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CY28409ZC

Description
Clock Synthesizer with Differential SRC and CPU Outputs
File Size343KB,17 Pages
ManufacturerCypress Semiconductor
Download Datasheet View All

CY28409ZC Overview

Clock Synthesizer with Differential SRC and CPU Outputs

CY28409
Clock Synthesizer with Differential SRC and
CPU Outputs
Features
• Supports Intel
®
Pentium
®
4-type CPUs
• Selectable CPU frequencies
• 3.3V power supply
• Ten copies of PCI clocks
• Five copies of 3V66 with one optional VCH
• Two copies 48-MHz USB clocks
CPU
x3
SRC
x1
3V66
x5
PCI
x 10
REF
x2
48M
x2
• Three differential CPU clock pairs
• One differential SRC clock
• I
2
C support with readback capabilities
• Ideal Lexmark Spread Spectrum profile for maximum
EMI reduction
• 56-pin SSOP and TSSOP packages
Block Diagram
XIN
XOUT
CPU_STP#
PCI_STP#
FS_[A:B]
VTT_PWRGD#
IREF
VDD_3V66
3V66_[0:3]
Pin Configuration
VDD_REF
REF0:1
[1]
XTAL
OSC
PLL1
~
PLL Ref Freq
Divider
Network
VDD_CPU
CPUT[0:2], CPUC[0:2]
VDD_SRC
SRCT, SRCC
PLL2
2
VDD_PCI
PCIF[0:2]
PCI[0:6]
3V66_4/VCH
VDD_48MHz
DOT_48
USB_48
PD#
SDATA
SCLK
I
2
C
Logic
REF_0
REF_1
VDD_REF
XIN
XOUT
VSS_REF
PCIF0
PCIF1
PCIF2
VDD_PCI
VSS_PCI
PCI0
PCI1
PCI2
PCI3
VDD_PCI
VSS_PCI
PCI4
PCI5
PCI6
PD#
3V66_0
3V66_1
VDD_3V66
VSS_3V66
3V66_2
3V66_3
SCLK
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
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
FS_B
VDD_A
VSS_A
VSS_IREF
IREF
FS_A
CPU_STP#
PCI_STP#
VDD_CPU
CPUT2
CPUC2
VSS_CPU
CPUT1
CPUC1
VDD_CPU
CPUT0
CPUC0
VSS_SRC
SRCT
SRCC
VDD_SRC
VTT_PWRGD#
VDD_48
VSS_48
DOT_48
USB_48
SDATA
3V66_4/VCH
56 SSOP/TSSOP
CY28409
Note:
1. Signals marked with [*] and [**] have internal pull-up and pull-down resistors, respectively.
Cypress Semiconductor Corporation
Document #: 38-07445 Rev. *D
198 Champion Court
San Jose
,
CA 95134-1709
408-943-2600
Revised January 2, 2006
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