CY28349B
FTG for Intel® Pentium® 4 CPU and Chipsets
Features
• Compatible to Intel® CK-Titan and CK-408 Clock
Synthesizer/driver specifications
• Support SMBus byte read/write and block read/ write
operations to simplify system BIOS development
• System frequency synthesizer for Intel Brookdale 845
and Brookdale – G Pentium® 4 chipsets
• Vendor ID and Revision ID support
• Programmable drive strength support
• Programmable output skew support
• Power management control inputs
• Available in 48-pin SSOP
• Programmable clock output frequency with less than
1-MHz increment
• Integrated fail-safe Watchdog timer for system
recovery
• Automaticallyswitchtohardware-selectedorsoftware-
programmed clock frequency when w timer time-out
CPU
x 3
3V66
x 4
PCI
REF
x 2
48M
x 1
24_48M
x 1
x 10
• Fixed 3V66 and PCI output frequency mode.
• Capable of generating system RESET after a Watchdog
timer time-out occurs or a change in output frequency
via SMBus interface
Pin Configuration[1]
Block Diagram
VDD_REF
X1
XTAL
OSC
REF0:1
X2
PLL Ref Freq
*MULTSEL1/REF1
1
2
3
4
5
6
7
8
48
REF0/MULTSEL0*
GND_REF
VDD_CPU
CPU_ITP
CPU_ITP#
GND_CPU
PWR_DWN#
CPU0
Divider
VDD_CPU
PLL 1
Network
VDD_REF
X1
X2
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
CPU0:1, CPU0:1#,
CPU_ITP, CPU_ITP#
*FS0:4
VTT_PWRGD#
GND_PCI
*FS2/PCI_F0
*FS3/PCI_F1
PCI_F2
VDD_PCI
*FS4/PCI0
PCI1
*MULTSEL0:1
9
CPU0#
VDD_3V66
3V66_0:2
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
VDD_CPU
CPU1
CPU1#
GND_CPU
IREF
VDD_CORE
GND_CORE
VDD_3V66
3V66_0
3V66_1
GND_3V66
3V66_2
PCI2
PWR_DWN#
GND_PCI
PCI3
PCI4
VDD_PCI
PCI_F0:2
PCI0:6
VDD_48MHz
PCI5
PCI6
VDD_PCI
VTT_PWRGD#
RST#
3V66_3/48MHz_1
VDD_48MHz
48MHz_0
PLL2
GND_48MHz
*FS0/48MHz_0
*FS1/24_48MHz
VDD_48MHz
3V66_3/48MHz_1
SCLK
SDATA
24_48MHz
RST#
2
SDATA
SCLK
SMBus
Logic
SSOP-48
Note:
1. Signals marked with ‘*’ and “^” have internal pull-up and pull-down resistors, respectively.
Rev 1.0, November 20, 2006
Page 1 of 20
2200 Laurelwood Road, Santa Clara, CA 95054
Tel:(408) 855-0555 Fax:(408) 855-0550
www.SpectraLinear.com
SPECTRALINEAR [ SPECTRALINEAR INC ]
