Integrated
Circuit
Systems, Inc.
ICS9248-141
AMD - K7™ System Clock Chip
Recommended Application:
VIA KX133 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
VDDREF
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
VDDPCI
GND
CPUCLKC0
CPUCLKT0
VDDA
PD#*
SDRAM_OUT
GND
SDRAM0
SDRAM1
VDDSDR
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDDSDR
SDRAM6
SDRAM7
VDD48
*MODE/PCICLK_F
*FS3/PCICLK0
GND
1 - 24/48MHz @ 3.3V
2 - REF @3.3V, 14.318MHz.
*SEL24_48#/PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDDPCI
Features:
•
•
Up to 166MHz frequency support
BUFFER IN
Support power management: CPU stop and Power down
Mode from I2C programming.
GND
SDRAM11
SDRAM10
VDDSDR
SDRAM9
SDRAM8
GND
•
•
Spread spectrum for EMI control
(
ꢀ.2ꢁ5 center spreadꢂ.
Uses external 14.318MHz crystal
SDATA
SCLK
48MHz/FS0*
24/48MHz/FS1*
48-Pin 300mil SSOP
*
Internal Pull-up Resistor of 120K to VDD
Functionality
Block Diagram
CPU
(MHz)
90.00
PCICLK
(MHz)
30.00
31.67
33.67
34.00
33.57
34.33
35.00
33.33
35.67
36.33
36.67
37.00
37.67
38.33
39.00
33.33
PLL2
48MHz
FS3
FS2
FS1
FS0
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
95.00
X1
X2
XTAL
OSC
REF (1:0)
101.00
102.00
100.90
103.00
105.00
100.00
107.00
109.00
110.00
111.00
113.00
115.00
117.00
133.30
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 information being relied upon by the customer is
9248-141 Rev B 01/18/01
Third party brands and names are the property of their respective owners.