ICS557-03
PCI-E
XPRESS
C
LOCK
S
OURCE
Pin Assignment
S0
S1
SS0
X1/ICLK
X2
OE
GNDXD
SS1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDDXD
CLK0
CLK0
GNDODA
VDDODA
CLK1
CLK1
IREF
Output Select Table 1(MHz)
S1
0
0
1
1
S0
0
1
0
1
CLK(1:0), CLK(1:0)
25M
100M
125M
200M
Spread Selection Table 2
SS1
0
0
1
1
SS0
0
1
0
1
Spread %
Center ±0.25
Down -0.5
Down -0.75
No Spread
16-pin (173 mil) TSSOP
Pin Descriptions
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
Input
Input
Input
Input
Input
Power
Input
Pin Description
Select pin 0. See Table1. Internal pull-up resistor.
Select pin 1. See Table 1. Internal pull-up resistor.
Spread Select pin 0. See Table 2. Internal pull-up resistor.
Crystal or clock input. Connect to a 25 MHz crystal or single ended clock.
Output enable tri-states outputs and device is not shut down. Internal
pull-up resistor.
Connect to ground.
Spread Select pin 1. See Table 2. Internal pull-up resistor.
Output Crystal connection. Leave unconnected for clock input.
Output Precision resistor attached to this pin is connected to the internal current
reference.
Output HCSL compliment clock output.
Output HCSL clock output.
Power
Power
Connect to voltage supply +3.3 V for output driver and analog circuits
Connect to ground.
Output HCSL compliment clock output.
Output HCSL clock output.
Power
Connect to voltage supply +3.3 V for crystal oscillator and digital circuit.
MDS 557-03 E
In te grated Circuit Systems
●
2
525 Ra ce Street, San Jose, CA 9512 6
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Revision 061005
tel (4 08) 297-1 201
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ICS [ INTEGRATED CIRCUIT SYSTEMS ]
