
ICS180-51
LOW EMI CLOCK GENERATOR
SSCG
IDT / ICS LOW EMI CLOCK GENERATOR
2
ICS180-51
REV C 051310
Pin Assignment
Spread Spectrum Select Table
0 = connect to GND
1 = connect directly to VDD
Note: SS% pin has an internal pull-up resistor
Frequency Range Selection Table
Pin Descriptions
1
2
3
X1/CLKIN
4
X2
GND
FS1
SS%
VDD
CLKOUT
8
7
6
5
FS2
8 pin (150 mil) SOIC
SS%
(Pin 4)
Spread
Direction
Spread
Percentage (%)
0
Center
+/-0.625%
1
Center
+/1.875%
FS2
(Pin 8)
FS1
(Pin 7)
Frequency
Range Selection
(MHz)
00
8-10
0
1
10-15
1
0
15-18
1
18-28
Pin
Number
Pin
Name
Pin Type
Pin Description
1
X1/CLKIN
Input
Crystal or Clock Input.
2
X2
Output
Crystal output. Float for a clock input.
3
GND
Power
Connect to ground.
4
SS%
Input
Select pin for spread amount. See table above. Internal pull-up resistor.
5
CLKOUT
Output
Spread spectrum clock output per table above.
6
VDD
Power
Connect to 3.3 V or 5 V.
7
FS1
Input
Select pin for input frequency. See table above. Internal pull-up resistor.
8
FS2
Input
Select pin for input frequency. See table above. Internal pull-up resistor.