CY28409 Datasheet, PDF (1/18 Pages) Cypress Semiconductor – 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
• Three differential CPU clock pairs
• One differential SRC clock
• I²C support with readback capabilities
• Ideal Lexmark Spread Spectrum profile for maximum
EMI reduction
• 56-pin SSOP and TSSOP packages
CPU
SRC
3V66
PCI
REF
48M
x3
x1
x5
x 10
x2
x2
Block Diagram
XIN
XOUT
CPU_STP#
PCI_STP#
FS_[A:B]
VTT_PWRGD#
IREF
XTAL
OSC
PLL Ref Freq
PLL1
Divider
Network
PLL2
2
PD#
SDATA
SCLK
I²C
Logic
Pin Configuration^[1]
VDD_REF
REF0:1
VDD_CPU
CPUT[0:2], CPUC[0:2]
VDD_SRC
SRCT, SRCC
VDD_3V66
3V66_[0:3]
VDD_PCI
PCIF[0:2]
PCI[0:6]
3V66_4/VCH
VDD_48MHz
DOT_48
USB_48
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
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
56 SSOP/TSSOP
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
Note:
1. Signals marked with [*] and [**] have internal pull-up and pull-down resistors, respectively.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07445 Rev. *B
Revised August 26, 2003