CY28378 Datasheet, PDF (1/22 Pages) Cypress Semiconductor – FTG for Pentium 4 and Intel 845 Series Chipset

CY28378
FTG for Pentium 4^® and Intel^® 845 Series Chipset
Features
• Compatible with Intel^® CK-Titan and CK-408 Clock
Synthesizer/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
recovery
• Automatically switch to HW selected or SW
programmed clock frequency when Watchdog timer
time-out
• Programmable 3V66 and PCI output frequency mode
• Capable of generating system RESET after a Watchdog
timer time-out or a change in output frequency via
SMBus interface occurs
• 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
Table 1. Frequency Table
CPU
3V66
PCI
REF
48M
24_48M
x3
x4
x 10
x2
x1
x1
Block Diagram
X1
X2
*FS0:4
VTT_PWRGD#
*MULTSEL0:1
XTAL
OSC
PLL Ref Freq
PLL 1
Divider
Network
PLL2
Fract.
Aligner
2
PWRDWN#
2
SDATA
SCLK
SMBus
Logic
Pin Configuration^[1]
VDD_REF
REF0:1
VDD_CPU
*MULTSEL1/REF1
CPUT[0:1], CPUC[0:1],
CPU_ITP, CPU_ITP#
VDD_REF
X1
X2
GND_PCI
*FS2/PCI_F0
*FS3/PCI_F1
VDD_3V66
PCI_F2
3V66_0:2
VDD_PCI
VDD_PCI
PCI_F0:2
*FS4/PCI0
PCI1
PCI2
PCI0:6
GND_PCI
PCI3
VDD_48MHz
PCI4
3V66_3/48MHz_1
PCI5
VDD_48MHz
48MHz_0
PCI6
VDD_PCI
VTT_PWRGD#
RESET#
24_48MHz
GND_48MHz
*FS0/48MHz_0
*FS1/24_48MHz
VDD_48MHz
RESET#
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12
37
13
36
14
35
15
34
16
33
17
32
18
31
19
30
20
29
21
28
22
27
23
26
24
25
SSOP-48
REF0/MULTSEL0**
GND_REF
VDD_CPU
CPU_ITP
CPU_ITP#
GND_CPU
PWRDWN#*
CPUT0
CPUC0
VDD_CPU
CPUT1
CPUC1
GNDC_CPU
IREF
VDD_CORE
GND_CORE
VDD_3V66
3V66_0
3V66_1
GND_3V66
3V66_2
3V66_3/48MHz_1
SCLK
SDATA
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 #: 38-07519 Rev. **
Revised February 28,2003