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参数资料
| 型号： | IMISG522BX |
| 厂商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 120 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| 封装： | 0.300 INCH, PLASTIC, SOIC-16 |
| 文件页数： | 9/12页 |
| 文件大小： | 122K |
| 代理商： | IMISG522BX |
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
Rev. 2.0
5/25/2000
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
Page 6 of 12
http:/www.imicorp.com
Modulation Rate Calculation
The input frequency, Fin, at pin 2 (OSCin) and the correlating formula determine the modulation rate, Fmod, of the
SG52x series. Refer to the formulae below:
If OSCin = 14.318 MHz, then;
Fmod = OSCin/(4 x 114) =
31.40kHz
If OSCin = 48.00 MHz, then;
Fmod = OSCin/(12 x 114) =
35.09kHz
If OSCin = 44.24 MHz, then;
Fmod = OSCin (48/44.24)/(12 x144) =
35.09kHz
SG521 Frequency and Spread Selection Truth Table
TEST "0"
(pin 16)
MPCLK(S3)
"1" (pin 14)
PRCLK(S2)
"1" (pin 12)
SS_SEL "1"
(pin 10)
S4 "1"
(pin 5)
S1 "0"
(pin 8)
S0 "0"
(pin 7)
OSCin.(MHz)
(pin 2)
PRCLK (MHz)
(pin 12)
SPREAD
1.25%
3.25%
0
X
0
44.24
16.685345
0
X
0
1
44.24
40.044828
0
X
1
0
44.24
25.028017
0
X
1
44.24
30.033621
0
1
0
X
0
14.318
10.001544
0
1
0
X
0
1
14.318
20.003088
0
1
0
X
1
0
14.318
25.003860
0
1
0
X
1
14.318
50.007721
0
1
X
0
14.318
10.001544
0
1
X
0
1
14.318
20.003088
0
1
X
1
0
14.318
25.003860
0
1
X
1
14.318
50.007721
0
1
0
X
0
48
10.000000
0
1
0
X
0
1
48
20.000000
0
1
0
X
1
0
48
25.000000
0
1
0
X
1
48
50.000000
0
1
0
1
X
0
48
10.000000
0
1
0
1
X
0
1
48
20.000000
0
1
0
1
X
1
0
48
25.000000
0
1
0
1
X
1
48
50.000000
0
1
0
X
0
44.24
10.011207
0
1
0
X
0
1
44.24
20.022414
0
1
0
X
1
0
44.24
25.028017
0
1
0
X
1
44.24
50.056034
0
1
X
0
44.24
10.011207
0
1
X
0
1
44.24
20.022414
0
1
X
1
0
44.24
25.028017
0
1
X
1
44.24
50.056034
1
X
0
N/A
0 (PD)
N/A
1
X
0
1
N/A
1 (PD)
N/A
1X
X
1
0
N/A
TEST
N/A
1
X
1
N/A
Hi-Z
N/A
Table 2
.
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