ICS843252 データシートの表示（PDF） - Integrated Circuit Systems
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ICS843252 Datasheet PDF : 15 Pages
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
TABLE 3B. BANK B FREQUENCY TABLE
Inputs
Crystal Frequency
(MHz)
25
20
25
24
20
25
25
24
20
19.44
15.625
19.44
18.75
15.625
15.625
19.44
18.75
15.625
FB_SEL
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
SELB1
0
0
0
0
0
1
1
1
1
0
0
0
0
0
1
1
1
1
SELB0
0
0
1
1
1
0
1
1
1
0
0
1
1
1
0
1
1
1
Feedback
Divider
25
25
25
25
25
25
25
25
25
32
32
32
32
32
32
32
32
32
Bank B
Output Divider
2
2
4
4
4
5
8
8
8
2
2
4
4
4
5
8
8
8
M/N
Multiplication
Factor
12.5
12.5
6.25
6.25
6.25
5
3.125
3.125
3.125
16
16
8
8
8
6.4
4
4
4
QB/nQB
Output
Frequency
(MHz)
312.5
250
156.25
150
125
125
78.125
75
62.5
311.04
250
155.52
150
125
100
77.76
75
62.5
TABLE 3C. OUTPUT BANK CONFIGURATION SELECT FUNCTION TABLES
Inputs
SELA1
SELA0
0
0
0
1
1
0
1
1
Outputs
QA
÷1
÷2
÷3
÷4 (default)
Inputs
SELB1
SELB0
0
0
0
1
1
0
1
1
Outputs
QB
÷2
÷4
÷5
÷8 (default)
TABLE 3D. FEEDBACK DIVIDER CONFIGURATION SELECT FUNCTION TABLE
FB_SEL
0
1
Inputs
Feedback Divide
÷25 (default)
÷32
843252AG
www.icst.com/products/hiperclocks.html
4
REV. A NOVEMBER 9, 2005
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