ICS9250-08 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9250-08
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
BX, Appollo Pro 133 type of chip set.
Output Features:
• 3 - CPUs @2.5V, up to 150MHz.
• 17 - SDRAM @ 3.3V, up to 150MHz.
• 7 - PCI @3.3V
• 2 - IOAPIC @ 2.5V
• 1 - 48MHz, @3.3V fixed.
• 1 - 24MHz @ 3.3V
• 2 - REF @3.3V, 14.318MHz.
Features:
• Up to 150MHz frequency support
• Support power management: CPU, PCI, stop and Power
down Mode form I²C programming.
• Spread spectrum for EMI control (0 to -0.5%, ± 0.25%).
• Uses external 14.318MHz crystal
Key Specifications:
• CPU – CPU: <175ps
• CPU – PCI: min = 1ns max = 4ns
• PCI – PCI: <250ps
• SDRAM - SDRAM: <500ps
Block Diagram
Pin Configuration
VDDREF
1
*FS2/REF1
2
*PCI_STOP/REF0
3
GND
4
X1
5
X2
6
VDDPCI
7
*MODE/PCICLK_F
8
**FS3/PCICLK0
9
GND
10
PCICLK1
11
PCICLK2
12
PCICLK3
13
PCICLK4
14
VDDPCI
15
PCICLK5
16
BUFFERIN
17
SDRAM11
18
SDRAM10
19
VDDSDR
20
SDRAM9
21
SDRAM8
22
GND
23
SDRAM15
24
SDRAM14
25
GND
26
{ I ² C
SDATA
SCLK
27
28
56
VDDLIOAPIC
55
IOAPIC0
54
IOAPIC_F
53
GND
52
CPUCLK_F
51
CPUCLK1
50
VDDLCPU
49
CPUCLK2
48
GND
47
CPU_STOP#
46
SDRAM_F
45
VDDSDR
44
SDRAM0
43
SDRAM1
42
GND
41
SDRAM2
40
SDRAM3
39
SDRAM4
38
SDRAM5
37
VDDSDR
36
SDRAM6
35
SDRAM7
34
GND
33
SDRAM12
32
SDRAM13
31
VDD48
30
24MHz/FS0*
29
48MHz/FS1*
56-Pin SSOP
* Internal Pull-up Resistor of 240K to 3.3V on indicated inputs
** Internal Pull-down resistor of 240K to GND on indicated inputs.
PLL2
X1
XTAL
X2
OSC
÷2
STOP
FS[3:0]
MODE
CPU_STOP#
PCI_STOP#
{ I ² C
SCLK
SDATA
BUFFERIN
PLL1
Spread
Spectrum
LATCH
4
POR
Control
Logic
Config.
Reg.
STOP
PCI
CLOCK
DIVDER
STOP
STOP
48MHz
24MHz
IOAPIC_F
IOAPIC0
REF [1:0]
2
CPUCLK_F
1
CPUCLK [2:1]
2
6 ^{PCICLK [5:0]}
PCICLK_F
16 ^{SDRAM [15:0]}
SDRAM_F
Functionality
FS3 FS2 FS1 FS0
1
1
1
1
1
1
1
0
1
1
0
1
1
1
0
0
1
0
1
1
1
0
1
0
1
0
0
1
1
0
0
0
0
1
1
1
0
1
1
0
0
1
0
1
0
1
0
0
0
0
1
1
0
0
1
0
0
0
0
1
0
0
0
0
CPU
(MHz)
133
124
150
140
105
110
115
120
100.3
133
112
103
66.8
83.3
75
124
PCICLK (MHz)
33.3 (CPU/4)
31 (CPU/4)
37.5 (CPU/4)
35 (CPU/4)
35 (CPU/3)
36.67 (CPU/3)
38.33 (CPU/3)
40.00 (CPU/3)
33.43 (CPU/3)
44.33 (CPU/3)
37.33 (CPU/3)
34.33 (CPU/2)
33.40 (CPU/2)
41.65 (CPU/2)
37.5 (CPU/2)
41.33 (CPU/2)
9250-08 Rev H 10/8/99
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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.