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ICS650R-21T Datasheet

  • ICS650R-21T

  • System Peripheral Clock Source

  • 4頁

  • ICS

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PRELIMINARY INFORMATION
ICS650-21
System Peripheral Clock Source
Description
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.
Features
鈥?Packaged in 20 pin tiny SSOP (QSOP)
鈥?Lower jitter version of ICS650-01
鈥?Operating VDD of 3.3V or 5V
鈥?Zero ppm synthesis error in all clocks
鈥?Inexpensive 25 MHz crystal or clock input
鈥?Provides Ethernet and Fast Ethernet clocks
鈥?Provides SCSI clocks
鈥?Provides PCI clocks
鈥?Selectable AC97 audio clock
鈥?Selectable USB clock
鈥?OE pin tri-states the outputs for testing
鈥?Selectable frequencies on three clocks
鈥?Duty cycle of 45/55 for Processor clock and Audio
clock
鈥?Advanced, low power CMOS process
Block Diagram
PSEL1:0
ASEL
USEL
25 MHz
crystal
or clock
X1/ICLK
2
Output
Buffer
Clock
Synthesis
Circuitry
Output
Buffer
Output
Buffers
Output
Buffers
Output
Buffer
3
Processor Clocks
(Fast Ethernet,
SCSI, PCI )
Audio Clock
USB Clock
20 MHz
25 MHz
Crystal
Oscillator
X2
Output Enable (all outputs)
MDS 650-21 A
1
Revision 010301
Integrated Circuit Systems, Inc. 鈥?525 Race Street 鈥?San Jose 鈥A鈥?5126鈥?(408) 295-9800tel 鈥?www.icst.com

ICS650R-21T 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器

  • -

  • 時(shí)鐘/頻率合成器

  • 是

  • 時(shí)鐘，晶體

  • CMOS

  • 1

  • 1:8

  • 無/無

  • 66.67MHz

  • 無/無

  • 3 V ~ 5.5 V

  • 0°C ~ 70°C

  • 表面貼裝

  • 20-SSOP（0.154"，3.90mm 寬）

  • 20-QSOP

  • 帶卷 (TR)

  • 650R-21T

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