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W254B

更新时间: 2024-11-14 03:17:59
品牌 Logo 应用领域
赛普拉斯 - CYPRESS /
页数 文件大小 规格书
17页 250K
描述
133-MHz Spread Spectrum FTG for Mobile Pentium㈢ III Platforms

W254B 数据手册

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W254B  
133-MHz Spread Spectrum FTG for  
Mobile Pentium® III Platforms  
APIC, 48-MHz, 3V66, PCI Outputs  
Features  
Cycle-to-Cycle Jitter: ...................................................500 ps  
• Maximized EMI suppression using Cypress’s Spread  
Spectrum technology (–0.5% and ±0.5%)  
CPU Output Skew: ......................................................150 ps  
3V66 Output Skew: .....................................................175 ps  
APIC, SDRAM Output Skew: ......................................250 ps  
PCI Output Skew:........................................................500 ps  
VDDQ3 (REF, PCI, 3V66, 48 MHz, SDRAM):.........3.3V±5%  
VDDQ2 (CPU, APIC):....... 2.5V±5%in Selectable Frequency  
Table 1. Pin Selectable Frequency  
• Single chip system FTG for Mobile Intel® Platforms  
Two CPU outputs  
Seven copies of PCI clock (one Free Running)  
Seven SDRAM clock (one DCLK for Memory Hub)  
Two copies of 48-MHz clock (non-spread spectrum) op-  
timized for USB reference input and video DOT clock  
Three 3V66 Hublink/AGP outputs  
One VCH clock (48-MHz non-SSC or 66.67-MHz SSC)  
One APIC outputs  
Input  
Address  
Output Frequencies  
FS1 FS0 CPU SDRAM 48MHz PCI APIC REF 3V66  
One buffered reference output  
0
0
1
1
0
1
0
1
66  
100  
100  
133  
100  
Supports frequencies up to 133 MHz  
SMBus interface for programming  
Power management control inputs  
48  
MHz  
33  
MHz  
14.318 66  
MHz MHz  
100  
133  
133  
Key Specifications  
CPU, SDRAM Outputs Cycle-to-Cycle Jitter:.............. 250 ps  
Block Diagram  
Pin Configuration  
VDD_REF  
REF  
PLL Ref Freq  
X1  
X2  
XTAL  
OSC  
REF  
APIC  
VDD_APIC  
VDD_CPU  
CPU  
CPU_F  
GND_CPU  
GND_SDRAM  
SDRAM0  
SDRAM1  
VDD_SDRAM  
SDRAM2  
SDRAM3  
GND_SDRAM  
SDRAM4  
SDRAM5  
DCLK  
VDD_SDRAM  
CPU_STP#  
VDD_REF  
X1  
1
2
3
4
5
6
7
8
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
Divider  
Network  
PLL 1  
VDD_CPU  
CPU  
Stop  
Clock  
X2  
GND_REF  
GND_PCI  
PCI_F/FS0^  
PCI1/FS1^  
PCI2  
Control  
CPU_F  
CPU_STP#  
VDD_APIC  
APIC  
VDD_SDRAM  
DCLK  
VDD_PCI  
PCI3  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
SDRAM0:5  
PCI4  
PCI5  
PCI6  
VDD_PCI  
PCI_F/FS0  
PWR_DWN#  
PCI_STP#  
Stop  
Clock  
Control  
VDD_3V66  
3V66_0  
3V66_1  
3V66_AGP  
GND_3V66  
VCH_CLK  
GND_48  
USB  
PCI1/FS1  
PCI2:6  
VDD_3V66  
3V66_0:1  
PCI_STP#  
PWR_DWN#  
SCLK  
SDATA  
VDD_CORE  
3V66_AGP  
DOT  
VDD_48  
GND_CORE  
VDD_48  
PLL2  
USB (48MHz)  
DOT (48MHz)  
Note:  
SDATA  
SCLK  
SMBus  
Logic  
VCH_CLK  
1. Internal pull-down or pull-up resistors present on inputs  
marked with * or ^ respectively. Design should not rely solely  
on internal pull-up or pull-down resistor to set I/O pins HIGH  
or LOW respectively.  
Intel and Pentium are registered trademarks of Intel Corporation.  
Cypress Semiconductor Corporation  
3901 North First Street  
San Jose  
CA 95134  
408-943-2600  
Document #: 38-07233 Rev. *A  
Revised December 22, 2002  

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