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440BX AGPset Spread Spectrum Frequency Synthesizer
CYW150
........................ Document #: 38-07177 Rev. *B Page 1 of 14
400 West Cesar Chavez, Austin, TX 78701
1+(512) 416-8500
1+(512) 416-9669
www.silabs.com
Features
Maximized electromagnetic interference (EMI)
suppression using Cypress’s Spread Spectrum
technology
Single-chip system frequency synthesizer for Intel
440BX AGPset
Three copies of CPU output
Seven copies of PCI output
One 48 MHz output for USB/one 24 MHz for SIO
Two buffered reference outputs
Two IOAPIC outputs
17 SDRAM outputs provide support for four DIMMs
Supports frequencies up to 150 MHz
SMBus interface for programming
Power management control inputs
Key Specifications
CPU Cycle-to-Cycle Jitter: .......................................... 250 ps
CPU to CPU Output Skew: ......................................... 175 ps
PCI to PCI Output Skew:............................................. 500 ps
SDRAMIN to SDRAM0:15 Delay:.......................... 3.7 ns typ.
VDDQ3:..................................................................... 3.3V±5%
VDDQ2:..................................................................... 2.5V±5%
SDRAM0:15 (leads) to SDRAM_F Skew: ............. 0.4 ns typ.
Table 1. Mode Input Table
Mode
Pin 3
0PCI_STOP#
1REF0
Table 2. Pin Selectable Frequency
Input Address
CPU_F, 1:2
(MHz)
PCI_F, 0:5
(MHz)
FS3
FS2
FS1
FS0
1
133.3
33.3 (CPU/4)
1
0
124
31 (CPU/4)
1
0
1
150
37.5 (CPU/4)
1
0
140
35 (CPU/4)
1
0
1
105
35 (CPU/3)
1
0
1
0
110
36.7 (CPU/3)
1
0
1
115
38.3 (CPU/3)
1
0
120
40 (CPU/3)
0
1
100
33.3 (CPU/3)
0
1
0
133.3
44.43 (CPU/3)
0
1
0
1
112
37.3 (CPU/3)
0
1
0
103
34.3 (CPU/3)
0
1
66.8
33.4 (CPU/2)
0
1
0
83.3
41.7 (CPU/2)
0
1
75
37.5 (CPU/2)
0
124
41.3 (CPU/3)
Logic Block Diagram
Pin Configuration[1]
VDDQ3
REF0/(PCI_STOP#)
VDDQ2
IOAPIC_F
CPU_F
CPU1
CPU2
PCI_F/MODE
XTAL
PLL Ref Freq
PLL 1
X2
X1
REF1/FS2
VDDQ3
Stop
Clock
Control
Stop
Clock
Control
PCI1
PCI2
PCI3
PCI5
48MHz/FS1
24MHz/FS0
PLL2
÷2,3,4
OSC
VDDQ2
CLK_STOP#
VDDQ3
IOAPIC0
PCI4
SMBus
SDATA
Logic
SCLK
I/O Pin
Control
SDRAM0:15
SDRAMIN
16
VDDQ3
PCI0/FS3
Stop
Clock
Control
Stop
Clock
Control
SDRAM_F
VDDQ3
REF1/FS2
REF0/(PCI_STOP#)
GND
X1
X2
VDDQ3
PCI_F/MODE
PCI0/FS3
GND
PCI1
PCI2
PCI3
PCI4
VDDQ3
PCI5
SDRAMIN
SDRAM11
SDRAM10
VDDQ3
SDRAM9
SDRAM8
GND
SDRAM15
CYW150
VDDQ2
IOAPIC0
IOAPIC_F
GND
CPU_F
CPU1
VDDQ2
CPU2
GND
CLK_STOP#
SDRAM_F
VDDQ3
SDRAM0
SDRAM1
GND
SDRAM2
SDRAM3
SDRAM4
SDRAM5
VDDQ3
SDRAM6
SDRAM7
GND
SDRAM12
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
32
31
30
29
SDRAM14
GND
SDATA
SCLK
SDRAM13
VDDQ3
24MHz/FS0
48MHz/FS1
Note:
1. 1.Internal pull-up resistors should not be relied upon for setting I/O pins HIGH. Pin function
with parentheses determined by MODE pin resistor strapping. Unlike other I/O pins, input
FS3 has an internal pull-down resistor.
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