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參數(shù)資料
| 型號： | W164 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Spread Spectrum Desktop/Notebook System Frequency Generator(寬頻譜桌上型電腦/筆記本電腦系統(tǒng)頻率發(fā)生器) |
| 中文描述： | 擴(kuò)頻桌面/筆記本電腦系統(tǒng)頻率發(fā)生器（寬頻譜桌上型電腦/筆記本電腦系統(tǒng)頻率發(fā)生器） |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 136K |
| 代理商： | W164 |
Spread Spectrum Desktop/Notebook System
Frequency Generator
Key Specifications
W164
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
December 16, 1999, rev. **
408-943-2600
Features
Maximized EMI suppression using Cypress’s Spread
Spectrum technology
Reduces measured EMI by as much as 10 dB
I
2
C programmable to 153 MHz (16 selectable
frequencies)
Two skew-controlled copies of CPU output
SEL100/66# selects CPU frequency (100 or 66.8 MHz)
Seven copies of PCI output (synchronous w/CPU
output)
One copy of 14.31818-MHz IOAPIC output
One copy of 48-MHz USB output
Selectable 24-/48-MHz output is determined by resistor
straps on power-up
One high-drive output buffer that produces a copy of
the 14.318-MHz reference
Isolated core VDD pin for noise reduction
Supply Voltages:....................................... V
DDQ3
= 3.3V±5%
V
DDQ2
= 2.5V±5%
CPU Cycle to Cycle Jitter:...........................................200 ps
CPU, PCI Output Edge Rate:
.........................................≥
1 V/ns
CPU0:1 Output Skew: ................................................175 ps
PCI_F, PCI1:6 Output Skew: .......................................500 ps
CPU to PCI Skew: ..............................1 to 4 ns (CPU Leads)
REF2X/SEL48#, SCLOCK, SDATA ................250-k
pull-up
Note:
Internal pull-up resistors should not be relied upon for
setting I/O pins HIGH.
Table 1. Pin Selectable Frequency
SEL100/66#
CPU(0:1)
PCI
1
100 MHz
33.3 MHz
0
66.8 MHz
33.4 MHz
Pin Configuration
Block Diagram
X1
X2
GND
PCI_F
PCI1
PCI2
PCI3
PCI4
VDDQ3
PCI5
PCI6
VDDQ3
48MHz
24/48MHz
GND
REF2X/SEL48#
VDDQ3
VDDQ2
IOAPIC
VDDQ2
CPU0
CPU1
VDDQ3
GND
SDATA
SCLOCK
SEL100/66#
GND
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VDDQ3
REF2X/SEL48#
VDDQ3
IOAPIC
CPU0
CPU1
GND
PCI_F
XTAL
OSC
PLL Ref Freq
PLL 1
100/66#_SEL
X2
X1
VDDQ3
PCI1
PCI2
PCI3
PCI4
PCI5
48MHz
24/48MHz
PLL2
VDDQ2
PCI6
GND
GND
VDDQ3
GND
I
2
C
SCLOCK
SDATA
LOGIC
÷2/÷3/÷4
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