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CY2318BNZ PDF预览

CY2318BNZ

更新时间: 2024-11-25 04:37:59
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 动态存储器PC
页数 文件大小 规格书
8页 97K
描述
18 Output, 3.3V SDRAM Buffer for Desktop PCs with 4 DIMMs

CY2318BNZ 数据手册

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CY2318BNZ  
18 Output, 3.3V SDRAM Buffer for  
Desktop PCs with 4 DIMMs  
Functional Description  
Features  
• One input to 18 output buffer/driver  
• Supports up to four SDRAM DIMMs  
• Two additional outputs for feedback  
• SMBus interface for individual output control  
• Low skew outputs (< 200 ps)  
The CY2318BNZ is a 3.3V buffer designed to distribute  
high-speed clocks in PC applications. The part has 18 outputs,  
16 of which can be used to drive up to four SDRAM DIMMs,  
and the remaining can be used for external feedback to a PLL.  
The device operates at 3.3V and outputs can run up to 100  
MHz, thus making it compatible with Pentium II® processors.  
The CY2318BNZ can be used in conjunction with the CY2280,  
CY2281, CY2282 or similar clock synthesizer for a complete  
Pentium II motherboard solution.  
• Up to 100 MHz operation for Industrial temperatures  
• Up to 133 MHz operation for Commercial temperatures  
• Dedicated OE pin for testing  
The CY2318BNZ also includes an SMBus interface which can  
enable or disable each output clock. On power-up, all output  
clocks are enabled (internal pull up). A separate Output Enable  
pin facilitates testing on ATE.  
• Space-saving 48-pin SSOP package  
• 3.3V operation  
Block Diagram  
Pin Configuration  
SSOP  
Top View  
1
NC  
NC  
48  
47  
NC  
NC  
V
SDRAM15  
SDRAM14  
BUF_IN  
2
SDRAM0  
SDRAM1  
3
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
V
DD  
DD  
4
SDRAM0  
SDRAM1  
5
SDRAM2  
SDRAM3  
6
V
V
SS  
SS  
7
V
V
DD  
DD  
SDRAM4  
SDRAM5  
SDRAM6  
SDRAM7  
SDRAM8  
8
SDRAM2  
SDRAM3  
SDRAM13  
SDRAM12  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
V
SDATA  
V
SS  
SS  
BUF_IN  
OE  
SMBus  
Decoding  
V
V
DD  
DD  
SDRAM9  
SDRAM4  
SDRAM5  
SDRAM11  
SDRAM10  
SCLOCK  
SDRAM10  
SDRAM11  
V
V
SS  
SS  
V
V
DD  
DD  
SDRAM12  
SDRAM13  
SDRAM14  
SDRAM15  
SDRAM6  
SDRAM7  
SDRAM9  
SDRAM8  
V
V
SS  
SS  
V
V
DD  
DD  
SDRAM16  
SDRAM17  
SDRAM16  
SDRAM17  
V
V
SS  
SS  
V
V
OE  
DDIIC  
SDATA  
SSIIC  
SCLOCK  
Pentium II is a registered trademark of Intel Corporation.  
Cypress Semiconductor Corporation  
Document #: 38-07217 Rev. **  
3901 North First Street  
San Jose  
CA 95134  
408-943-2600  
Revised December 4, 2001  

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