ICS181-03 Datasheet, PDF (2/6 Pages) Integrated Circuit Systems – Low EMI Clock Generator

ICS181-03
LOW EMI CLOCK GENERATOR
Pin Assignment
CLKIN 1
NC 2
GND 3
SS% 4
8 SSON#
7 FS1
6 VDD
5 CLKOUT
8-pin (150 mil) SOIC
Spread Spectrum Select Table
SS%
(Pin 4)
0
1
Spread
Direction
Down
Down
Spread
Percentage (%)
-1.25%
-3.75%
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)
46-60
58-75
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
CLKIN
NC
GND
SS%
CLKOUT
VDD
FS1
SSON#
Pin Type
Pin Description
Input
—
Power
Input
Output
Power
Input
Input
Clock Input.
No connect. Do not connect this pin to anything.
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 181-03 A
2
Revision 110404
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