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ICS9248-96 Datasheet

  • ICS9248-96

  • Frequency Generator & Integrated Buffers for Celeron & PII/I...

  • 388.46KB

  • 12頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9248-96
Preliminary Product Preview
Frequency Generator & Integrated Buffers for Celeron & PII/III鈩?/div>
Recommended Application:
810/810E type chipset.
Output Features:
鈥?/div>
2- CPUs @ 2.5V, up to 155MHz.
鈥?/div>
9 - SDRAM @ 3.3V, up to 155MHz including
1 free running
鈥?/div>
8 - PCICLK @ 3.3V
鈥?/div>
1 - IOAPIC @ 2.5V,
鈥?/div>
2 - 3V66MHz @ 3.3V, 2X PCI MHz
鈥?/div>
2 - 48MHz, @ 3.3V fixed.
鈥?/div>
1 - 24/48MHz, @3.3V selectable by I
2
C
鈥?/div>
1 - REF @v3.3V, 14.318MHz.
Features:
鈥?/div>
Up to 157MHz frequency support
鈥?/div>
Support FS0-FS3 strapping status bit for I
2
C read back.
鈥?/div>
Support power management: Through Power down
Mode from I
2
C programming.
鈥?/div>
Spread spectrum for EMI control ( 鹵 0.25% center).
鈥?/div>
Uses external 14.318MHz crystal
Skew Specifications:
鈥?/div>
CPU 鈥?CPU: <175ps
鈥?/div>
SDRAM - SDRAM: < 250ps
鈥?/div>
3V66 鈥?3V66: <175ps
鈥?/div>
PCI 鈥?PCI: <500ps
鈥?/div>
CPU-SDRAM<500ps
鈥?/div>
For group skew specifications, please refer to group
timing relationship.
Pin Configuration
48-Pin 300mil SSOP
* These inputs have a 120K pull up to VDD.
** 60K pull-up to VDD on indicated input
1 These are double strength.
Block Diagram
Functionality
FS3 FS2 FS1 FS0
CPU
(MHz)
SDRAM
(MHz)
3V66
(MHz)
PCICLK
(MHz)
I OA P I C
1=PCICLK/2
I OA P I C
0=PCICLK
(MHz)
(MHz)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
66.80
68.00
100.30
103.00
133.73
145.00
133.73
137.33
140.00
140.00
118.00
124.00
133.70
137.00
150.00
72.50
100.20
102.00
100.30
103.00
100.30
108.75
100.30
103.00
105.00
140.00
118.00
124.00
133.70
137.00
112.50
108.75
66.80
68.00
66.87
68.67
66.87
72.50
66.87
68.67
70.00
93.33
78.67
82.67
89.13
91.33
75.00
72.50
33.40
34.00
33.43
34.33
33.43
36.25
33.43
34.33
35.00
46.67
39.33
41.33
44.57
45.67
37.50
36.25
16.70
17.00
16.72
17.17
16.72
18.13
16.72
17.17
17.50
23.33
19.67
20.67
22.28
22.83
18.75
18.13
33.40
34.00
33.43
34.33
33.43
36.25
33.43
34.33
35.00
46.67
39.33
41.33
44.57
45.67
37.50
36.25
Additional frequencies selectable through I
2
C programming.
9248- 96 Rev A 2/7/00
Third party brands and names are the property of their respective owners.
PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.

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