Integrated
Circuit
Systems, Inc.
ICS9248-168
AMD - K7™ Clock Generator for Mobile System
Recommended Application:
VIA KT133 style chipset
Pin Configuration
Output Features:
48
VDDREF
X1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
REF01
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
REF
1
•
•
•
•
•
•
•
1 - Differential pair open drain CPU clocks
1 - CPU clock @ 3.3V
7 - SDRAM @ 3.3V
8 - PCI @ 3.3V,
1 - 48MHz, @ 3.3V fixed.
1 - 24/48MHz @ 3.3V
X2
REF2
GND
GND
VDD
*FS2/PCICLK_F
*FS1/PCICLK0
VDDPCI
GND
PCICLK1
PCICLK2
PCICLK3
PCICLK4
PCICLK5
GND
VDDPCI
CPUCLK2
CPUCLKT02
CPUCLKC02
CPU_STOP#*
PD#*
3 - REF @ 3.3V, 14.318MHz.
SDRAM0
SDRAM1
VDDSDR
GND
SDRAM2
SDRAM3
GND
VDDSDR
SDRAM4
SDRAM5
SDRAM_F
SCLK
Features:
•
•
Up to 153MHz frequency support
PCICLK6
Support power management: CPU stop and Power down
Mode from I2C programming.
*SDRAM_STOP#
*PCI_STOP#
BUFFER_IN
AVDD
•
•
Spread spectrum for EMI control
(
ꢀ.25ꢁ to ꢀ.0ꢁ center, or ꢀ to -ꢀ.5ꢁ or -1.ꢀꢁ down
GND
GND
spread).
Uses external 14.318MHz crystal
*FS0/48MHZ
*SEL24_48#/24_48MHz
VDD48
SDATA
48-Pin 300mil SSOP
*
Internal Pull-up Resistor of 120K to VDD
1
These outputs have double strength to drive 2 loads.
These outputs can be set to 1.5X strength through I2C
2
Functionality
Block Diagram
FS2
0
FS1
0
FS0
0
CPU
PCI
33.33
33.33
Spread Percentage
+/- 0.35% Center Spread
+/- 0.35% Center Spread
PLL2
48MHz
100.00
133.33
100.00
133.33
100.00
133.33
90.00
24_48MHz
0
0
1
/ 2
0
1
0
33.33 0 to - 0.5% Down Spread
33.33 0 to - 0.5% Down Spread
REF (2:0)
CPUCLK
X1
X2
XTAL
OSC
0
1
1
1
0
0
33.33
33.33
30.00
30.00
+/- 0.6% Center Spread
+/- 0.6% Center Spread
+/- 0.25% Center Spread
+/- 0.25% Center Spread
PLL1
Spread
Spectrum
CPU
DIVDER
1
0
1
Stop
CPUCLKC0
CPUCLKT0
1
1
0
1
1
1
120.00
SEL24_48#
SDATA
PCI
DIVDER
Stop
Stop
PCICLK (6:0)
PCICLK_F
Control
Logic
SCLK
FS (2:0)
SDRAM
DRIVER
PD#
SDRAM (5:0)
SDRAM_F
CPU_STOP#
PCI_STOP#
SDRAM_STOP#
BUFFER_IN
Config.
Reg.
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
9248-168 Rev
B 01/09/01
Third party brands and names are the property of their respective owners.
information being relied upon by the customer is current and accurate.