ICS843256 Datasheet, PDF (3/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843256
FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
TABLE 3. CRYSTAL FUNCTION TABLE
Inputs
XTAL (MHz) FB_SEL N_SEL1 N_SEL0
M
20
0
0
0
25
20
0
0
1
25
20
0
1
0
25
20
0
1
1
25
21.25
0
1
1
25
24
0
0
0
25
24
0
0
1
25
24
0
1
0
25
24
0
1
1
25
25
0
0
0
25
25
0
0
1
25
25
0
1
0
25
25
0
1
1
25
25.5
0
1
0
25
15.625
1
1
1
32
18.5625
1
1
1
32
18.75
1
0
0
32
18.75
1
0
1
32
18.75
1
1
0
32
18.75
1
1
1
32
19.44
1
0
0
32
19.44
1
0
1
32
19.44
1
1
0
32
19.44
1
1
1
32
19.53125
1
0
0
32
19.53125
1
0
1
32
19.53125
1
1
0
32
19.53125
1
1
1
32
20
1
1
1
32
Function
VCO (MHz)
N
500
1
500
2
500
4
500
5
531.25
5
600
1
600
2
600
4
600
5
625
1
625
2
625
4
625
5
637.5
4
500
8
594
8
600
1
600
2
600
4
600
8
622.08
1
622.08
2
622.08
4
622.08
8
625
1
625
2
625
4
625
8
640
8
Output (MHz)
500
250
125
100
106.25
600
300
150
120
625
312.5
156.25
125
159.375
62.5
74.25
600
300
150
75
622.08
311.04
155.52
77.76
625
312.5
156.25
78.125
80
843256AM
www.icst.com/products/hiperclocks.html
3
REV. A NOVEMBER 29, 2005