PRELIMINARY
133-MHz Spread Spectrum Clock Synthesizer with
Differential CPU Outputs
CY28322-2
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-07145 Rev. *B
Revised December 14, 2002
Features
Benefits
• Compliant with Intel CK-Titan and CK-408 clock
synthesizer/driver specifications
Supports next generation Pentium processors using
differential clock drivers
• Multiple output clocks at different frequencies
— Two pairs of differential CPU outputs, up to 200 MHz
— Nine synchronous PCI clocks, three free-running
— Six 3V66 clocks
— Two 48-MHz clocks
— One reference clock at 14.318 MHz
— One VCH clock
Motherboard clock generator
— Support multiple CPUs and a chipset
— Support for PCI slots and chipset
— Supports AGP, DRCG reference, and Hub Link
— Supports USB host and graphic controllers
— Supports ISA slots and I/O chip
• Spread Spectrum clocking (down spread)
Enables reduction of EMI and overall system cost
• Power-down features (PCI_STOP#, CPU_STOP#
PWR_DWN#)
Enables ACPI-compliant designs
• Two select inputs (Mode select & IC Frequency Select) Supports up to four CPU clock frequencies
• 48-pin TSSOP package
Widely available, standard package enables lower cost
Logic Block Diagram
TSSOP
Top View
1
2
3
4
5
6
7
8
9
10
11
12
25
28
27
XTAL_IN
26
13
14
15
16
17
18
19
20
21
22
23
24
37
36
35
34
33
29
30
31
32
40
39
38
XTAL_OUT
GND_REF
PCI_F0
41
44
43
42
45
48
47
46
PCI2
66BUFF0/3V66_2
GND_CORE
SCLK
GND_48 MHz
CPU2
CPU_STOP#
GND_PCI
VDD_3V66
66IN/3V66_5
3V66_0
USB
CPU#1
VDD_REF
PCI_F1
PCI_F2
PCI0
PCI1
VDD_PCI
PCI3
PCI4
PCI5
GND_3V66
66BUFF1/3V66_3
66BUFF2/3V66_4
PWR_DWN#
VDD_CORE
PWR_GD#
SDATA
GND_3V66
VDD_3V66
PCI_STOP#
3V66_1/VCH
VDD_48 MHz
DOT
S2
IREF
CPU#2
VDD_CPU
GND_CPU
CPU1
VDD_CPU
S1
REF0
VDD_REF
CPU1:2
CPU#1:2
PCI_F0:2
XTAL
PLL Ref Freq
X2
X1
REF
VDD_PCI
USB (48MHz)
VCH_CLK/ 3V66_1
OSC
VDD_CPU
CPU_STOP#
SCLK
PCI0:5
PCI_STOP#
Stop
Clock
Control
Stop
Clock
Control
PLL 1
SMBus
Logic
DOT (48MHz)
PWR_DWN#
S1:2
VDD_48MHz
SDATA
VDD_3V66
3V66_0:1
3V66_2:4/
Divider
Network
3V66_5/ 66IN
PWR
PWR
PWR
PWR
PWR
PLL 2
PWR
66BUFF0:2
Gate
PWR_GD#
Pin Configurations
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