CY28404 Datasheet, PDF (1/20 Pages) Cypress Semiconductor – CK409-COMPLIANT CLOCK SYNTHESIZER

CY28404
CK409-Compliant Clock Synthesizer
Features
• Supports Intel^ Springdale/Prescott (CK409)
• Selectable CPU frequencies
• 3.3V power supply
• Nine copies of PCI clock
• Four copies 3V66 clock with optional VCH
• Three copies 48-MHz clock
• Three copies REF clock
• Two differential CPU clock pairs
• Support SMBus/I²C Byte, Word, and Block Read/Write
• Dial-A-Frequency^
• Ideal Lexmark Spread Spectrum profile for maximum
electromagnetic interference (EMI) reduction
• 48-pin SSOP package
Table 1. Frequency Table
CPU
3V66
PCI
REF
48M
x2
x4
x9
x3
x3
Block Diagram
XIN
XOUT
FS_(A:E)
VTT_PWRGD#
IREF
XTAL
OSC
PLL Ref Freq
PLL 1
Divider
Network
SEL24#
SELVCH
PLL2
2
MODE
PD#
SDATA
SCLK
I²C
Logic
2
WD
Timer
Pin Configuration
VDD_REF
REF(0:2)
**FS_A/REF_0
**FS_B/REF_1
VDD_CPU
CPUT(0:1), CPUC(0:1)
VDD_REF
XIN
XOUT
VSS_REF
*FS_C/PCIF0
*FS_D/PCIF1
*FS_E/PCIF2
VDD_PCI
VDD_3V66
3V66_(0:2)
VSS_PCI
PCI0
PCI1
VDD_PCI
PCIF(0:2)
PCI2
PCI3
VDD_PCI
PCI(0:5)
VSS_PCI
PCI4
PCI5
3V66_3/VCH
RESET#/PD#
*SEL24#/24_48MHz
DOT_48
VDD_48MHz
USB_48
DOT_48
VSS_48
USB_48
24_48MHz
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12
37
13
36
14
35
15
34
16
33
17
32
18
31
19
30
20
29
21
28
22
27
23
26
24
25
SSOP-48
REF_2
VDDA
VSSA
IREF
VSS_CPU
CPUT1
CPUC1
VDD_CPU
CPUT0
CPUC0
VSS
DNC***
DNC***
VDD
VTT_PWRGD#
SDATA*
SCLK*
3V66_0
3V66_1
VSS_3V66
VDD_3V66
3V66_2/MODE*
3V66_3/VCH/SELVCH**
VDD_48
RESET#
* 150k Internal Pull-up
** 150k Internal Pull-down
*** Do Not Connect
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07510 Rev. *B
Revised June 16, 2004