+/+…when timing is critical
C9837
Low EMI Clock Generator for Intel Mobile 133MHz/2 SO-DIMM Chipset Systems
Preliminary
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3- 3V66 Clocks (66.6MHz, 3.3V) ICH, HUBLINK
and AGP memory
Power management using Power Down , CPU Stop
and PCI Stop pins
3 Function Select pins (include test-mode select)
IMI Spread Spectrum for best EMI reduction
I2C Support with read back
Product Features
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•
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•
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Meets Intel’s Mobile 133.3MHz Chipset
2-CPU Clocks (66.6/100/133.3MHz, 2.5V)
4-SDRAM Clocks, 1-DCLK (100/133.3MHz, 3.3V)
2-IOAPIC Clocks, Synchronous to CPU Clock
6-PCI Clocks, and One Free Running
1-REF Clock
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•
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48 Pin SSOP and TSSOP Package
2-48MHz fixed non SSCG Clocks (USB and DOT)
Function Table (MHz)
TEST# SEL1 SEL0
CPU(0,1)
SDRAM(0:3),
DCLK
3V66(0:2)
PCI(F,1:6)
48M(0,1)
REF
IOAPIC(0,1)
0
0
1
1
1
1
X
X
0
0
1
1
0
1
0
1
0
1
Hi-Z
TCLK/2
66.6
100.0
133.3
133.3
Hi-Z
Hi-Z
TCLK/3
66.6
66.6
66.6
Hi-Z
TCLK/6
33.3
33.3
33.3
Hi-Z
TCLK/2
48
Hi-Z
TCLK
14.318
14.318
14.318
14.318
Hi-Z
TCLK/6
33.3
33.3
33.3
TCLK/2
100.0*
100.0*
133.3
48
48
48
100.0*
66.6
33.3
33.3
NOTE: These are the frequencies that are selectable after power up using the SEL1 and SEL0 hardware pins. Other frequencies may be chosen
using the devices I2C interface. See the expanded frequency for a complete listing of all of the availible frequencies
* Will be set to 133MHz, when I2C Byte 3 Bit0 is set to logic 1.
Table 1
Pin Configuration
Block Diagram
XIN
VDD
XIN
XOUT
VSS
SEL0/REF
VSS
IOAPIC0
IOAPIC1
VDDI
CPU0
VDDC
CPU1
1
2
3
4
5
6
7
8
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
36pF
36pF
XOUT
VDD
SEL0/REF
1
2
VDDI
VSS
IOAPIC(0,1)
3V660
3V661
3V662
VDD
ioapic
VDDC
VDDS
VSS
VSS
9
CPU(0,1)
cpu
2
4
Rin
PCI_STP#
SEL1/PCI_F
PCI1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SDRAM0
SDRAM1
VDDS
SDRAM2
SDRAM3
VSS
DCLK
VDDS
CPU_STP#
TEST#
PD#
sdram
SDRAM(0:3)
VDD
TEST#
tristate
s0
s1
3v66
Pci_f
3V66(0:2)
3
1
VSS
PCI2
PCI3
VDDP
PCI4
PCI5
PCI6
AVDD
VSS
VSS
VDDP
pd#
SEL1/PCI_F
PCI_STP#
CPU_STP#
VDDP
VDD
i2c-clk
i2c-data
PCI(1:6)
48M(0,1)
pci
7
2
1
PLL1
Rin
pd#
48
VDDS
PD#
DCLK
SCLK
i2c-clk
i2c-data
SDATA
PLL2
SCLK
SDATA
VDD
48M0(USB)
48M1(DOT)
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035, USA TEL: 408-263-6300, FAX 408-263-6571
http://www.imicorp.com
Rev 1.0
3/30/2000
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