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ICS557G-05ATR Datasheet(PDF) 1 Page - Integrated Circuit Systems

Part # ICS557G-05ATR
Description  Quad Differential PCI-Express Clock Source
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS557G-05ATR Datasheet(HTML) 1 Page - Integrated Circuit Systems

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ICS557-05A
MDS 557-05A E
1
Revision 011606
Integrated Circuit Systems, Inc.
● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
Quad Differential PCI-Express Clock Source
Description
The ICS557-05A is a spread-spectrum clock generator
that supports PCI-Express requirements. It is used in
PC or embedded systems to substantially reduce
electro-magnetic interference (EMI). The device
provides four differential HCSL or LVDS high-frequency
outputs with spread spectrum capability. The output
frequency and spread type are selectable using
external pins.
Features
• Packaged in 20-pin TSSOP
• Available in Pb (lead) free package
• Supports PCI-Express applications
• Four differential spread spectrum clock outputs
• Spread spectrum for EMI reduction
• Uses external 25 MHz clock or crystal input
• Power down pin turns off chip
• OE control tri-states outputs
• Spread and frequency selection via external pins
• Spread Bypass option available
• Industrial temperature range available
Block Diagram
Spread
Spectrum/
Output
clock
selection
CLKOUTA
CLKOUTA
Rr(IREF)
PLL Clock
Synthesis
3
GND
VDD
Clock
Oscillator
X1
SEL[2:0]
Spread
Spectrum
Circuitry
2
2
CLKOUTB
CLKOUTD
X2
25 MHz
crystal or
clock
OE
PD
Optional tuning crystal
capacitors
CLKOUTD
CLKOUTC
CLKOUTC
CLKOUTB


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