ICS557-03 Datasheet, PDF (2/9 Pages) Integrated Circuit Systems – PCI-EXPRESS CLOCK SOURCE

ICS557-03
PCI-EXPRESS CLOCK SOURCE
Pin Assignment
S0 ¹
S1 2
SS0 3
X1/ICLK 4
X2 5
OE 6
GNDXD ⁷
SS1 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)
0
0
25M
0
1
100M
1
0
125M
1
1
200M
Spread Selection Table 2
SS1 SS0
Spread %
0
0
Center ±0.25
0
1
Down -0.5
1
0
Down -0.75
1
1
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 compliment clock output.
Output HCSL clock output.
Power Connect to voltage supply +3.3 V for output driver and analog circuits
Power 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
2
Revision 061005
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