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MK1449STR Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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MK1449STR Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 4 page 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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