QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
DATASHEET
ICS557-05A
Description
Features
The ICS557-05A is a spread...
Description
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
DATASHEET
ICS557-05A
Description
Features
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.
Block Diagram
Packaged in 20-pin TSSOP RoHS 5 (green) or RoHS 6 (green and lead free)
complaint 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 For PCIe Gen2 applications, see the 5V41066 For PCIe Gen3 applications, see the 5V41236
VDD 2
PD
OE
3 SEL[2:0]
X1
25 MHz
crystal or
clock
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
IDT® QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
1
ICS557-05A REV O 112111
ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
Pin Assignment
VDDXD
1
S0
2
S1
3
S2
4
X1
...
Similar Datasheet