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CY29940AXCT

更新时间: 2024-11-25 04:13:19
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 时钟
页数 文件大小 规格书
7页 256K
描述
2.5V or 3.3V, 200-MHz, 1:18 Clock Distribution Buffer

CY29940AXCT 数据手册

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CY29940  
2.5V or 3.3V, 200-MHz, 1:18 Clock Distribution Buffer  
Features  
Description  
• 200-MHz clock support  
The CY29940 is a low-voltage 200-MHz clock distribution buff-  
er with the capability to select either a differential LVPECL or  
a LVCMOS/LVTTL compatible input clock. The two clock  
sources can be used to provide for a test clock as well as the  
primary system clock. All other control inputs are LVC-  
MOS/LVTTL compatible. The eighteen outputs are 2.5V or  
3.3V LVCMOS/LVTTL compatible and can drive 50series or  
parallel terminated transmission lines. For series terminated  
transmission lines, each output can drive one or two traces  
giving the device an effective fanout of 1:36. Low out-  
put-to-output skews make the CY29940 an ideal clock distri-  
bution buffer for nested clock trees in the most demanding of  
synchronous systems.  
• LVPECL or LVCMOS/LVTTL clock input  
• LVCMOS/LVTTL compatible inputs  
• 18 clock outputs: drive up to 36 clock lines  
• 60 ps typical output-to-output skew  
• Dual or single supply operation:  
— 3.3V core and 3.3V outputs  
— 3.3V core and 2.5V outputs  
— 2.5V core and 2.5V outputs  
• Pin compatible with MPC940L, MPC9109  
• Available in Commercial and Industrial temperature  
• 32-pin LQFP package  
Block Diagram  
Pin Configuration  
VDD  
VDDC  
PECL_CLK  
PECL_CLK#  
0
1
VSS  
VSS  
TCLK  
1
2
3
4
5
6
7
8
24  
23  
22  
Q6  
Q7  
Q8  
VDD  
18  
Q0-Q17  
TCLK  
TCLK_SEL  
PECL_CLK  
PECL_CLK#  
VDD  
CY29940 210 Q9  
TCLK_SEL  
19  
18  
17  
Q10  
Q11  
VSS  
VDDC  
Pin Description[1]  
Pin  
Name  
PWR  
I/O  
Description  
5
6
3
PECL_CLK  
PECL_CLK#  
TCLK  
I, PU PECL Input Clock  
I, PD PECL Input Clock  
I, PD External Reference/Test Clock Input  
Clock Outputs  
9, 10, 11, 13, 14, Q(17:0)  
15, 18, 19, 20, 22,  
23, 24, 26, 27, 28,  
30, 31, 32  
VDDC  
O
4
TCLK_SEL  
I, PD Clock Select Input. When LOW, PECL clock is selected and when HIGH  
TCLK is selected.  
8, 16, 29  
7, 21  
VDDC  
VDD  
VSS  
3.3V or 2.5V Power Supply for Output Clock Buffers  
3.3V or 2.5V Power Supply  
1, 2, 12, 17, 25  
Common Ground  
Note:  
1. PD = Internal Pull-Down, PU = Internal Pull-up  
Cypress Semiconductor Corporation  
Document #: 38-07283 Rev. *C  
198 Champion Court  
San Jose, CA 95134-1709  
408-943-2600  
Revised April 4, 2006  
[+] Feedback  

CY29940AXCT 替代型号

型号 品牌 替代类型 描述 数据表
CY29940AXC CYPRESS

完全替代

2.5V or 3.3V, 200-MHz, 1:18 Clock Distribution Buffer
CY29942AXI CYPRESS

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CY29940AXI CYPRESS

功能相似

2.5V or 3.3V, 200-MHz, 1:18 Clock Distribution Buffer

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