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CY28341

更新时间: 2024-11-17 22:50:39
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 双倍数据速率时钟
页数 文件大小 规格书
21页 191K
描述
Universal Single-Chip Clock Solution for VIA P4M266/KM266 DDR Systems

CY28341 数据手册

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CY28341  
Universal Single-Chip Clock Solution for VIA P4M266/KM266  
DDR Systems  
Features  
Table 1. Frequency Selection Table  
FS(3:0)  
0000  
0001  
0010  
0011  
0100  
0101  
0110  
0111  
1000  
1001  
1010  
1011  
1100  
1101  
1100  
1111  
CPU  
66.80  
AGP  
66.80  
66.80  
60.00  
66.67  
72.00  
70.00  
64.00  
70.00  
77.00  
73.33  
60.00  
60.00  
60.00  
66.67  
66.67  
66.67  
PCI  
• Supports VIA P4M266/KM266 chipsets  
• Supports Pentium® 4, Athlon™ processors  
• Supports two DDR DIMMS  
• Supports three SDRAMS DIMMS at 100 MHz  
• Provides:  
33.40  
33.40  
30.00  
33.33  
36.00  
35.00  
32.00  
35.00  
38.50  
36.67  
30.00  
30.00  
30.00  
33.33  
33.33  
33.33  
100.00  
120.00  
133.33  
72.00  
105.00  
160.00  
140.00  
77.00  
110.00  
180.00  
150.00  
90.00  
100.00  
200.00  
133.33  
— Two different programmable CPU clock pairs  
— Six differential SDRAM DDR pairs  
— Three low-skew/low-jitter AGP clocks  
— Seven low-skew/low-jitter PCI clocks  
— One 48M output for USB  
— One programmable 24M or 48M for SIO  
• Dial-a-Frequency™ and Dial-a-dB features  
• SpreadSpectrumforbestelectromagneticinterference  
(EMI) reduction  
• Watchdog feature for systems recovery  
• SMBus-compatible for programmability  
• 56-pin SSOP and TSSOP packages  
[1]  
Block Diagram  
Pin Configuration  
VDDR  
XIN  
XOUT  
1
2
3
4
5
6
7
8
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  
*FS0/REF0  
VSSR  
VTTPWRGD#/REF1  
VDDR  
VSSC  
CPUT/CPUOD_T  
CPUC/CPUOD_C  
VDDC  
REF(0:1)  
VDDI  
XTAL  
FS2  
REF0  
XIN  
XOUT  
VDDAGP  
AGP0  
*SELP4_K7/AGP1  
AGP2  
VSSAGP  
**FS1/PCI_F  
**SELSDR_DDR/PCI1  
CPUCS_T/C  
FS0  
VDDC  
SELP4_K7#  
VDDI  
CPU(0:1)/CPU0D_T/C  
PLL1  
CPUCS_C  
CPUCS_T  
VSSI  
FBOUT  
BUF_IN  
DDRT0/SDRAM0  
DDRC0/SDRAM1  
DDRT1/SDRAM2  
DDRC1/SDRAM3  
VDDD  
9
VDDPCI  
PCI(3:6)  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
FS3 FS1  
*MULTSEL/PCI2  
VSSPCI  
PCI3  
PCI_F  
MULTSEL  
PD#  
PCI2  
PCI4  
VDDPCI  
PCI5  
PCI1  
VDDAGP  
AGP(0:2)  
PCI6  
VSSD  
VSS48M  
**FS3/48M  
**FS2/24_48M  
VDD48M  
VDD  
VSS  
IREF  
*PD#/SRESET#  
SCLK  
DDRT2/SDRAM4  
DDRC2/SDRAM5  
DDRT3/SDRAM6  
DDRC3/SDRAM7  
VDDD  
VDD48M  
48M  
SDATA  
SCLK  
SMBus  
PLL2  
/ 2  
WDEN  
VSSD  
24_48M  
DDRT4/SDRAM8  
DDRC4/SDRAM9  
DDRT5/SDRAM10  
DDRC5/SDRAM11  
SRESET#  
VDDD  
WD  
SDATA  
SELSDR_DDR  
FBOUT  
S2D  
DDRT(0:5)/SDRAM(0,2,4,6,8,10)  
DDRC(0:5)/SDRAM(1,3,5,7,9,11)  
56 pin SSOP  
Buf_IN  
CONVERT  
Note:  
1. Pins marked with [*] have internal pull-up resistors. Pins marked with [**] have internal pull-down resistors.  
Cypress Semiconductor Corporation  
3901 North First Street  
San Jose  
CA 95134  
408-943-2600  
Document #: 38-07367 Rev. *A  
Revised December 26, 2002  

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