System Clock
Description
ICS950405
AMD - K8™ System Clock Chip
Recommended Application: AMD K8 System Clock with AMD, VIA or ALI Chipset
Output Features: • 2 - Differential pair push-pull CPU clocks @
3.
3V • 9 - PCICLK (Including 1 free running) @ 3.
3V • 3 - Selectable PCICLK/HTTCLK @ 3.
3V • 1 - HTTCLK @ 3.
3V • 1 - 48MHz @ 3.
3V fixed.
• 1 - 24/48MHz @ 3.
3V • 3 - REF @ 3.
3V, 14.
318MHz.
Features: • Programmable output frequency.
• Programmable output divider ratios.
• Programmable output rise/fall time.
• Programmable output skew.
• Programmable spread percentage for EMI control.
• Watchdog timer technology and RESET# output to
reset system if system malfunctions.
• Programmable watch dog safe frequency.
• Support I2C Index read/write and block read/write operations.
• Uses external 14.
318MHz crystal.
• Supports Hyper Transport Technology (HTTCLK).
Functionality
FS3 FS2 FS1 FS0
CPU MHz
HTT MHz
0
0
0
0 100.
90 67.
27
0
0
0
1 133.
90 66.
95
0
0
1
0 168.
00 67.
20
0
0
1
1 202.
00 67.
33
0
1
0
0 100.
20 66.
80
0
1
0
1 133.
50 66.
75
0
1
1
0 166.
70 66.
68
0
1
1
1 200.
40 66.
80
1
0
0
0 150.
00 60.
00
1
0
0
1 180.
00 60.
00
1
0
1
0 210.
00 70.
00
1
0
1
1 240.
00 60.
00
1
1
0
0 270.
00 67.
50
1
1
0
1 233.
33 66.
67
1
1
1
0 266.
67 66.
67
1
1
1
1 300.
00 75.
00
PCI
MHz 33.
63 33.
48 33.
60 33.
67 33.
40 33.
38 33.
34 33.
40 30.
00 30.
00 35.
00 30.
00 33.
75 33.
33 33.
33 37.
50
Pin Configuration
*FS0/REF0 1 VDDHTT 2 X1 3 X2 4 GND 5
*ModeA/HTTCLK0 6 *ModeB/PCICLK8/HTTCLK1 7
PCICLK9/HTTCLK2 8 VDDPCI 9 GND 10
PCICLK11/HTTCLK3 11 PCICLK10 12 PCICLK0 13 PCICLK1 14 GND 15 VDDPCI 16 PCICLK2 17 PCICLK3 18 VDDPCI 19 GND 20 2XPCICLK4 21 2XPCICLK5 22 2XPCICLK6 23 2XPCICLK7 24
ICS950405
48 REF1/FS1* 47 GND 46 VDDREF 45 REF2/FS2* 44 Reset# 43 VDDA 42 GND 41 CPUCLK8T0 40 CPUCLK8C0 39 GND 38 VDDCPU 37 CPUCLK8T1 36 CPUCLK8C1 35 VDDCPU 34 GND 33 GND 32 PD#* 31 48MHz/FS3** 30 GND 29 AVDD48 28 24_48MHz/Sel24_48#* 27 GND 26 SDATA 25 SCLK
48-SSOP
* Internal Pull-Up Resistor 2X This Output ...
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