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ICS9248-110 Datasheet

  • ICS9248-110

  • AMD-K7TM System Clock Chip

  • 14頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9248-110
AMD-K7
TM
System Clock Chip
Recommended Application:
AMD-K7 based systems
Output Features:
鈥?/div>
3 differential pair open drain CPU clocks (2.7V external
pull-up; up to 150MHz achieviable through I
2
C)
鈥?/div>
2 - AGPCLK @ 3.3V
鈥?/div>
8 - PCI @3.3V, including 1 free running
鈥?/div>
1 - 48MHz @ 3.3V
鈥?/div>
1 - 24/48MHz @ 3.3V
鈥?/div>
2- REF @3.3V, 14.318MHz.
Features:
鈥?/div>
Up to 150MHz frequency support
鈥?/div>
Support power management: CPU, PCI, stop and Power
down Mode from I
2
C programming.
鈥?/div>
Spread spectrum for EMI control -0.5% down spread
鈥?/div>
Uses external 14.318MHz crystal
鈥?/div>
FS pins for frequency select
Key Specifications:
鈥?/div>
CPU 鈥?CPU: <250ps
鈥?/div>
AGP-AGP: <250ps
鈥?/div>
PCI 鈥?PCI: <400ps
鈥?/div>
CPU - SDRAM_OUT: <400ps
鈥?/div>
CPU-AGP <250ps
Pin Configuration
**FS0/REF0
**FS1/REF1
GNDREF
X1
X2
GNDPCI
PCICLK_F
PCICLK0
VDDPCI
PCICLK1
PCICLK2
GNDPCI
PCICLK3
PCICLK4
VDDPCI
PCICLK5
PCICLK6
VDDAGP
AGP0
AGP1
GNDAGP
VDD48
48MHz
SEL24_48#/24-48MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
RESERVED
CPUCLKC2
CPUCLKT2
GNDCPU
CUCLKC1
CPUCLKT1
GND
CPUCLKC0
CPUCLKT0
RESERVED
VDD
GND
PCI_STOP#
CPU_STOP
PD#
SPREAD#
FS2*
SDATA
SCLK
GND48
48-Pin 300mil SSOP
* Internal 120K pullup resistor on indicated inputs
** Internal 240K pullup resistor on indicated inputs
Block Diagram
X1
X2
OSC
REF (1:0)
CPU_STOP#
Functionality
FS (2:0)
SPREAD#
PLL
CPU
STOP
CPUCLKT (2:0)
CPUCLKC (2:0)
SDRAM_OUT
FS2
0
0
0
0
1
1
1
1
FS1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
/2
PD#
/3
X2
PCI
STOP
AGP (1:0)
PCICLK (6:0)
PCI_STOP#
PCICLK_F
PLL2
/2
SEL24_48#
48MHz
24_48MHz
CPU,
SDRAM
90
95
100.99
115
100.7
103
105
110
ICS9248-110
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
Third party brands and names are the property of their respective owners.
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.

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