ICS181-02
L
OW
EMI C
LOCK
G
ENERATOR
Pin Assignment
X1/CLKIN
X2
GND
SS%
1
2
3
4
8
7
6
5
SSON#
FS1
VDD
CLKOUT
Spread Spectrum Select Table
SS%
(Pin 4)
0
1
Spread
Direction
Down
Down
Spread
Percentage (%)
-1.25%
-3.75%
8-pin (150 mil) SOIC
0 = connect to GND
1 = connect directly to VDD
Note: SS% pin has an internal pull-up resistor
Frequency Range Selection Table
FS1
(Pin 7)
0
1
Frequency Range Selection
(MHz)
28-38
38-48
Pin Descriptions
Pin
Number
Pin
Name
Pin Type
Pin Description
1
2
3
4
5
6
7
8
X1/CLKIN
X2
GND
SS%
CLKOUT
VDD
FS1
SSON#
Input
Output
Power
Input
Output
Power
Input
Input
Crystal or Clock Input.
Crystal output. Float for a clock input.
Connect to ground.
Select pin for spread amount. See table above. Internal pull-up resistor.
Spread spectrum clock output per table above.
Connect to 3.3 V or 5 V.
Select pin for input frequency. See table above. Internal pull-up resistor.
Spread Spectrum Control. This pin enables spread spectrum when low.
Internal pull-down resistor.
MDS 181-02 A
2
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Revision 110404
te l (4 08) 297 -1 201
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w w w. i c s t . c o m
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ICS [ INTEGRATED CIRCUIT SYSTEMS ]
