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参数资料
| 型号： | IMISC643AYB |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | SSOP-48 |
| 文件页数： | 1/12页 |
| 文件大小： | 138K |
| 代理商： | IMISC643AYB |
SC643
I
2C Clock Generator for 3 DIMM, Pentium
II Designs
Approved Product
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.6
6/20/97
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 1 of 12
PRODUCT FEATURES
Supports Pentium, Pentium Pro and Cyrix
CPUs.
4 CPU / AGP clocks
Up to 12 SDRAM clocks for 3 DIMs.
7 PCI synchronous clocks.
Optional common or mixed supply mode:
(Vdd = Vddq3 = Vddq2 = 3.3V) or
(Vdd = Vddq3 = 3.3V, Vddq2 = 2.5V)
< 250ps skew among CPU or SDRAM clocks.
< 250ps skew among PCI clocks.
I2C 2-Wire serial interface
Programmable registers featuring:
- Jumperless frequency selection
- enable/disable each output pin
- mode as tri-state, test, or normal
Power Management Capability.
IOAPIC clocks for multiprocessor support.
48 MHz for USB support
48-pin SSOP package
BLOCK DIAGRAM
FREQUENCY TABLE (MHz)
FTS = 1
FTS = 0
S2
S1
S0
CPU
PCI
CPU
PCI
0
61.8
30.9
62.4
31.2
0
1
75
30
78**
39**
0
1
0
83.3**
33.3**
85.8**
42.8**
0
1
68.5
34.25
69.5
34.74
1
0
55
27.5
83.3**
41.7**
1
0
1
75
37.5
75
a.32
1
0
60
30
*
1
66.8
33.4
50
25
* Reserved for IMI use only
** Available for 3.3V @ ambient only
CONNECTION DIAGRAM
Vdd
1
REF0
2
Vss
3
XIN
4
SDRAM11
17
SDRAM10
18
Vddq319
SDRAM9
20
XOUT
5
Vddq36
PCI_F/ S1
7
PCI0 / S2
8
Vss
9
PCI1 / FTS
10
PCI2
11
PCI3
12
PCI4
13
Vddq314
PCI5 / PS#
15
Vss
16
SDRAM8
21
Vss
22
SDATA
23
SDCLK
24
Vddq2
48
IOAPIC
47
REF1 / CS#
46
Vss
45
CPU0
44
CPU1
43
Vddq2
42
CPU2
41
CPU3
40
Vss
39
SDRAM0
38
SDRAM1
37
Vddq3
36
SDRAM2
35
SDRAM3
34
Vss
33
SDRAM4
32
SDRAM5
31
Vddq3
30
SDRAM6
29
SDRAM7
28
Vss
27
48MHz / S0
26
24 MHz / Mode
25
24 MHz
PLL2
48 MHz
CS#
FTS
PS#
S2
S1
PLL1
S0
MODE
B
CPU (0:3)
VDDq2
4
B
PCI (0:5)
6
dly
PCI_F
B
SDRAM(0:11)
12
Sdata
Sdlck
REF
XIN
XOUT
REF0
REF1
IOAPIC
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