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557G-05ALF Datasheet

QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE

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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


Renesas Electronics Components Datasheet

557G-05ALF Datasheet

QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE

No Preview Available !

ICS557-05A
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
Pin Assignment
VDDXD
1
S0
2
S1
3
S2
4
X1
5
X2
6
PD
7
OE
8
GNDXD
9
IREF
10
20
CLKA
19
CLKA
18
CLKB
17
CLKB
16
GNDODA
15
VDDODA
14
CLKC
13
CLKC
12
CLKD
11
CLKD
20-pin (173 mil) TSSOP
Spread Spectrum Selection Table
S2 S1 S0 Spread% Spread Type
00 0
-0.5
Down
00 1
-1.0
Down
01 0
-1.5
Down
0 1 1 No Spread Not Applicable
10 0
-0.5
Down
10 1
-1.0
Down
11 0
-1.5
Down
1 1 1 No Spread Not Applicable
Output
Frequency
100
100
100
100
200
200
200
200
PCIE SSCG
IDT® QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
2
ICS557-05A REV O 112111


Part Number 557G-05ALF
Description QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
Maker Renesas
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557G-05ALF Datasheet PDF






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