PRELIMINARY
Low EMI 166MHz Clock Generator for SiS630S/Pentium®III/Celeron® Chipsets
Product Features
C9631
Frequency Table (MHz)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
166MHz Clock Support
Supports Pentium III and Celeron CPU’s
Designed to SiS630S Chipset Requirements
3 CPU Clocks
13 SDRAM Clocks (3 DIMM Support)
6 PCI Clocks, One free running
2 AGP Clocks
2 REF Clocks (1x or 2x strength via SMBus)
1 48MHz USB Clock (Non SSC)
1 Programmable SIO 24MHz/ 48MHz (Non SSC)
Cypress Spread Spectrum for best EMI reduction
SMBus Support with read back capabilities
Dial-A-Frequency™ Feature
®
SEL
(3:0)*
CPU
(0:2)
SDRAM
(0:12)
PCI
(_F, 1:5)
REF
(0:1)
AGP(0,1)
AGP_SEL=0
AGP_SEL=1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
66.67
100.00
166.67
133.30
66.67
66.67
100.00
166.67
133.30
100.01
66.67
33.34
33.33
33.33
33.33
33.34
33.33
33.33
33.33
33.60
31.00
34.50
30.0
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
14.31
66.67
66.67
66.67
66.65
66.67
66.67
66.67
66.65
67.20
62.00
69.00
60.00
66.67
60.00
60.00
60.00
50.00
50.00
55.56
49.99
50.00
50.00
50.00
49.99
56.00
46.50
51.75
50.00
50.00
50.00
50.00
48.00
100.00
100.00
133.30
112.00
124.00
138.00
150.00
66.67
133.33
99.98
112.00
124.00
138.00
150.00
133.34
150.00
100.00
120.00
Dial-A-dB™ Feature
48 Pin SSOP package
33.34
30.00
30.00
30.00
100.00
150.00
160.00
Block Diagram
30pF
Xin
VDD
VDD
Table 1
* Can also be programmed via SMBus interface.
300K
1
3
AGP_SEL/REF1
SEL3/REF0
30pF
Xout
1
VDD
AGP_SEL/REF1
SEL3/REF0
VSS
VDDC
CPU0
CPU1
CPU2
VSS
1
2
3
4
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDC
VDD
Rin
CPU(0:2)
AGP (0,1)
cpu
agp
pm_sel
agp_sel
2
VDDS
sdram
9
SDRAM(0:7, 12)
PD#/SDRAM8
s3
s2
s1
s0
XIN
5
sdram
pd#
1
XOUT
VDDS
6
VDDP
SDRAM0
SDRAM1
SDRAM2
VSS
SDRAM3
SDRAM4
SDRAM5
VDDS
SDRAM6
SDRAM7
VSS
PD#/SDRAM8
SDR_STP#/SDRAM9
VSS
7
8
9
sdram
sdr_stp#
sdram
1
1
1
SDR_STP#/SDRAM9
SDATA
SCLK
sdata
sclk
SEL1/PCI_F
SEL2/PCI1
PCI2
PCI_STP#/SDRAM10
CPU_STP#/SDRAM11
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
pci_stp#
PCI3
PCI4
PCI5
VSS
VDD
AGP0
AGP1
VSS
sdram
cpu_stp#
VDDP
pci
4
PCI(2:5)
PLL1
VDDP
VDDP
SEL1/PCI_F
1
VSS
SEL2/PCI1
1
SEL0/48M
PM_SEL/24M_48M
VDD48
PCI_STP#/SDRAM10
CPU_STP#/SDRAM11
SDRAM12
1
SEL0/48M
Rin
48
SDATA
SCLK
VDD
VDD
i2c-clk
i2c-data
VDDS
PLL2
1
PM_SEL/24M_48M
24 or 48
Pin Configuration
Cypress Semiconductor Corporation
525 Los Coches St.
Document#: 38-07036 Rev. **
05/02/2001
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
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