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11257-816 PDF预览

11257-816

更新时间: 2024-11-10 22:08:51
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页数 文件大小 规格书
19页 384K
描述
LOW-SKEW CLOCK FANOUT BUFFER ICs

11257-816 数据手册

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April 1999  
1.0 Features  
2.0 Description  
The FS6050 family of CMOS clock fanout buffer ICs are  
designed for high-speed motherboard applications, such  
as Intel Pentium® II PC100-based systems with 100MHz  
SDRAM.  
Generates up to eighteen low-skew, non-inverting  
clocks from one clock input  
Supports up to four SDRAM DIMMs  
Uses either I2C -bus or SMBus serial interface with  
Read and Write capability for individual clock output  
control  
Up to eighteen buffered, non-inverting clock outputs are  
fanned-out from one clock input. Individual clocks are  
skew matched to less than 250ps at 100MHz. Multiple  
power and ground supplies reduce the effects of supply  
noise on device performance.  
Output enable pin tristates all clock outputs to facili-  
tate board testing  
Under I2C-bus control, individual clock outputs may be  
turned on or off. An active-low output enable is available  
to force all the clock outputs to a tristate level for system  
testing.  
Clock outputs skew-matched to less than 250ps  
Less than 5ns propagation delay  
Output impedance: 17at 0.5VDD  
Serial interface I/O meet I2C specifications; all other  
I/O are LVTTL/LVCMOS-compatible  
Five differerent pin configurations available:  
Figure 2: Pin Configuration (FS6050)  
FS6050: 18 clock outputs in a 48-pin SSOP  
FS6051: 10 clock outputs in a 28-pin SOIC, SSOP  
FS6053: 13 clock outputs in a 28-pin SOIC  
FS6054: 14 clock outputs in a 28-pin SOIC  
FS6050  
Figure 1: Block Diagram (FS6050)  
VDD  
SDRAM_(0:1)  
VSS  
VDD  
VDD_I2C  
SDRAM_(2:3)  
VSS  
VDD  
SDA  
Serial  
Interface  
18  
48-pin SSOP  
SDRAM_(4:5)  
SCL  
VSS  
VDD  
VSS_I2C  
Figure 3: Pin Configuration (FS6051)  
SDRAM_(6:7)  
VSS  
VDD  
CLK_IN  
SDRAM_(8:9)  
VSS  
VDD  
SDRAM_(10:11)  
VSS  
VDD  
SDRAM_(12:13)  
VSS  
VDD  
FS6051  
SDRAM_(14:15)  
VSS  
VDD  
SDRAM_16  
VSS  
VDD  
OE  
SDRAM_17  
VSS  
28-pin SOIC, SSOP  
FS6050  
Additional pin configurations are noted on Page 2.  
Intel and Pentium are registered trademarks of Intel Corporation. I2C is a licensed trademark of Philips Electronics, N.V. American Microsystems, Inc. reserves the right to change the detail specifica-  
tions as may be required to permit improvements in the design of its products.  
4.5.99  
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