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Integrated Device Technology Electronic Components Datasheet

ICS557-03 Datasheet

2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE

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2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE
DATASHEET
ICS557-03
Description
The ICS557-03 is a spread spectrum clock generator that
supports PCI-Express Gen 1 and Ethernet requirements.
The device is used for PC or embedded systems to
substantially reduce electromagnetic interference (EMI).
The device provides two differential (HCSL) spread
spectrum outputs. The spread type and amount are
configured via select pin. Using IDT’s patented
Phase-Locked Loop (PLL) techniques, the device takes a
25 MHz crystal input and produces two pairs of differential
outputs at 25 MHz, 100 MHz, 125 MHz or 200 MHz clock
frequencies for HCSL, and 25 MHz or 100 MHz for LVDS.
Features
Packaged in 16-pin TSSOP
RoHS 5 (green) or RoHS 6 (green and lead free)
compliant packaging
Supports HCSL or LVDS output levels
Operating voltage of 3.3 V
Input frequency of 25 MHz
Jitter 60 ps (cycle-to-cycle)
Spread Spectrum capability
Industrial and commercial temperature ranges
For PCIe Gen2 applications, see the 5V41065
For PCIe Gen3 applications, see the 5V41235
Block Diagram
VDD
2
SS1:SS0
2
S1:S0
2
Control
Logic
Phase Lock Loop
X1/ICLK
25 MHz
crystal or clock X2
Clock
Buffer/
Crystal
Oscillator
Optional tuning crystal
capacitors
2
GND
OE
CLK0
CLK0
CLK1
CLK1
Rr(IREF)
IDT® 2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE
1
ICS557-03 REV U 112111


Integrated Device Technology Electronic Components Datasheet

ICS557-03 Datasheet

2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE

No Preview Available !

ICS557-03
2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE
PCIE SSCG
Pin Assignment
S0
S1
SS0
X1/ICLK
X2
OE
GNDXD
SS1
1
2
3
4
5
6
7
8
16 VDDXD
15 CLK0
14 CLK0
13 GNDODA
12 VDDODA
11 CLK1
10 CLK1
9 IREF
16-pin (173 mil) TSSOP
Pin Descriptions
Output Select Table 1 (MHz)
S1 S0 CLK(1:0), CLK(1:0)
00
25M
01
100M
10
125M
11
200M
Spread Selection Table 2
SS1 SS0 Spread%
00
No Spread
01
Down -0.5
10
Down -0.75
11
No Spread
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
Name
S0
S1
SS0
X1/ICLK
X2
OE
GNDXD
SS1
IREF
CLK1
CLK1
VDDODA
GNDODA
CLK0
CLK0
VDDXD
Pin
Type
Pin Description
Input Select pin 0. See Table1. Internal pull-up resistor.
Input Select pin 1. See Table 1. Internal pull-up resistor.
Input Spread Select pin 0. See Table 2. Internal pull-up resistor.
Input Crystal or clock input. Connect to a 25 MHz crystal or single ended clock.
Output Crystal connection. Leave unconnected for clock input.
Input Output enable. Tri-states outputs and device is not shut down. Internal
pull-up resistor.
Power Connect to ground.
Input Spread Select pin 1. See Table 2. Internal pull-up resistor.
Output Precision resistor attached to this pin is connected to the internal current
reference.
Output HCSL complimentary clock output 1.
Output HCSL true clock output 1.
Power Connect to voltage supply +3.3 V for output driver and analog circuits
Power Connect to ground.
Output HCSL complimentary clock output 0.
Output HCSL true clock output 0.
Power Connect to voltage supply +3.3 V for crystal oscillator and digital circuit.
IDT® 2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE
2
ICS557-03 REV U 112111


Part Number ICS557-03
Description 2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE
Maker IDT
Total Page 11 Pages
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