CY28405OC-2 SPECTRALINEAR [SpectraLinear Inc], CY28405OC-2 Datasheet - Page 33

• Manufacturer Part Number: CY28405OC-2
• Description: Clock Synthesizer with Differential SRC and CPU Outputs
• Manufacturer: SPECTRALINEAR [SpectraLinear Inc]

Rev 1.0, November 22, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
Features
Note:
1. Signals marked with [*] and [**] have internal pull-up and pull-down resistors, respectively.
• Supports Intel Pentium
• Selectable CPU frequencies
• 3.3V power supply
• Nine copies of PCI clocks
• Four copies of 3V66 with one optional VCH
• Two copies 48-MHz clock
Block Diagram
VTT_PWRGD#
FS_(A:B)
SDATA
XOUT
SCLK
IREF
PD#
XIN
Clock Synthesizer with Differential SRC and CPU Outputs
PLL 1
PLL2
Logic
XTAL
OSC
I
2
C
Network
Divider
®
PLL Ref Freq
4-type CPUs
2
VDD_REF
REF(0:1)
VDD_CPU
VDD_SRCT
VDD_3V66
VDD_PCI
VDD_48MHz
DOT_48
USB_48
CPUT(0:1, ITP), CPUC(0:1, ITP)
SRCT, SRCC
3V66_(0:2)
PCI(0:5)
PCIF(0:2)
3V66_3/VCH
Tel:[phone]
• Three differential CPU clock pairs
• One differential SRC clock
• Support SMBus/I
• Ideal Lexmark Spread Spectrum profile for maximum
• 48-pin SSOP package
electromagnetic interference (EMI) reduction
CPU
x 3
Pin Configuration
*FS_A/REF_0
*FS_B/REF_1
Fax:[phone]
VDD_REF
VSS_REF
VDD_PCI
VDD_PCI
VSS_PCI
VSS_PCI
DOT_48
USB_48
VDD_48
VSS_48
XOUT
PCIF0
PCIF1
PCIF2
SRC
PCI0
PCI1
PCI2
PCI3
PCI4
PCI5
x 1
PD#
XIN
2
* 100k Internal Pull-up
C Byte, Word and Block Read/ Write
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
3V66
x 4
SSOP-48
[1]
www.SpectraLinear.com
PCI
x 9
CY28405-2
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
REF
x 2
VDDA
VSSA
IREF
CPUT_ITP
CPUC_ITP
VSS_CPU
CPUT1
CPUC1
VDD_CPU
CPUT0
CPUC0
VSS_SRC
SRCT
SRCC
VDD_SRC
VTT_PWRGD#
SDATA*
SCLK*
3V66_0
3V66_1
VSS_3V66
VDD_3V66
3V66_2
3V66_3/VCH
Page 1 of 16
48M
x 2