
Precision Audio Clock Source
MDS 661 D
2
Revision 111804
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
●
tel (408) 297-1201
●
www.icst.com
ICS661
Pin Assignment
16-pin 4.40 mil body, 0.50 mm pitch TSSOP
Output Clock Selection Table
Pin Descriptions
12
1
11
2
10
X1/REFIN
X2
3
9
VDD
4
VDD
REF
5
S0
6
VDDR
7
GND
8
GND
GND
SELIN
VDDO
S3
S1
S2
CLK
16
15
14
13
S3
S2
S1
S0
Input
Frequency
(MHz)
Output
Frequency
(MHz)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
8.192
11.2896
12.288
24.576
12.288
16.9344
18.432
36.864
16.384
22.5792
24.576
49.152
24.576
33.8688
36.864
73.728
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
2
3
4
5
6
7
8
9
X1/REFIN
VDD
VDD
S0
GND
GND
S3
S2
CLK
S1
VDDO
SELIN
GND
VDDR
REF
X2
Input
Power
Power
Input
Power
Power
Input
Input
Output
Input
Power
Input
Power
Power
Output
Input
Connect this pin to a crystal or clock input
Power supply for crystal oscillator.
Power supply for PLL.
Output frequency selection. Determines output frequency per table above. On chip pull-up.
Connect to ground.
Ground for output stage.
Output frequency selection. Determines output frequency per table above. On chip pull-up.
Output frequency selection. Determines output frequency per table above. On chip pull-up.
Clock output.
Output frequency selection. Determines output frequency per table above. On chip pull-up.
Power supply for output stage.
Low for clock input, high for crystal. On chip pull-up.
Connect to ground.
Power supply for reference output. Ground to turn off REF.
Reference clock output.
Connect this pin to a crystal. Leave open if using a clock input.
10
11
12
13
14
15
16