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MK1449STR Datasheet(PDF) 1 Page - Integrated Circuit Systems

Part # MK1449STR
Description  Sound/SCSIFast Ethernet Clock
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

MK1449STR Datasheet(HTML) 1 Page - Integrated Circuit Systems

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MK1449B
Sound/SCSI+Fast Ethernet Clock
MDS 1449B C
1
Revision 120799
Printed 11/15/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408)295-9800tel • www.icst.com
• 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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