PRELIMINARY
CY28323
FTG for Intel
®
Pentium
®
4 CPU and Chipsets
Features
• Compatible to Intel
®
CK-Titan & CK-408 Clock Synthe-
sizer/Driver Specifications
• System frequency synthesizer for Intel Brookdale 845
and Brookdale - G Pentium
®
4 Chipsets
• Programmable clock output frequency with less than
1 MHz increment
• Integrated fail-safe Watchdog timer for system recov-
ery
• Automatically switch to HW selected or SW pro-
grammed clock frequency when watchdog timer
time-out
• Capable of generating system RESET after a Watchdog
timer time-out occurs or a change in output frequency
via SMBus interface
• Support SMBus byte read/write and block read/ write
operations to simplify system BIOS development
• Vendor ID and Revision ID support
• Programmable drive strength support
• Programmable output skew support
• Power management control inputs
• Available in 48-pin SSOP
CPU
x3
3V66
x4
PCI
x 10
REF
x2
48M
x1
24_48M
x1
Block Diagram
X1
X2
Pin Configuration
VDD_REF
REF0:1
[[1]]
XTAL
OSC
PLL 1
PLL Ref Freq
Divider
Network
VDD_CPU
CPU0:1, CPU0:1#,
CPU_ITP, CPU_ITP#
*FS0:4
VTT_PWRGD#
*MULTSEL0:1
VDD_3V66
3V66_0:3
PWR_DWN#
VDD_PCI
PCI_F0:2
PCI0:6
PLL2
VDD_48MHz
48MHz
24_48MHz
2
SDATA
SCLK
SMBus
Logic
*MULTSEL1/REF1
VDD_REF
X1
X2
GND_PCI
*FS2/PCI_F0
*FS3/PCI_F1
PCI_F2
VDD_PCI
*FS4/PCI0
PCI1
PCI2
GND_PCI
PCI3
PCI4
PCI5
PCI6
VDD_PCI
VTT_PWRGD#
RST#
GND_48MHz
*FS0/48MHz
*FS1/24_48MHz
VDD_48MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
REF0/MULTSEL0*
GND_REF
VDD_CPU
CPU_ITP
CPU_ITP#
GND_CPU
PWR_DWN#
CPU0
CPU0#
VDD_CPU
CPU1
CPU1#
GND_CPU
IREF
VDD_CORE
GND_CORE
VDD_3V66
3V66_0
3V66_1
GND_3V66
3V66_2
3V66_3
SCLK
SDATA
~
CY28323
RST#
SSOP-48
Intel and Pentium are registered trademarks of Intel Corporation
Note:
1. Signals marked with ‘*’ and “^” has internal pull-up and pull-down resistors respectively.
Cypress Semiconductor Corporation
Document #: 38-07004 Rev. *B
•
3901 North First Street
•
San Jose
•
CA 95134 • 408-943-2600
Revised December 14, 2002
CYPRESS [ CYPRESS SEMICONDUCTOR ]
