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ICST - Quad Differential PCI-Express Clock Source

Numéro de référence ICS557-05A
Description Quad Differential PCI-Express Clock Source
Fabricant ICST 
Logo ICST 





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ICS557-05A fiche technique
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ICS557-05A
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
VDD
2
PD OE
3
SEL[2:0]
25 MHz
crystal or
clock
X1
X2
Optional tuning crystal
capacitors
Spread
Spectrum/
Output
clock
selection
Clock
Oscillator
Spread
Spectrum
Circuitry
PLL Clock
Synthesis
2
GND
Rr(IREF)
CLKOUTA
CLKOUTA
CLKOUTB
CLKOUTB
CLKOUTC
CLKOUTC
CLKOUTD
CLKOUTD
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

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