ICS9248-138 Datasheet, PDF (1/12 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9248-138
Preliminary Product Preview
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
810/810E and Solano type chipset.
Output Features:
• 2- CPUs @ 2.5V
• 9 - SDRAM @ 3.3V, including 1 free running
• 7 - PCICLK @ 3.3V
• 1 - IOAPIC @ 2.5V,
• 3 - 3V66MHz @ 3.3V
• 2 - 48MHz, @ 3.3V fixed.
• 1 - 24/48MHz, @3.3V selectable by I²C
• 1 - REF @v3.3V, 14.318MHz.
Features:
• Up to 200MHz frequency support
• Support FS0-FS4 strapping status bit for I²C read back.
• Support power management: Through Power down
Mode from I²C programming.
• Spread spectrum for EMI control ( ± 0.25% center).
• 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.
Pin Configuration
1_{*SEL24_48#/REF0}
1
VDDREF
2
X1
3
X2
4
GNDREF
5
GND3V66
6
3V66-0
7
3V66-1
8
3V66-2
9
VDD3V66
10
VDDPCI
11
1_*FS0/PCICLK0
12
1_{**FS1/PCICLK1}
13
GNDPCI
14
PCICLK2
15
PCICLK3
16
PCICLK4
17
VDDPCI
18
PCICLK5
19
PCICLK6
20
GNDPCI
21
PD#
22
SCLK
23
SDATA
24
48
VDDLAPIC
47
IOAPIC¹
46
VDDLCPU
45
CPUCLK0
44
CPUCLK1
43
GNDLCPU
42
GNDSDR
41
SDRAM0
40
SDRAM1
39
SDRAM2
38
VDDSDR
37
SDRAM3
36
SDRAM4
35
SDRAM5
34
GNDSDR
33
SDRAM6
32
SDRAM7
31
SDRAM_F
30
VDDSDR
29
GND48
28
24_48MHz/FS2**
27
48MHz/FS3*
26
48MHz/FS4*¹
25
VDD48
48-Pin 300mil SSOP
* These inputs have a 120K pull up to VDD.
* * These inputs have a 120K pull down to GND.
1 These are double strength.
Block Diagram
PLL2
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
SEL24_48#
SDATA
SCLK
FS[4:0]
PD#
Control
Logic
Config.
Reg.
/2
CPU
DIVDER
SDRAM
DIVDER
IOAPIC
DIVDER
PCI
DIVDER
3V66
DIVDER
48MHz [1:0]
2
24_48MHz
REF0
CPUCLK [1:0]
2
SDRAM [7:0]
8
SDRAM_F
IOAPIC
PCICLK [6:0]
7
3V66 [2:0]
3
9248- 138 Rev A 10/03/00
Third party brands and names are the property of their respective owners.
Functionality
FS4 FS3 FS2 FS1 FS0
0000 0
0000 1
00010
0001 1
0 0 10 0
0 0 10 1
00 110
00 11 1
0 100 0
0 100 1
0 10 1 0
0 10 1 1
0 1 10 0
0 1 10 1
0 1110
0 111 1
CPU
(MHz)
66.67
66.87
68.67
71.34
100.00
100.30
103.00
107.00
133.33
133.73
137.33
120.00
133.33
133.73
137.33
120.00
SDRAM
(MHz)
100.00
100.30
103.00
107.00
100.00
100.30
103.00
107.00
133.33
133.73
137.33
120.00
100.00
100.30
103.00
90.00
3V66
(MHz)
66.67
66.87
68.67
71.34
66.67
66.87
68.67
71.34
66.67
66.87
68.67
60.00
66.67
66.87
68.67
60.00
PCICLK
(MHz)
33.33
33.43
34.33
35.66
33.33
33.43
34.33
35.66
33.33
33.43
34.33
30.00
33.33
33.43
34.33
30.00
IOAPIC
(MHz)
16.67
16.72
17.16
17.83
16.67
16.72
17.17
17.84
16.67
16.72
17.17
15.00
16.67
16.72
17.17
15.00
1 1 0 1 0 160.00 160.00 80.00
1 1 1 0 1 160.00 120.00 80.00
1 1 0 1 1 166.67 166.67 83.34
1 1 1 1 0 166.67 125.00 83.34
40.00
40.00
41.67
41.67
20.00
20.00
20.84
20.84
Additional frequencies selectable through I²C programming.
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.