+/+…when timing is critical
C9825B
Low EMI Clock Generator for Intel 133MHz/ 2DIMM Chipset Systems
Preliminary
Product Features
Frequency Table (MHz)
SEL
PCI
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Designed for Intel’s 133MHz/SDRAM chipset
2 copies of CPU Clock (CPU[0:1])
9 copies of SDRAM Clock (SDRAM[0:8])
6 copies of PCI Clocks
3 copies of 3V66 Clock
1 IOAPIC Clock, synchronous to PCI Clock
1 REF Clock
1 USB Clock (Non SSC)
1 DOT Clock (Non SSC)
IMI Spread Spectrum for best EMI reduction
Dial-a-Frequency™ Feature
Dial-a-dB™ Feature
(3:0)**
CPU
SDRAM 3V66 /IOAPIC
REF
DOT USB
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
66.67
100.00* 66.67
33.33 14.318M 48M 48M
33.33 14.318M 48M 48M
33.33 14.318M 48M 48M
33.33 14.318M 48M 48M
41.67 14.318M 48M 48M
35.64 14.318M 48M 48M
37.50 14.318M 48M 48M
40.32 14.318M 48M 48M
44.95 14.318M 48M 48M
41.67 14.318M 48M 48M
100.00 100.00* 66.67
133.33 133.33 66.67
133.33 100.00* 66.67
83.35
125.02 83.35
106.91 106.91 71.27
150.00 150.00 75.00
120.96 120.96 80.64
89.90
134.86 89.90
125.02 125.02 83.35
200.00 200.00 100.00 50.00 14.318M 48M 48M
116.87 116.87 77.91
100.00 133.33 66.67
112.00 112.00 74.67
166.53 166.53 83.27
140.00 105.00 70.00
38.96 14.318M 48M 48M
33.33 14.318M 48M 48M
37.33 14.318M 48M 48M
41.63 14.318M 48M 48M
35.00 14.318M 48M 48M
48 Pin SSOP
Block Diagram
Table1
*Will be set to 133 MHz, I2C Byte3, Bit0 is set to a Logic 1.
XIN
Pin Configuration
36pF
36pF
300K
VSS
REF / Sel1
VDD
1
2
3
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDI
IOAPIC
VSS
VDDC
CPU0
CPU1
VSS
SDRAM0
SDRAM1
VDDS
XOUT
VDD
REF / Sel1
1
XIN
4
XOUT
VSS
VDD
3V66-0
3V66-1
3V66-2
VSS
5
6
7
8
VDDI
IOAPIC
S1
apic
cpu
1
2
VDDC
9
CPU(0:1)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Rin
VDDS
VDD
VSS
SCLK
SDATA
i2c-clk
i2c-data
SDRAM(0:8)
3V66(0:2)
sdram
13
3
PCI0 / Sel3
PCI1
SDRAM2
SDRAM3
SDRAM4
SDRAM5
VDDS
SEL0
PCI2
VDD
VSS
PCI3
PCI4
PCI5
Sel0
VSS
s0
3V66
pci
VDD
PCI(1:5)
5
1
s2
s3
VSS
PCI0/Sel3
PLL1
SDRAM6
SDRAM7
SDRAM8
DOT
USB / Sel2
VDD
VDD
VDD
DOT
Rin
48
1
1
VDD
SCLK
SDATA
USB/Sel2
VSS
i2c-clk
i2c-data
PLL2
Fig.1
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035, USA. TEL: 408-263-6300, FAX 408-263-6571
http://www.imicorp.com
Rev 1.2
4/12/2000
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