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參數(shù)資料
| 型號： | IMISC662AAB |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PQFP52 |
| 封裝： | QFP-52 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大?。?/td> | 147K |
| 代理商： | IMISC662AAB |
SC662
Clock Generator for Power PC Designs with SDRAM and USB Support
Preliminary Product Information
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.1
4/11/97
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 1 of 5
PRODUCT FEATURES
n
Supports Pentium and Cyrix CPU’s.
n
16 host clocks for additional SDRAM support.
n
Optional common or mixed supply mode :
VDD = VDDRM = VDDCPU = VDDIO = 3.3V
VDD = VDDRM = VDDCPU = 3.3V, VDDIO = 2.5V
VDD = VDDRM = 3.3V, VDDCPU = VDDIO = 2.5V
VDD = 3.3V, VDDRM = VDDCPU = VDDIO = 2.5V
n
< 250 pS skew on CPU and SDRM* buffers
n
< 350 pS skew on PCI buffers
n
Buffer output impedance < 20 ohm
n
52 Pin QFP package for minimum board space and
easy layout
BLOCK DIAGRAM
FREQUENCY TABLE
Sel2
Sel1
Sel0
CPU
PCI
0
tristate
0
1
75
a.32
0
1
0
55
27.5
0
1
75
37.5
1
0
50
25
1
0
1
60
30
1
0
66.6
33.3
1
test
a.32 = Asynchronous PCI.
Tristate = All outputs tristate except XOUT.
CONNECTION DIAGRAM
PLL2
48MHz
S2
S1
S0
PLL1
B
CPU(1:4)
VDDCPU
4
B
SDRM(1:4)
4
VDDRM
B
PCI(1:8)
8
dly
B
SDRM(5:8)
4
B
SDRM(9:12)
4
REF
XIN
XOUT
REF (1:2)
IOAPIC
VDDIO
1
REF1
REF2
2
3
4
5
6
7
8
9
10
11
VSS
XOUT
XIN
VDD
SEL2
VDD
VSS
SEL1
SEL0
VSS
12
13
VDDRM
39
VSS
38
SDRM8
37
SDRM7
36
SDRM6
35
SDRM5
34
VSS
33
SDRM4
32
SDRM3
31
SDRM2
30
SDRM1
29
VDDRM
28
VSS
27
V
D
P
C
I
8
P
C
I
7
P
C
I
6
P
C
I
5
P
C
I
4
P
C
I
3
P
C
I
1
P
C
I
2
V
D
V
D
V
S
52 51 50 49 48 47 46 45 44 43 42 41 40
14 15 16 17 18 19 20 21 22 23 24 25 26
2
V
D
R
M
V
S
C
P
U
4
C
P
U
3
C
P
U
2
C
P
U
1
V
D
C
P
U
I
O
A
P
I
C
S
D
R
M
1
0
V
S
D
R
M
9
S
D
R
M
1
S
D
R
M
1
2
4
8
M
H
z
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