Integrated
Circuit
Systems, Inc.
ICS9248-131
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
ALI - Aladdin V
- mobile style chipsets
Output Features:
3 - CPUs @ 2.5/3.3V, up to 100MHz.
3 - AGPCLK @ 3.3V
13 - SDRAM @ 3.3V
6 - PCI @ 3.3V
1 - 48MHz, @ 3.3V fixed.
1 - REF @ 3.3V, 14.318MHz.
Features:
Support power management: CPU, PCI, AGP stop and
Power down Mode from I
2
C programming.
Spread spectrum for EMI control.
Uses external 14.318MHz crystal
FS pins for frequency select
Key Specifications:
CPU CPU: <250ps
AGP PCI: <550ps
CPU(early)-PCI: 1-4ns, Center 2-6ns
Pin Configuration
VDDF
*REF0/CPU2.5_3.3#
GND
X1
X2
VDDPCI
*PCICLK_F/FS1
*PCICLK0/FS2
GND
PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDDA
BUFFERIN
GND
*CPU_STOP#/SDRAM11
*PCI_STOP#/SDRAM10
VDDSDR
*AGP_STOP#/SDRAM9
*PD#/SDRAM8
GND
SDATA
SCLK
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
GND
CPUCLK0
CPUCLK1
VDDL
CPUCLK2
SDRAM12
GND
SDRAM0
SDRAM1
VDDSDR
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDDSDR
SDRAM6
SDRAM7
GND
48MHz/FS0*
AGP_F/MODE*
48-Pin SSOP
Block Diagram
PLL2
48MHz
* Internal Pull-up Resistor of
240K to 3.3V on indicated inputs
Functionality
FS2
FS1
1
1
0
0
1
1
0
0
FS0
1
0
1
0
1
0
1
0
CPU, SDRA M
(MHz)
100
95.25
83.3
97
91.5
96.22
66.67
60
PCI
(MHz)
33.33
31.75
33.30
32.33
30.50
32.07
33.33
30.00
AGP
(MHz)
66.67
63.50
66.60
64.66
61.00
64.15
66.67
60.00
1
1
1
1
0
0
0
0
X1
X2
XTAL
OSC
PLL1
Spread
Spectrum
REF
CPU
DIVDER
Stop
3
CPUCLK (2:0)
CPU2.5_3.3#
SDATA
SCLK
FS (2:0)
PD#
PCI_STOP#
CPU_STOP#
SDRAM_STOP#
AGP-STOP#
MODE
BUFFERIN
Control
Logic
PCI
DIVDER
Stop
5
PCICLK (4:0)
PCICLK_F
AGP
DIVDER
Stop
2
AGP (1:0)
AGP_F
Note: REF & IOAPIC = 14.318MHz
Config.
Reg.
Power Groups
Analog
13
Digital
VDDPCI
VDDSDR
VDDAGP
Pentium is a trademark of Intel Corporation
I
2
C is a trademark of Philips Corporation
SDRAM (12:0)
VDDF
VDDA
9248-131 Rev B 7/17/00
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
information being relied upon by the customer is current and accurate.
ICS9248-131
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
