ICS9248-131 Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

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 I²C 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
1
*REF0/CPU2.5_3.3#
2
GND
3
X1
4
X2
5
VDDPCI
6
*PCICLK_F/FS1
7
*PCICLK0/FS2
8
GND
9
PCICLK1
10
PCICLK2
11
PCICLK3
12
PCICLK4
13
VDDA
14
BUFFERIN
15
GND
16
*CPU_STOP#/SDRAM11
17
*PCI_STOP#/SDRAM10
18
VDDSDR
19
*AGP_STOP#/SDRAM9
20
*PD#/SDRAM8
21
GND
22
SDATA
23
SCLK
24
48
VDDAGP
47
AGP0
46
AGP1
45
GND
44
CPUCLK0
43
CPUCLK1
42
VDDL
41
CPUCLK2
40
SDRAM12
39
GND
38
SDRAM0
37
SDRAM1
36
VDDSDR
35
SDRAM2
34
SDRAM3
33
GND
32
SDRAM4
31
SDRAM5
30
VDDSDR
29
SDRAM6
28
SDRAM7
27
GND
26
48MHz/FS0*
25
AGP_F/MODE*
48-Pin SSOP
Block Diagram
* Internal Pull-up Resistor of
240K to 3.3V on indicated inputs
PLL2
X1
X2
CPU2.5_3.3#
SDATA
SCLK
FS (2:0)
PD#
PCI_STOP#
CPU_STOP#
SDRAM_STOP#
AGP-STOP#
MODE
BUFFERIN
XTAL
OSC
PLL1
Spread
Spectrum
Control
Logic
Config.
Reg.
CPU
DIVDER
Stop
PCI
DIVDER
Stop
AGP
DIVDER
Stop
48MHz
REF
3 ^{CPUCLK (2:0)}
5 ^{PCICLK (4:0)}
PCICLK_F
AGP (1:0)
2
AGP_F
SDRAM (12:0)
13
Functionality
FS2 FS1 FS0 ^{CPU, SDRAM}
(MHz)
111
100
110
101
95.25
83.3
100
97
011
010
91.5
96.22
001
66.67
000
60
Note: REF & IOAPIC = 14.318MHz
Power Groups
Analog
Digital
VDDF
VDDA
VDDPCI
VDDSDR
VDDAGP
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
9248-131 Rev B 7/17/00
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
information being relied upon by the customer is current and accurate.