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W164_02

更新时间: 2024-11-21 03:18:03
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 电脑
页数 文件大小 规格书
12页 138K
描述
Spread Spectrum Desktop/Notebook System Frequency Generator

W164_02 数据手册

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W164  
Spread Spectrum Desktop/Notebook System  
Frequency Generator  
Features  
Key Specifications  
• Maximized EMI suppression using Cypress’s Spread  
Spectrum technology  
Supply Voltages:....................................... VDDQ3 = 3.3V±5%  
VDDQ2 = 2.5V±5%  
• Reduces measured EMI by as much as 10 dB  
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-kpull-up  
• I2C 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  
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)  
100 MHz  
66.8 MHz  
PCI  
• Isolated core VDD pin for noise reduction  
1
0
33.3 MHz  
33.4 MHz  
Block Diagram  
Pin Configuration  
VDDQ3  
X1  
X2  
1
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
GND  
REF2X/SEL48#  
GND  
2
REF2X/SEL48#  
VDDQ3  
VDDQ2  
IOAPIC  
VDDQ2  
CPU0  
GND  
3
PCI_F  
PCI1  
4
X1  
X2  
XTAL  
OSC  
VDDQ3  
IOAPIC  
5
PCI2  
6
PLL Ref Freq  
PCI3  
7
PCI4  
8
CPU1  
VDDQ3  
PCI5  
9
VDDQ3  
GND  
10  
11  
12  
13  
14  
PCI6  
SDATA  
VDDQ3  
48MHz  
24/48MHz  
SCLOCK  
SEL100/66#  
GND  
VDDQ2  
CPU0  
CPU1  
GND  
100/66#_SEL  
PLL 1  
÷2/÷3/÷4  
VDDQ3  
PCI_F  
PCI1  
PCI2  
PCI3  
PCI4  
PCI5  
PCI6  
GND  
2
SDATA  
SCLOCK  
I C  
LOGIC  
VDDQ3  
48MHz  
PLL2  
24/48MHz  
GND  
Cypress Semiconductor Corporation  
3901 North First Street  
San Jose  
CA 95134  
408-943-2600  
Document #: 38-07169 Rev. *A  
Revised December 15, 2002  

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