C9834
Low EMI Clock Generator for Intel 810 Chipset / Pentium
®
II and Pentium
®
III Systems
Preliminary
Product Features
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Supports Pentium II and Pentium III processors
Designed to the Intel 810 chipset specifications
Low Jitter, High Speed Host Bus Clock (155Mhz)
I²C for programmability and power management
< 175pS Skew.
2 CPU at 2.5V
1 IOAPIC at 2.5V
9 SDRAM clocks at 3.3V
2 3V66 at 3.3V, for Graphics
8 PCI clocks at 3.3V
2 48 MHz at 3.3V fixed
1 24_48 MHz at 3.3V programmable
1 Ref at 3.3V , 14.318 MHz
Wide range of selectable frequencies
Available in 48 pin SSOP (300 mills)
IMI Spread Spectrum for EMI reduction
®
®
Block Diagram
XIN
XB
UF
32pF
300K
32pF
XOUT
1
HDREF
VDD
PLL1
ioapic
1
VDDI
IOAPIC
VDDCPU
Rin
S0
S1
S2
S3
cpu
2
VDDS
CPU(0:1)
sdram
9
VDD
SDRAM(_F,0:7)
agp
2
VDD
3v66(0:1)
pci
I2CPMU
PD#
SCLK
SDATA
PD#
C
D
5
VDD
1
PCI(3:7)
PCI0
VDD
1
PCI1
Frequency Table MHz
S(4:0)
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
VDD
CPU
83.33
90.00
75.33
150.00
150.00
166.67
180.00
190.00
200.00
114.00
110.00
125.00
66.80
100.20
133.60
133.60
125.00
127.00
127.00
72.00
140.00
140.00
145.00
129.00
121.00
117.00
112.00
107.00
190.00
166.67
180.00
SDRAM
125.00
135.00
113.00
150.00
75.00
83.33
90.00
95.00
100.00
114.00
110.00
125.00
100.20
100.20
133.60
100.20
125.00
127.00
95.25
108.00
140.00
105.00
145.00
96.75
121.00
117.00
112.00
107.00
190.00
166.67
180.00
Table 1
3V66
83.33
90.00
75.33
75.00
50.00
55.56
60.00
63.33
66.67
76.00
73.33
62.50
66.80
66.80
66.80
66.80
83.33
84.67
63.50
72.00
93.33
70.00
96.67
64.50
80.67
78.00
74.67
71.33
95.00
83.33
90.00
PCI
41.67
45.00
37.67
37.50
25.00
27.78
30.00
31.67
33.33
38.00
36.67
41.67
33.40
33.40
33.40
33.40
41.67
42.33
31.75
36.00
46.67
35.00
48.33
32.25
40.33
39.00
37.33
35.67
47.50
41.67
45.00
IOAPIC
20.83
22.50
18.83
18.75
12.50
13.89
15.00
15.83
16.67
19.00
18.33
20.83
16.70
16.70
16.70
16.70
20.83
21.17
15.88
18.00
23.33
17.50
24.17
16.13
20.17
19.50
18.67
17.83
23.75
20.83
22.50
PLL2
Rin
48
1
PCI2
2
48 MHz-(0:1)
VDD
SIO
24_48#
1
24M / 48M
Pin Configuration
S3/HDREF
VDD
XIN
XOUT
VSS
VDD
3V66_0
3V66_1
VSS
SO/PCI0
S1/PCI1
S2/PCI2
VSS
PCI3
PCI4
VDD
PCI5
PCI6
PCI7
VSS
48MHz_0
48 MHz_1
SI0/24_48#MHz
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Fig. 2
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
VDDCPU
CPU0
CPU1
VSS
VDDS
SDRAM0
SDRAM1
SDRAM2
VSS
SDRAM3
SDRAM4
SDRAM5
VDDS
SDRAM6
SDRAM7
SDRAM_F
VSS
PD#
SCLK
VDD
VSS
SDATA
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL 408-263-6300, FAX 408-263-6571
http://www.imicorp.com
Rev. 1.1
9/7/1999
Page 1 of 15
CYPRESS [ CYPRESS SEMICONDUCTOR ]
