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ICS650R-21 데이터시트(PDF) 1 Page - Integrated Circuit Systems

부품명 ICS650R-21
상세설명  System Peripheral Clock Source
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제조업체  ICST [Integrated Circuit Systems]
홈페이지  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS650R-21 데이터시트(HTML) 1 Page - Integrated Circuit Systems

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ICS650-21
System Peripheral Clock Source
MDS 650-21 A
1
Revision 010301
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800tel • www.icst.com
PRELIMINARY INFORMATION
The ICS650-21 is a low cost, low jitter, high
performance clock synthesizer for system
peripheral applications. Using analog/digital
Phase-Locked Loop (PLL) techniques, the device
accepts a parallel resonant 25 MHz crystal input to
produce up to eight output clocks. The device
provides clocks for PCI, SCSI, Fast Ethernet,
Ethernet, USB, and AC97. The user can select one
of three USB frequencies, and also one of two
AC97 audio frequencies. The OE pin puts all
outputs into a high impedance state for board level
testing. All frequencies are generated with less than
one ppm error, meeting the demands of SCSI and
Ethernet clocking.
The ICS650 can be mask customized to produce
any frequencies from 1 to 150 MHz.
Block Diagram
Description
Features
• Packaged in 20 pin tiny SSOP (QSOP)
• Lower jitter version of ICS650-01
• Operating VDD of 3.3V or 5V
• Zero ppm synthesis error in all clocks
• Inexpensive 25 MHz crystal or clock input
• Provides Ethernet and Fast Ethernet clocks
• Provides SCSI clocks
• Provides PCI clocks
• Selectable AC97 audio clock
• Selectable USB clock
• OE pin tri-states the outputs for testing
• Selectable frequencies on three clocks
• Duty cycle of 45/55 for Processor clock and Audio
clock
• Advanced, low power CMOS process
Crystal
Oscillator
Clock
Synthesis
Circuitry
Output
Buffer
USB Clock
Output
Buffers
Audio Clock
Processor Clocks
(Fast Ethernet,
SCSI, PCI )
Output
Buffer
2
PSEL1:0
25 MHz
crystal
or clock
X1/ICLK
X2
25 MHz
Output
Buffer
3
ASEL
USEL
20 MHz
Output
Buffers
Output Enable (all outputs)


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