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W158

更新时间: 2024-11-20 22:14:55
品牌 Logo 应用领域
赛普拉斯 - CYPRESS /
页数 文件大小 规格书
12页 168K
描述
Spread Spectrum System Frequency Synthesizer

W158 数据手册

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W158  
Spread Spectrum System Frequency Synthesizer  
CPU Output Jitter: ......................................................150 ps  
Features  
CPUdiv2, IOAPIC Output Jitter: ..................................250 ps  
• Maximized EMI suppression using Cypress’s spread  
spectrum technology  
• Intel® CK98 Specification compliant  
• 0.5% downspread outputs deliver up to 10 dB lower EMI  
• Four skew-controlled copies of CPU output  
• Eightcopies ofPCI output(synchronous w/CPU output)  
• Four copies of 66-MHz fixed frequency 3.3V clock  
• Two copies of CPU/2 outputs for synchronous memory  
reference  
• Three copies of 16.67-MHz IOAPIC clock, synchronous  
to CPU clock  
• One copy of 48-MHz USB output  
• Two copies of 14.31818-MHz reference clock  
• Programmable to 133- or 100-MHz operation  
48 MHz, 3V66, PCI Output Jitter:................................500 ps  
CPU0:3, CPUdiv2_ 0:1 Output Skew: .........................175 ps  
PCI_F, PCI1:7 Output Skew: .......................................500 ps  
3V66_0:3, IOAPIC0:2 Output Skew: ...........................250 ps  
CPU to 3V66 Output Offset:........... 0.0 to1.5 ns (CPU leads)  
3V66 to PCI Output Offset:.......... 1.5 to 3.0 ns (3V66 leads)  
CPU to IOAPIC Output Offset: ...... 1.5 to 4.0 ns (CPU leads)  
CPU to PCI Output Offset: ............ 1.5 to 4.0 ns (CPU leads)  
Logic inputs, except SEL133/100#, have 250-kpull-up  
resistors  
[1]  
Table 1. Pin Selectable Frequency  
SEL133/100#  
CPU0:3 (MHz)  
133 MHz  
PCI  
• Powermanagementcontrolpinsforclockstop and shut  
down  
• Available in 56-pin SSOP  
1
0
33.3 MHz  
33.3 MHz  
100 MHz  
Note:  
Key Specifications  
1. See Table 2 for complete mode selection details.  
Supply Voltages: ...................................... V  
V
= 3.3V±5%  
= 2.5V±5%  
DDQ3  
DDQ2  
Block Diagram  
Pin Configuration  
2
X1  
X2  
XTAL  
OSC  
REF0:1  
GND  
REF0  
REF1  
VDDQ3  
X1  
X2  
GND  
PCI_F  
PCI1  
VDDQ3  
PCI2  
PCI3  
GND  
PCI4  
PCI5  
VDDQ3  
PCI6  
1
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
VDDQ2  
IOAPIC2  
IOAPIC1  
IOAPIC0  
GND  
2
3
4
CPU_STOP#  
5
STOP  
Clock  
Logic  
4
6
VDDQ2  
CPU0:3  
CPUdiv2_1  
CPUdiv2_0  
GND  
VDDQ2  
CPU3  
CPU2  
GND  
VDDQ2  
CPU1  
CPU0  
GND  
VDDQ3  
GND  
7
8
9
2
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
÷2  
CPUdiv2_0:1  
3V66_0:3  
SPREAD#  
SEL0  
PLL 1  
SEL1  
STOP  
Clock  
Logic  
4
SEL133/100#  
÷2/÷1.5  
PCI7  
1
7
GND  
PCI_F  
PCI1:7  
GND  
PCI_STOP#  
CPU_STOP#  
PWRDWN#  
SPREAD#  
SEL1  
3V66_0  
3V66_1  
VDDQ3  
GND  
STOP  
Clock  
Logic  
÷2  
PWRDWN#  
PCI_STOP#  
SEL0  
25  
26  
27  
28  
3V66_2  
VDDQ3  
48MHz  
GND  
3V66_3  
VDDQ3  
3
Power  
Down  
Logic  
SEL133/100#  
÷2  
IOAPIC0:2  
Three-state  
Logic  
1
PLL2  
48MHz  
Intel is a registered trademark of Intel Corporation.  
Cypress Semiconductor Corporation  
3901 North First Street  
San Jose  
CA 95134  
408-943-2600  
October 12, 1999, rev. **  

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