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參數(shù)資料
| 型號： | MK1449SITR |
| 英文描述： | Sound/SCSI+Fast Ethernet Clock |
| 中文描述： | 聲音/快速以太網(wǎng)時鐘的SCSI |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 60K |
| 代理商： | MK1449SITR |
MK1449B
Sound/SCSI+Fast Ethernet Clock
MDS 1449B C
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126 (408)295-9800tel www.icst.com
1
Revision 120799
Printed 11/15/00
Packaged as 8 pin SOIC
For Fast Ethernet plus SCSI on computer
motherboards
For AC97 sound on computer motherboards
Less than 1 ppm synthesis error
Input crystal frequency of 14.31818 MHz
Operating voltages of 3.0 to 5.5V
Available in industrial temperature
Full CMOS level outputs with 25mA drive
capability at TTL levels
Ideal for oscillator replacement
Advanced, low power CMOS process
The MK1449B is the most cost effective way to
generate high quality, high frequency clock
outputs for SCSI plus Fast Ethernet devices, or
AC97 sound chips. Using Phase-Locked-Loop
(PLL) techniques, the device uses a standard
fundamental mode, inexpensive 14.31818 MHz
crystal or clock to produce two output clocks.
The device can accept either a crystal or clock
input. Also on the chip is the ability to generate a
1.25x clock of the reference plus the reference,
making it possible to generate 20 and 25 MHz
clocks from a 20 MHz crystal.
Block Diagram
Description
Features
CLK2
Crystal
Oscillator
VDD
GND
PLL
Clock
Synthesis
and Control
Circuitry
Output
Buffer
14.31818MHz
crystal
or clock
CLK1
X2
X1
S1, S0
2
Output
Buffer
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