ICS9248-110 Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – AMD-K7TM System Clock Chip

Integrated
Circuit
Systems, Inc.
ICS9248-110
AMD-K7^TM System Clock Chip
Recommended Application:
AMD-K7 based systems
Output Features:
• 3 differential pair open drain CPU clocks (2.7V external
pull-up; up to 150MHz achieviable through I²C)
• 2 - AGPCLK @ 3.3V
• 8 - PCI @3.3V, including 1 free running
• 1 - 48MHz @ 3.3V
• 1 - 24/48MHz @ 3.3V
• 2- REF @3.3V, 14.318MHz.
Features:
• Up to 150MHz frequency support
• Support power management: CPU, PCI, stop and Power
down Mode from I²C programming.
• Spread spectrum for EMI control -0.5% down spread
• Uses external 14.318MHz crystal
• FS pins for frequency select
Key Specifications:
• CPU – CPU: <250ps
• AGP-AGP: <250ps
• PCI – PCI: <400ps
• CPU - SDRAM_OUT: <400ps
• CPU-AGP <250ps
Pin Configuration
**FS0/REF0
1
**FS1/REF1
2
GNDREF
3
X1
4
X2
5
GNDPCI
6
PCICLK_F
7
PCICLK0
8
VDDPCI
9
PCICLK1
10
PCICLK2
11
GNDPCI
12
PCICLK3
13
PCICLK4
14
VDDPCI
15
PCICLK5
16
PCICLK6
17
VDDAGP
18
AGP0
19
AGP1
20
GNDAGP
21
VDD48
22
48MHz
23
SEL24_48#/24-48MHz
24
48
VDDREF
47
GNDSD
46
SDRAM_OUT
45
VDDSD
44
RESERVED
43
CPUCLKC2
42
CPUCLKT2
41
GNDCPU
40
CUCLKC1
39
CPUCLKT1
38
GND
37
CPUCLKC0
36
CPUCLKT0
35
RESERVED
34
VDD
33
GND
32
PCI_STOP#
31
CPU_STOP
30
PD#
29
SPREAD#
28
FS2*
27
SDATA
26
SCLK
25
GND48
48-Pin 300mil SSOP
* Internal 120K pullup resistor on indicated inputs
** Internal 240K pullup resistor on indicated inputs
Block Diagram
X1
X2
CPU_STOP#
FS (2:0)
SPREAD#
PD#
PCI_STOP#
OSC
PLL
CPU
STOP
/2
/3
X2
PCI
STOP
SEL24_48#
PLL2
/2
REF (1:0)
CPUCLKT (2:0)
CPUCLKC (2:0)
SDRAM_OUT
AGP (1:0)
PCICLK (6:0)
PCICLK_F
48MHz
24_48MHz
Functionality
FS2 FS1 FS0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
CPU,
SDRAM
90
95
100.99
115
100.7
103
105
110
PCI
30.00
31.67
33.66
38.33
33.57
34.33
35.00
36.67
AGP
60.00
63.33
67.33
76.67
67.13
68.67
70.00
73.33
9248-110 Rev C 01/08/01
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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.