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CLOCK SOURCE. 557G-05ALF Datasheet

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CLOCK SOURCE. 557G-05ALF Datasheet






557G-05ALF SOURCE. Datasheet pdf. Equivalent




557G-05ALF SOURCE. Datasheet pdf. Equivalent





Part

557G-05ALF

Description

QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE



Feature


QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE DATASHEET ICS557-05A Descript ion Features The ICS557-05A is a spre ad-spectrum clock generator that suppor ts PCI-Express requirements. It is used in PC or embedded systems to substanti ally reduce electro-magnetic interferen ce (EMI). The device provides four diff erential HCSL or LVDS high-frequency ou tputs with spread .
Manufacture

Renesas

Datasheet
Download 557G-05ALF Datasheet


Renesas 557G-05ALF

557G-05ALF; spectrum capability. The output frequenc y and spread type are selectable using external pins. Block Diagram • Packa ged in 20-pin TSSOP • RoHS 5 (green) or RoHS 6 (green and lead free) complai nt package • Supports PCI-Express app lications • Four differential spread spectrum clock outputs • Spread spect rum for EMI reduction • Uses external 25 MHz clock or crystal input.


Renesas 557G-05ALF

• Power down pin turns off chip • O E control tri-states outputs • Spread and frequency selection via external p ins • Spread Bypass option available • Industrial temperature range availa ble • For PCIe Gen2 applications, see the 5V41066 • For PCIe Gen3 applicat ions, see the 5V41236 VDD 2 PD OE 3 SEL[2:0] X1 25 MHz crystal or cloc k X2 Optional tuning crystal c.


Renesas 557G-05ALF

apacitors Spread Spectrum/ Output clock selection Clock Oscillator Spread Spe ctrum Circuitry PLL Clock Synthesis 2 G ND Rr(IREF) CLKOUTA CLKOUTA CLKOUTB C LKOUTB CLKOUTC CLKOUTC CLKOUTD CLKOUTD IDT® QUAD DIFFERENTIAL PCI-EXPRESS GE N1 CLOCK SOURCE 1 ICS557-05A REV O 11 2111 ICS557-05A QUAD DIFFERENTIAL PCI- EXPRESS GEN1 CLOCK SOURCE Pin Assignme nt VDDXD 1 S0 2.

Part

557G-05ALF

Description

QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE



Feature


QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE DATASHEET ICS557-05A Descript ion Features The ICS557-05A is a spre ad-spectrum clock generator that suppor ts PCI-Express requirements. It is used in PC or embedded systems to substanti ally reduce electro-magnetic interferen ce (EMI). The device provides four diff erential HCSL or LVDS high-frequency ou tputs with spread .
Manufacture

Renesas

Datasheet
Download 557G-05ALF Datasheet




 557G-05ALF
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




 557G-05ALF
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




 557G-05ALF
ICS557-05A
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
PCIE SSCG
Pin Descriptions
Pin
Pin
Pin
Name
Type
Pin Description
1
VDDXD
Power Connect to +3.3 V digital supply.
2
S0
Input Spread spectrum select pin #0. See table above. Internal pull-up resistor.
3
S1
Input Spread spectrum select pin #1. See table above Internal pull-up resistor.
4
S2
Input Spread spectrum select pin #2. See table above. Internal pull-up resistor.
5
X1
Input Crystal connection. Connect to a fundamental mode crystal or clock input.
6
X2
Output Crystal connection. Connect to a fundamental mode crystal or leave open.
7
PD
Input Powers down all PLL’s and tri-states outputs when low. Internal pull-up resistor.
8
OE
Input Provides output on, tri-states output (High = enable outputs; Low = disable outputs).
Internal pull-up resistor.
9
GND
Power Connect to digital ground.
10
IREF
Output Precision resistor attached to this pin is connected to the internal current reference.
11
CLKD
Output Selectable 100/200 MHz spread spectrum differential Compliment output clock D.
12
CLKD
Output Selectable 100/200 MHz spread spectrum differential True output clock D.
13
CLKC
Output Selectable 100/200 MHz spread spectrum differential Compliment output clock C.
14
CLKC
Output Selectable 100/200 MHz spread spectrum differential True output clock C.
15
VDDODA
Power Connect to +3.3 V analog supply.
16
GND
Power Connect to analog ground.
17
CLKB
Output Selectable 100/200 MHz spread spectrum differential Compliment output clock B.
18
CLKB
Output Selectable 100/200 MHz spread spectrum differential True output clock B.
19
CLKA
Output Selectable 100/200 MHz spread spectrum differential Compliment output clock A.
20
CLKA
Output Selectable 100/200 MHz spread spectrum differential True output clock A.
IDT® QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE
3
ICS557-05A REV O 112111






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