Sound/SCSI+Fast Ethernet Clock
MK1449B Sound/SCSI+Fast Ethernet Clock
Description
The MK1449B is the most cost effective way to generate high quality, ...
Description
MK1449B Sound/SCSI+Fast Ethernet Clock
Description
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.
Features
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
Block Diagram
VDD GND
2 S1, S0 PLL Clock Synthesis and Control Circuitry Crystal Oscillator
X2
Output Buffer
CLK1
14.31818MHz crystal X1 or clock
Output Buffer
CLK2
1 Revision 120799 Printed 11/15/00 Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126 (408)295-9800tel www.icst.com
MDS 1449B C
MK1449B Sound/SCSI+Fast Ethernet Clock
Pin Assignment
X1/ICLK VDD GND CLK2 1 2 3 4 8 7 6 5 X2 S1 S0 CLK1
Clock Decoding Table (MHz)
S1 0 0 1 1 S0 0 1 0 1 CLK1 tes...
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