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參數(shù)資料
| 型號： | ICS9248-199 |
| 英文描述： | Frequency Generator for SIS 735/740 with AMD K7 Processor |
| 中文描述： | 頻率發(fā)生器與AMD k7的處理器為SIS的740分之735 |
| 文件頁數(shù)： | 1/21頁 |
| 文件大?。?/td> | 181K |
| 代理商： | ICS9248-199 |
ICS9248-199
Integrated
Circuit
Systems, Inc.
0376E—12/23/02
Frequency Generator for SIS 735/740 with AMD K7 Processor
Recommended Application:
Main system clock for SIS 735/740 with
AMD K7 chipset.
Output Features:
1 - CPU @ 2.5V
1 - Differential pair open drain CPU clock
1 - IOAPIC @ 2.5V
1 - SDRAM @ 3.3V
6- PCI @3.3V
2 - AGP @ 3.3V
1- 48MHz, @3.3V fixed
1- 24/48MHz, @3.3V selectable by I
2
C
(Default is 24MHz)
2- REF @3.3V, 14.318MHz
Pin Configuration
48-Pin 300mil SSOP
VDDREF
REF0
*FS1/REF1
GND
GND
X1
X2
GND
VDDPCI
PCICLK1
PCICLK2
GND
PCICLK3
PCICLK4
VDDAGP
AGPCLK0
AGPCLK1
GND
VDD48
48MHz
AGPSEL/ 24_48MHz
GND
2
2
*FS0/
2
2
FS2/PCICLK_F
FS3/PCICLK0
**FS4/
**
**
**
2
VDDLAPIC
IOAPIC*
GND
VDDL
CPUCLKT0
CPUCLKC0
GND
VDDL
CPUCLK
GND
NC
NC
VDDSDR
SDRAM
GND
PCI_STOP#
CPU_STOP#
PD#
SDRAM_STOP#
AGP_STOP#
SDATA
SCLK
GND
VDD
2
2
2
I
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
Note:
Please see full table on page 4.
Frequency Table
Features:
Programmable output frequency.
Programmable output divider ratios.
Programmable output rise/fall time.
Programmable output skew.
Programmable spread percentage for EMI control.
Watchdog timer technology to reset system
if system malfunctions.
Programmable watch dog safe frequency.
Support I
2
C Index read/write and block read/write
operations.
Uses external 14.318MHz crystal.
Skew Specifications:
CPU - CPU: < 175ps
PCI - PCI: < 500ps
CPU - SDRAM: < 250ps
AGP - AGP: <175ps
CPU - AGP, PCI: 1-4ns
* These are double strength.
** (1X/2X) have single or double strength to
drive 2 loads.
1. Internal pull-up, of 120K to V
DD
.
2. These inputs have a 120K pull down to GND.
Bit 2
FS4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Bit 7
FS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Bit 6 Bit 5
FS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Bit 4
FS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPU
SDRAM
PCI
AGP
SEL = 0
66.66
66.66
66.66
66.66
66.66
66.66
66.66
66.66
67.20
62.00
69.00
60.00
62.50
66.66
60.00
60.00
60.00
67.27
68.67
68.67
66.95
68.67
66.95
66.95
71.33
71.33
71.33
73.33
73.33
73.33
66.68
66.66
AGP
SEL = 1
50.00
50.00
55.60
50.00
50.00
50.00
50.00
50.00
56.00
46.50
46.00
50.00
50.00
55.30
50.00
48.00
45.00
50.45
51.50
51.56
51.45
50.21
50.21
50.21
53.50
53.50
53.50
55.00
55.00
55.00
55.57
50.00
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
66.66
100.00
166.66
133.33
66.66
100.00
100.00
133.33
112.00
124.00
138.00
150.00
100.00
133.33
150.00
160.00
90.00
100.90
103.00
133.90
137.33
137.33
100.90
133.90
107.00
107.00
142.66
110.00
110.00
146.66
166.70
200.00
66.66
100.00
166.66
133.33
100.00
66.66
133.33
100.00
112.00
124.00
138.00
150.00
166.66
166.66
100.00
120.00
90.00
100.90
103.00
133.90
103.00
137.33
133.90
100.90
107.00
142.66
142.66
110.00
146.66
146.66
125.00
200.00
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.60
31.00
34.50
30.00
31.25
33.33
30.00
30.00
30.00
33.63
34.33
33.48
34.33
34.33
33.48
33.48
35.66
35.66
35.66
36.66
36.66
36.66
31.25
33.33
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