Integrated
Circuit
Systems, Inc.
ICS9248-114
AMD - K7™ System Clock Chip
Recommended Application:
VIA K7 style chipset
Output Features:
Pin Configuration
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDD1
REF0/CPU_STOP#*
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
REF1/FS2*
GND
CPUCLKT1
•
•
•
•
•
•
•
1 - Differential pair open drain CPU clocks
1 - Single-ended open drain CPU clock
13 - SDRAM @ 3.3V
6 - PCI @3.3V,
1 - 48MHz, @3.3V fixed.
X1
X2
VDD2
GND
CPUCLKC0
CPUCLKT0
VDDL
PD#*
SDRAM_OUT
GND
SDRAM0
SDRAM1
VDD3
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDD3
SDRAM6
SDRAM7
VDD4
*MODE/PCICLK_F
*FS3/PCICLK0
GND
1 - 24/48MHz @ 3.3V
2 - REF @3.3V, 14.318MHz.
*SEL24_48#/PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDD2
Features:
•
•
Up to 155MHz frequency support
BUFFER IN
Support power management: CPU stop and Power down
Mode from I2C programming.
GND
SDRAM11
SDRAM10
VDD3
SDRAM9
SDRAM8
GND
•
Spread spectrum for EMI control (0 to -0.5% down
spread, 0.25% center spreadꢀ.
•
Uses external 14.318MHz crystal
Skew Specifications:
SDATA
SCLK
48MHz/FS0*
24/48MHz/FS1*
•
•
•
CPUT – CPUC: <200ps
PCI – PCI: <500ps
CPU – PCI: <500ps
48-Pin 300mil SSOP
*
Internal Pull-up Resistor of 120K to VDD
Functionality
Block Diagram
CPU
PCICLK
(MHz)
41.33
37.50
41.65
33.40
34.33
37.33
44.43
33.33
40.00
38.33
36.67
35.00
35.00
37.50
31.00
33.33
PLL2
48MHz
FS3
FS2
FS1
FS0
(MHz)
124.00
75.00
83.30
66.80
103.00
112.00
133.30
100.00
120.00
115.00
110.00
105.00
140.00
150.00
124.00
133.30
24_48MHz
/ 2
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X1
X2
XTAL
OSC
REF (1:0)
PLL1
Spread
Spectrum
CPU
DIVDER
Stop
CPUCLKC0
CPUCLKT (1:0)
SEL24_48#
PCI
DIVDER
PCICLK (4:0)
PCICLK_F
Control
Logic
SDATA
SCLK
FS (3:0)
Config.
Reg.
SDRAM
DRIVER
SDRAM (11:0)
SDRAM_OUT
PD#
CPU_STOP#
BUFFER IN
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
9248-114 Rev C 01/24/01
Third party brands and names are the property of their respective owners.
information being relied upon by the customer is current and accurate.