+/+…when timing is critical
C9809B
Low EMI Clock Generator for Intel 133MHz/3DIMM 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])
13 copies of SDRAM Clock (SDRAM[0:12])
5 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
56 Pin SSOP
Block Diagram
Table1
XIN
*Will be set to 133 MHz, I2C Byte3, Bit0 is set to a Logic 1.
**Sel0 also controls TS# functionality if TS# is 0 at power up.
Pin Configuration
36pF
300K
36pF
XOUT
VDD
REF / SEL1
1
IOAPIC
VDDI
VSS
REF / Sel1
VDD
1
2
3
4
5
6
7
8
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
VSS
VDDC
CPU0
CPU1
VDDI
IOAPIC
S1
apic
cpu
1
2
VSS
Xin
Xout
VSS
VDD
3V66-0
3V66-1
3V66-2
VSS
SDRAM0
SDRAM1
VDDS
VDDC
CPU(0:1)
Rin
9
VSS
SCLK
SDATA
i2c-clk
i2c-data
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SDRAM2
SDRAM3
SDRAM4
SDRAM5
VDDS
VDDS
VDD
SDRAM(0:12)
3V66(0:2)
sdram
3V66
pci
13
3
SEL0
s0
pwr_dwn#
PCI0 / Sel3
PCI1
TS#/PD#
VSS
PCI2
VDD
VSS
PCI3
PCI4
Sel0
VSSA
VDDA
SCLK
SDATA
VSS
SDRAM6
SDRAM7
SDRAM8
SDRAM9
VDDS
VDD
VDD
VDD
PCI(0:4)
DOT
5
1
1
PLL1
Rin
48
VSS
SDRAM10
SDRAM11
VDDS
PD#
USB
i2c-clk
i2c-data
VSS
SDRAM12
TS#/PD#
DOT
PLL2
VDD
USB / Sel2
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
3/8/2000
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