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ICS950818YG-T Datasheet

  • ICS950818YG-T

  • Frequency Generator with 200MHz Differential CPU Clocks

  • 155.64KB

  • 20頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS950818
Frequency Generator with 200MHz Differential CPU Clocks
Recommended Application:
CK-408 clock for Brookdale/Odem/Montara-GM for P4/Banias
processor.
Output Features:
鈥?/div>
2 - Differential CPU Clock Pairs @ 3.3V
鈥?/div>
8 - PCI (3.3V) @ 33.3MHz including 2 1x/2x
selectable PCI clocks
鈥?/div>
3 - PCI_F/PCI selectable (3.3V) @ 33.3MHz
鈥?/div>
1 - USB (3.3V) @ 48MHz, 1 DOT (3.3V) @ 48MHz
鈥?/div>
1 - REF (3.3V) @ 14.318MHz
鈥?/div>
4 - 3V66 (3.3V) @ 66.6MHz
鈥?/div>
1 - VCH/3V66 (3.3V) @ 48MHz or 66.6MHz
Features:
鈥?/div>
Selectable 1X or 2X strength for REF and PCI via
SMBus interface
鈥?/div>
Programmable group to group skew
鈥?/div>
Linear programmable frequency and spreading %
鈥?/div>
Efficient power management scheme through PD#,
CPU_STOP# and PCI_STOP#.
鈥?/div>
Uses external 14.318MHz crystal
鈥?/div>
Stop clocks and functional control available through
SMBus interface.
Key Specifications:
鈥?/div>
CPU Output Jitter <150ps
鈥?/div>
3V66 Output Jitter <250ps
鈥?/div>
CPU Output Skew <100ps
Pin Configuration
X1
X2
GND
PCICLK_F0/PCICLK6
PCICLK_F1/PCICLK7
PCICLK_F2/PCICLK8
GND
PCICLK0
PCICLK1
*PCICLK2
VDDPCI
*PCICLK3
PCICLK4
PCICLK5
VDD3V66
GND
3V66_2
3V66_3
3V66_4
PCICLK9
PD#
VDDA
GND
Vtt_PWRGD#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
REF
FS1
CPU_STOP#
VDDCPU
CPUCLKT0
CPUCLKC0
GND
VDDCPU
CPUCLKT1
CPUCLKC1
IREF
FS0
48MHz_USB
48MHz_DOT
VDD48
GND
3V66_1/VCH_CLK
PCI_STOP#
PCICLK10
VDD3V66
GND
SCLK
SDATA
48-Pin 6.10 mm. Body, 0.50 mm. pitch TSSOP
*These outputs have selectable 1X/2X strength via SMBus
Block Diagram
PLL2
48MHz_USB
48MHz_DOT
X1
X2
XTAL
OSC
3V66 (4:2)
Frequency Select Table 1
Freq
Sel
FS FS
1
0
0
0
1
1
0
1
0
1
CPU MHz
3V66(4:1)
MHz
66.66
66.66
66.66
66.66
PCI MHz
REF MHz
USB/DOT
MHz
48.008
48.008
48.008
48.008
PLL1
Spread
Spectrum
REF
CPU
DIVDER
Stop
3
3
100.00
166.67
133.33
200.00
33.33
33.33
33.33
33.33
ICS950818
14.318
14.318
14.318
14.318
CPUCLKT (1:0)
CPUCLKC (1:0)
PCICLK (10:0)
Vtt_PWRGD#
PD#
CPU_STOP#
PCI_STOP#
FS (1:0)
SDATA
SCLK
Control
Logic
PCI
DIVDER
3V66
DIVDER
Stop
7
PCICLK_F (2:0)
3
Config.
Reg.
3V66_1/VCH_CLK
I REF
0825F鈥?1/19/03

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