ICS7151
Spread Spectrum Clock Generator
Pin Assignment
XIN
GND
S0
S1
1
2
3
4
8
7
6
5
8 pin (150 mil) SOIC
XOUT
VDD
ENS
CKOUT
Spread Direction and Percentage
Select Table
S1
Pin 4
(note1)
0
0
1
1
ENS
(note 2)
S0
Pin 3
(note1)
0
1
0
1
Spread
Direction
Center
Center
Down
Down
Spread
Percentage (%)
±1.5
±0.5
-1.0
-3.0
Spread Spectrum
OFF
ON
0
1
Notes:
1. The modulation rate varies with input frequency.
2. Spread will default to ON when ENS pin is left open.
Pin Descriptions
Pin
Number
Pin
Name
Pin Type
Pin Description
1
2
3
4
5
6
7
8
XIN
GND
S0
S1
CKOUT
ENS
VDD
XOUT
Input
Power
Input
Input
Output
Input
Power
Output
Resonator connection pin/clock input pin.
Connect to ground.
Select pin 0. Modulation rate setting pin.
Select pin 1. Modulation rate setting pin.
Modulated clock output pin.
Modulation enable setting pin. Internal pull-up resistor.
Connect to +3.3 V.
Resonator connection pin.
MDS 7151 E
Integrated Circuit Systems, Inc.
●
2
525 Race Street, San Jose, CA 95126
●
Revision 012306
tel (408) 297-1201
●
www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
