Integrated
Circuit
Systems, Inc.
ICS9248-110
AMD-K7TM System Clock Chip
Recommended Application:
AMD-K7 based systems
Output Features:
Pin Configuration
**FS0/REF0
**FS1/REF1
GNDREF
X1
1
2
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDREF
GNDSD
SDRAM_OUT
VDDSD
•
3 differential pair open drain CPU clocks (2.7V external
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
pull-up; up to 150MHz achieviable through I2C)
X2
RESERVED
CPUCLKC2
CPUCLKT2
GNDCPU
CUCLKC1
CPUCLKT1
GND
CPUCLKC0
CPUCLKT0
RESERVED
VDD
•
•
•
•
•
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.
GNDPCI
PCICLK_F
PCICLK0
VDDPCI
PCICLK1
PCICLK2
GNDPCI
PCICLK3
PCICLK4
VDDPCI
PCICLK5
PCICLK6
VDDAGP
AGP0
AGP1
GNDAGP
VDD48
Features:
•
•
Up to 150MHz frequency support
GND
PCI_STOP#
CPU_STOP
PD#
SPREAD#
FS2*
SDATA
SCLK
GND48
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
48MHz
SEL24_48#/24-48MHz
Key Specifications:
•
•
•
•
•
CPU – CPU: <250ps
AGP-AGP: <250ps
PCI – PCI: <400ps
CPU - SDRAM_OUT: <400ps
CPU-AGP <250ps
48-Pin 300mil SSOP
* Internal 120K pullup resistor on indicated inputs
** Internal 240K pullup resistor on indicated inputs
Block Diagram
X1
REF (1:0)
OSC
X2
CPU_STOP#
Functionality
FS (2:0)
PLL
SPREAD#
CPUCLKT (2:0)
CPUCLKC (2:0)
SDRAM_OUT
CPU
STOP
CPU,
SDRAM
90
95
100.99
115
100.7
103
105
FS2
FS1
FS0
PCI
AGP
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
30.00
31.67
33.66
38.33
33.57
34.33
35.00
36.67
60.00
63.33
67.33
76.67
67.13
68.67
70.00
73.33
/ 2
/ 3
PD#
X 2
AGP (1:0)
PCI
STOP
PCICLK (6:0)
PCI_STOP#
PCICLK_F
48MHz
PLL2
110
24_48MHz
/ 2
SEL24_48#
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
9248-110 Rev C 01/08/01
Third party brands and names are the property of their respective owners.
information being relied upon by the customer is current and accurate.