Integrated
Circuit
Systems, Incꢀ
ICS9248-131
Frequency Generator & Integrated Buffers for Celeron & PII/III™
RecommendedApplication:
ALI -Aladdin V - mobile style chipsets
Pin Configuration
OutputFeatures:
VDDF
*REF0/CPU2.5_3.3#
GND
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
VDDAGP
AGP0
AGP1
3-CPUs@2ꢀ5/3ꢀ3V, upto100MHzꢀ
3-AGPCLK@3ꢀ3V
13-SDRAM@3ꢀ3V
6-PCI@3ꢀ3V
1-48MHz,@3ꢀ3Vfixedꢀ
1-REF@3ꢀ3V,14ꢀ318MHzꢀ
X1
X2
VDDPCI
GND
CPUCLK0
CPUCLK1
VDDL
CPUCLK2
SDRAM12
GND
SDRAM0
SDRAM1
VDDSDR
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDDSDR
SDRAM6
SDRAM7
GND
*PCICLK_F/FS1
*PCICLK0/FS2
GND
PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDDA
BUFFERIN
GND
Features:
Support power management: CPU, PCI, AGP stop and
Power down Mode from I2C programmingꢀ
Spread spectrum for EMI controlꢀ
Uses external 14ꢀ318MHz crystal
FS pins for frequency select
*CPU_STOP#/SDRAM11
*PCI_STOP#/SDRAM10
VDDSDR
*AGP_STOP#/SDRAM9
*PD#/SDRAM8
GND
KeySpecifications:
CPUCPU:<250ps
AGPPCI:<550ps
CPU(early)-PCI:1-4ns, Center2-6ns
SDATA
SCLK
48MHz/FS0*
AGP_F/MODE*
48-Pin SSOP
* Internal Pull-up Resistor of
240K to 3ꢀ3V on indicated inputs
Block Diagram
Functionality
PLL2
48MHz
CPU, SDRAM
PCI
(MHz)
AGP
(MHz)
FS2 FS1 FS0
(MHz)
X1
X2
XTAL
OSC
REF
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
100
95.25
83.3
97
33.33
31.75
33.30
32.33
30.50
32.07
33.33
30.00
66.67
63.50
66.60
64.66
61.00
64.15
66.67
60.00
PLL1
Spread
Spectrum
CPU
DIVDER
Stop
Stop
CPUCLK (2:0)
3
5
91.5
96.22
66.67
60
PCI
DIVDER
PCICLK (4:0)
PCICLK_F
CPU2.5_3.3#
Control
Logic
SDATA
SCLK
FS (2:0)
Note:REF&IOAPIC=14ꢀ318MHz
AGP
DIVDER
Stop
AGP (1:0)
AGP_F
PD#
PCI_STOP#
CPU_STOP#
SDRAM_STOP#
AGP-STOP#
MODE
2
Config.
Reg.
Power Groups
Analog
Digital
VDDF
VDDA
VDDPCI
VDDSDR
VDDAGP
SDRAM (12:0)
BUFFERIN
13
Pentium is a trademark of Intel Corporation
I2C is a trademark of Philips Corporation
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
9248-131RevB7/17/00
information being relied upon by the customer is current and accurate.