse CPU clock outputs
PCI clock outputs, synchronously running at 33.33 MHz
MemRef
MemRefB
3V66_ [0
–
3]
USBCLK [0
–
1]/Sel[A
–
B]
MemRef clock output, drives memory clock generator
MemRefB clock output 180 degrees out of phase with MemRef
AGP and Hub Link clock outputs, running at 66 MHz
Sel [A
–
B] inputs are sensed then internally latched on power-up be-
fore the pins are used for 48-MHz USB clock outputs
MultSel[0
–
1] inputs are sensed then internally latched on power-up
before the pins are Reference clock outputs, 14.318 MHz
Active LOW input, powers down part when asserted
Active LOW input, enables spread spectrum when asserted
CPU frequency select input (See Function Table)
REFCLK[0
–
1]/MultSel[0
–
1]
2, 3
PWR_DWN
SPREAD
[2]
SEL133
28
52
23
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.
”
Input is static HIGH or LOW. Frequency of toggling cannot exceed 30 MHz.
2.
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