ICS18051 Datasheet, PDF (2/6 Pages) Integrated Circuit Systems – Low EMI Clock Generator

ICS180-51
LOW EMI CLOCK GENERATOR
Pin Assignment
Spread Spectrum Select Table
X1/CLKIN 1
X2 2
GND 3
SS% 4
8 FS2
7 FS1
6 VDD
5 CLKOUT
8 pin (150 mil) SOIC
SS%
(Pin 4)
0
1
Spread
Direction
Center
Center
Spread
Percentage (%)
+/-0.625%
+/1.875%
0 = connect to GND
1 = connect directly to VDD
Note: SS% pin has an internal pull-up resistor
Frequency Range Selection Table
FS2 FS1
Frequency
(Pin 8) (Pin 7) Range Selection
(MHz)
0
0
0
1
1
0
1
1
8-10
10-15
15-18
18-28
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
X1/CLKIN
X2
GND
SS%
CLKOUT
VDD
FS1
FS2
Pin Type
Pin Description
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.
Select pin for input frequency. See table above. Internal pull-up resistor.
MDS 180-51 A
2
Revision 110404
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