IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
Frequency Configuration
Table 3A. Frequency Configuration Examples
Input Frequency or
Crystal Frequency
(MHz)
Input Clock
Divider
P
Input Clock
Prescaler
PS
Feedback
Divider
M
Output
Divider
N
VCO
Frequency
(MHz)
Output Frequencies
(MHz)
30.72
61.44
62.5
30.72
30.72
25
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
5
1
1
1
1
1
1
1
1
1
1
1
1
2
1
2
5
1
2
1
1
1
1
1
2
5
1
1
1
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x1
x2
x2
x2
x2
x2
x1
x1
x2
x2
x2
x2
x2
x1
x1
x2
x1
x2
x2
x1
x1
x2
x2
x2
x2
x1
x2
x2
x2
x2
32
32
40
40
50
40
40
32
40
48
44
42
40
64
50
50
50
36
48
40
36
36
90
40
40
40
48
64
32
32
50
40
40
36
150
90
40
40
32
40
40
40
64
50
40
64
32
32
32
32
20
20
16
16
18
16
14
16
16
16
16
16
12
12
12
12
12
12
10
10
8
1966.08
1966.08
2000
76.8
30.72
25
2457.6
2500
78.125
100
25
2000
106.25
122.8
125
26.5625
30.72
25
2125
1966.08
2000
133.33
148.5
150
25
2400
27
2376
25
2100
153.6
155.52
30.72
19.44
25
2457.6
2488.32
2500
156.25
100
2500
125
2500
159.375
160
26.5625
20
1912.5
1920
166.66
25
2000
30.72
61.44
25
2211.84
2211.84
2250
184.32
187.5
200
25
2000
212.5
250
26.5625
25
2125
2000
300
25
8
2400
19.44
77.76
155.52
25
8
2488.32
2488.32
2488.32
2500
311.04
312.5
8
8
8
125
8
2500
156.25
26.5625
25.78125
25
8
2500
318.75
322.265625
375
6
1912.5
1933.59375
2250
6
6
400
25
5
2000
425
26.5625
30.72
30.72
122.88
153.6
19.44
25
5
2125
491.52
4
1966.08
2457.6
2457.6
2457.6
2488.32
2500
4
614.4
4
4
622.08
625
4
4
1228.88
30.72
2
2457.6
NOTE: Each device supports 4 output frequencies (with related input or crystal value) as selected from this table Register Settings.
NOTE: XTAL operation: fOUT = fREF * PS * M / N; CLK, nCLK input operation: fOUT = (fREF / P) * PS * M / N.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
4
©2014 Integrated Device Technology, Inc.