PRELIMINARY
CY28412
Clock Generator for Intel® Grantsdale Chipset
• Low-voltage frequency select input
• I2C Support with read back capabilities
Features
• Supports Intel£ P4 and Prescott CPU
• Selectable CPU frequencies
• Differential CPU clock pairs
• 100 MHz differential SRC clocks
• 96 MHz differential dot clock
• 48 MHz USB clocks
• Ideal Lexmark Spread Spectrum profile for maximum
electromagnetic interference (EMI) reduction
• 3.3V power supply
• 56-pin SSOP package
CPU
SRC
PCI
x 8
REF
x 2
DOT96 USB_48
x2 / x3
x7 / x8
x 1
x 1
• 33 MHz PCI clock
Block Diagram
Pin Configuration
VDD_REF
REF[1:0]
PCI0
PCI1
VDD_PCI
GND_PCI
PCI2
PCI3
PCI4
PCI5
GND_PCI
VDD_PCI
1
2
3
4
5
6
7
8
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
VDD_REF
REF0/FS_C
REF1/FS_A
GND_REF
X1
X2
SDATA
SCLK
GND_CPU
CPUT0
CPUC0
VDD_CPU
CPUT1
CPUC1
IREF
XIN
XTAL
OSC
XOUT
PLL Ref Freq
VDD_CPU
CPUT[0:1], CPUC[0:1],
CPU(T/C)2_ITP]
VDD_SRC
Divider
CPU_STP#
PCI_STP#
PLL1
Network
SRCT[0:6], SRCC[0:6],
SATA[T/C]
FS_[C:A]
VTT_PWRGD#
9
IREF
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
VDD_PCI
TEST_SEL/PCIF0
ITP_EN/PCIF1
VDD_48
PCI[0:5]
VDD_PCIF
PCIF[0:1]
USB48/FS_B
GND_48
DOT96T
PD
VDD_48 MHz
GND_A
VDD_A
CPUT2_ITP/SRCT6
CPUC2_ITP/SRCC6
VDD_SRC
SRCT5
DOT96T
DOT96C
DOT96C
PLL2
VTT_PwrGd#/PD
SRCT0
SRCC0
USB_48
SRCT1
STCC1
VDD_SRC
GND_SRC
SRCT2
SRCC5
GND_SRC
SRCT4
SRCC4
SRCT3
SRCC3
VDD_SRC
SRCC2
SATAT
SATAC
2
SDATA
SCLK
I C
Logic
56 SSOP
Rev 1.0, November 20, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
Page 1 of 16
Tel:(408) 855-0555 Fax:(408) 855-0550
www.SpectraLinear.com
SPECTRALINEAR [ SPECTRALINEAR INC ]
