Pentium II, System Clock Generator with 2 DIMM Support and SSCG
Approved Product
PRODUCT FEATURES
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FREQUENCY TABLE (MHz)
SELECTORS
OUTPUTS (MHz)
CPU
55.00
75.01
59.99
66.60
Supports Pentium, Pentium II, Pentium-Pro, AMD
and Cyrix CPUs.
Supports Intel chipset requirements.
Supports Sychronous DRAM designs
4 host (CPU/AGP) clocks & 8 SDRAM clocks.
Optional common or mixed supply mode :
(Vdd = Vdd3 = Vdd4 = Vdd2 = 3.3V)
(Vdd = Vdd3 = Vdd4 = 3.3V, Vdd2 = 2.5V)
< 250 pS skew on CPU buffers
< 250 pS skew on PCI buffers
Supports Single Pin Power Management.
Integrates
Spread Spectrum
Technology for
reduced EMI.
48 Pin SSOP package for minimum board space
S1
0
0
1
1
S0
0
1
0
1
PCI
27.50
37.50
30.00
33.30
CONNECTION DIAGRAM
REF2
REF1
Vss
Xin
Xout
Test
Vdd4
PCICLK_F
PCICLK1
Vss
PCICLK2
PCICLK3
PCICLK4
PCICLK5
Vdd4
PCICLK6
Vss
S0
S1
SSon
Vdd4
48 MHz
24 Mhz
Vss
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
Vdd
REF3
Vdd2
IOAPIC
PWR_DWN#
Vss
CPUCLK1
CPUCLK2
Vdd2
CPUCLK3
CPUCLK4
Vss
SDRAM1
SDRAM2
Vdd3
SDRAM3
SDRAM4
Vss
SDRAM5
SDRAM6
Vdd3
SDRAM7
SDRAM8
Vdd
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BLOCK DIAGRAM
XIN
B
REF
3
REF(1:3)
IOAPIC
XOUT
Vdd2
S1
S0
SSon
Spread
Spectrum
PLL1
dly
B
B
4
8
CPUCLK(1:4)
SDRAM (1:8)
PCICLK_F
B
6
PCICLK(1:6)
PWR_DWN#
24 MHz
48 MHz
PLL2
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Rev.1.3
4/8/97
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