ICS9248-163
Integrated
Circuit
Systems, Inc.
Preliminary Product Preview
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
CPUCLK
GND
CPUCLKC0
CPUCLKT0
VDDA
PD#*
SDRAM_OUT
GND
SDRAM0
SDRAM1
VDDSDR
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDDSDR
SDRAM6
SDRAM7
VDD48
•
•
•
•
•
•
•
1 - Differential pair open drain CPU clocks
1 - CPU clock @ 3.3V
13 - SDRAM @ 3.3V
6 - PCI @3.3V,
1 - 48MHz, @3.3V fixed.
1 - 24/48MHz @ 3.3V
X1
X2
VDD
*MODE/PCICLK_F
*FS3/PCICLK0
GND
*SEL24_48#/PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDDPCI
2 - REF @3.3V, 14.318MHz.
Features:
•
•
Up to 166MHz frequency support
BUFFER IN
GND
Support power management: CPU stop and Power down
Mode from I2C programming.
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
REF (1:0)
CPUCLK
95.00
X1
X2
XTAL
OSC
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
CPUCLKT0
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
PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.
9248-163 Rev A 9/22/00
Third party brands and names are the property of their respective owners.