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Spread Spectrum System Frequency Synthesizer

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W158
Spread Spectrum System Frequency Synthesizer
Features
• Maximized EMI suppression using Cypress’s spread
spectrum technology
• Intel® CK98 Specification compliant
• 0.5% downspread outputs deliver up to 10 dB lower EMI
• Four skew-controlled copies of CPU output
• Eight copies of PCI output (synchronous w/CPU output)
• Four copies of 66-MHz fixed frequency 3.3V clock
• Two copies of CPU/2 outputs for synchronous memory
reference
• Three copies of 16.67-MHz IOAPIC clock, synchronous
to CPU clock
• One copy of 48-MHz USB output
• Two copies of 14.31818-MHz reference clock
• Programmable to 133- or 100-MHz operation
• Power management control pins for clock stop and shut
down
• Available in 56-pin SSOP
Key Specifications
Supply Voltages: ...................................... VDDQ3 = 3.3V±5%
VDDQ2 = 2.5V±5%
Block Diagram
X1
X2
CPU_STOP#
SPREAD#
SEL0
SEL1
SEL133/100#
XTAL
OSC
PLL 1
2
REF0:1
STOP
Clock
Logic
÷2
÷2/÷1.5
STOP
Clock
Logic
4
CPU0:3
2
CPUdiv2_0:1
4
3V66_0:3
PWRDWN#
PCI_STOP#
÷2
Power
Down
Logic
STOP
Clock
Logic
÷2
1
PCI_F
7
PCI1:7
3
IOAPIC0:2
CPU Output Jitter: ...................................................... 150 ps
CPUdiv2, IOAPIC Output Jitter: ..................................250 ps
48 MHz, 3V66, PCI Output Jitter: ................................ 500 ps
CPU0:3, CPUdiv2_ 0:1 Output Skew: ......................... 175 ps
PCI_F, PCI1:7 Output Skew: .......................................500 ps
3V66_0:3, IOAPIC0:2 Output Skew: ...........................250 ps
CPU to 3V66 Output Offset: ........... 0.0 to1.5 ns (CPU leads)
3V66 to PCI Output Offset:.......... 1.5 to 3.0 ns (3V66 leads)
CPU to IOAPIC Output Offset: ...... 1.5 to 4.0 ns (CPU leads)
CPU to PCI Output Offset: ............ 1.5 to 4.0 ns (CPU leads)
Logic inputs, except SEL133/100#, have 250-kpull-up
resistors
Table 1. Pin Selectable Frequency[1]
SEL133/100#
CPU0:3 (MHz)
PCI
1
133 MHz
33.3 MHz
0
100 MHz
33.3 MHz
Note:
1. See Table 2 for complete mode selection details.
Pin Configuration
GND
REF0
REF1
VDDQ3
X1
X2
GND
PCI_F
PCI1
VDDQ3
PCI2
PCI3
GND
PCI4
PCI5
VDDQ3
PCI6
PCI7
GND
GND
3V66_0
3V66_1
VDDQ3
GND
3V66_2
3V66_3
VDDQ3
SEL133/100#
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
56 VDDQ2
55 IOAPIC2
54 IOAPIC1
53 IOAPIC0
52 GND
51 VDDQ2
50 CPUdiv2_1
49 CPUdiv2_0
48 GND
47 VDDQ2
46 CPU3
45 CPU2
44 GND
43 VDDQ2
42 CPU1
41 CPU0
40 GND
39 VDDQ3
38 GND
37 PCI_STOP#
36 CPU_STOP#
35 PWRDWN#
34 SPREAD#
33 SEL1
32 SEL0
31 VDDQ3
30 48MHz
29 GND
Three-state
Logic
PLL2
Intel is a registered trademark of Intel Corporation.
1
48MHz
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
October 12, 1999, rev. **
Cypress Semiconductor
Cypress Semiconductor



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