ICS9248-99 Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9248-99
Preliminary Product Preview
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
810/810E style chipset
Output Features:
• 2- CPUs @2.5V @ 150MHz (up to 200MHz. achievable
through I²C)
• 9 - SDRAM @ 3.3V @ 150MHz (up to 200MHz.
achievable through I²C)
• 8 - PCICLK @ 3.3V
• 1 - IOAPIC @ 2.5V,
• 2 - 3V66MHz @ 3.3V
• 2- 48MHz, @ 3.3V fixed.
• 1- 24/48MHz, @ 3.3V
• 1- REF @3.3V, 14.318MHz.
Features:
• Up to 200.4MHz frequency support
• Support FS0-FS3 trapping status bit for I²C read back.
• Support power management: Power down Mode form I²C
programming.
• Spread spectrum for EMI control ( ± 0.25% center).
• FS0, FS1, FS2, FS3 must have a internal 120K pull-Down
to GND.
• Uses external 14.318MHz crystal
Skew Specifications:
• CPU – CPU: <175ps
• SDRAM - SDRAM: < 250ps
• 3V66 – 3V66: <175ps
• PCI – PCI: <500ps
• For group skew specifications, please refer to group
timing relationship table.
Pin Configuration
48-Pin 300mil SSOP
* These inputs have a 120K pull down to GND.
1 These are double strength.
Block Diagram
Functionality
FS3 FS2 FS1 FS0
000 0
000 1
0010
001 1
0 10 0
0 10 1
0 110
0 11 1
100 0
100 1
10 1 0
10 1 1
1 10 0
1 10 1
1110
111 1
CPU SDRAM
(MHz) (MHz)
75.33
125.00
129.00
150.29
150.00
112.00
145.00
143.64
68.30
105.00
138.00
140.00
66.67
100.00
133.60
133.33
113.00
125.00
129.00
113.00
150.00
112.00
145.00
108.00
102.50
105.00
138.00
105.00
100.00
100.00
133.60
100.00
3V66
(MHz)
75.33
83.33
86.00
75.33
100.00
74.67
96.67
72.00
68.33
70.00
92.00
70.00
66.67
66.67
89.07
66.67
PCICLK
(3V66*
1/2)
(MHz)
37.67
41.67
43.00
37.67
50.00
37.33
48.33
36.00
34.17
35.00
46.00
35.00
33.33
33.33
44.53
33.33
IOAPIC
(PCI*
1/2)
(MHz)
IOAPIC
(PCI)
(MHz)
18.83 37.67
20.83 41.67
21.50 43.00
18.83 37.67
25.00 50.00
18.67 37.33
24.17 48.33
18.00 36.00
17.08 34.17
17.50 35.00
23.00 46.00
17.50 35.00
16.67 33.33
16.67 33.33
22.27 44.53
16.67 33.33
9248- 99 Rev A 8/27/99
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.